Dodge Differential Driveline SRM 2006 Service Manual

DR DIFFERENTIAL & DRIVELINE 3 - 1

DIFFERENTIAL & DRIVELINE

TABLE OF CONTENTS

page page

DIFFERENTIAL & DRIVELINE - ELECTRICAL

DIAGNOSTICS ........................... 1

DIFFERENTIAL & DRIVELINE - SERVICE

INFORMATION......................... 113

DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS

TABLE OF CONTENTS

page page

DIFFERENTIAL & DRIVELINE - ELECTRICAL

DIAGNOSTICS

DIAGNOSIS AND TESTING

C143A - DIFFERENTIAL/LOCKER SELECT

SWITCH PERFORMANCE.....................3

C143B-DIFFERENTIAL/LOCKER SELECT

SWITCH CIRCUIT LOW.......................7

C143C-DIFFERENTIAL/LOCKER SELECT

SWITCH CIRCUIT HIGH.....................11

C1417–FRONT DIFFERENTIAL CONTROL

CIRCUIT LOW..............................15

C1418–FRONT DIFFERENTIAL CONTROL

CIRCUIT HIGH..............................19

C1419–FRONT DIFFERENTIAL CONTROL

CIRCUIT OPEN.............................23

C141D-REAR DIFFERENTIAL CONTROL

CIRCUIT LOW..............................26

C141E–REAR DIFFERENTIAL CONTROL

CIRCUIT HIGH..............................30

C141F–REAR DIFFERENTIAL CONTROL

CIRCUIT OPEN.............................34

C1446-FRONT DIFFERENTIAL RETURN

CIRCUIT LOW..............................37

C1447-FRONT DIFFERENTIAL RETURN

CIRCUIT HIGH..............................40

C144A-REAR DIFFERENTIAL RETURN

CIRCUIT LOW..............................44

C144B-REAR DIFFERENTIAL RETURN

CIRCUIT HIGH..............................47

C144E-FRONT DIFFERENTIAL POSITION

SENSOR PERFORMANCE...................51

C1450-FRONT DIFFERENTIAL POSITION

SENSOR CIRCUIT HIGH.....................55

C144F-FRONT DIFFERENTIAL POSITION

SENSOR LOW..............................59

C1452-REAR DIFFERENTIAL POSITION

SENSOR PERFORMANCE...................62

C1453-REAR DIFFERENTIAL POSITION

SENSOR LOW..............................66

C1454-REAR DIFFERENTIAL POSITION

SENSOR CIRCUIT HIGH.....................69

C2100–BATTERY VOLTAGE LOW ............73

C2101–BATTERY VOLTAGE HIGH ............76

C2111-SENSOR SUPPLY 1 VOLTAGE

CIRCUIT LOW..............................79

C2112-SENSOR SUPPLY 1 VOLTAGE

CIRCUIT HIGH..............................82

C2126-SENSOR SUPPLY 2 VOLTAGE

CIRCUIT LOW..............................85

C2127-SENSOR SUPPLY 2 VOLTAGE

CIRCUIT HIGH..............................88

C230F-LOCKER/DIFFERENTIAL INDICATOR

SUPPLY CIRCUIT PREFORMANCE...........91

C2310-STABILIZER/DIFFERENTIAL

INDICATOR SUPPLY CIRCUIT LOW..........95

C2311-STABILIZER/DIFFERENTIAL

INDICATOR SUPPLY CIRCUIT HIGH..........99

C2324-STABILIZER BAR INDICATOR

CONTROL CIRCUIT........................104

U0100-LOST COMMUNICATION WITH

ECM/PCM (FDCM).........................109

U0155-NO CLUSTER BUS MESSAGE ........111

3 - 2 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS

DIAGNOSIS AND TESTING

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 3

C143A - DIFFERENTIAL/LOCKER SELECT SWITCH PERFORMANCE

For a complete wiring diagram Refer to Section 8W

3 - 4 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch resistance is out of specification.

Possible Causes

SWITCH INTERMITTENT DISCONNECTING STABILIZER BAR SWITCH (T537) LOCKER SWITCH SUPPLY CIRCUIT (T535) LOCKER SWITCH SENSE CIRCUIT OPEN/HIGH RESISTANCE FDCM

DTC ACTIVE

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s).

Is the DTC active at this time?

Yes >> No >>

DISCONNECTING STABILIZER BAR SWITCH OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Disconnecting Stabilizer Bar Switch harness connector. Remove the Disconnecting Stabilizer Bar Switch. Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Locker Switch Supply terminal and

the Locker Switch Sense terminal. The resistance must read as follows for each position of the switch.

• UNLOCK: 5454 ohms +/- 5%

• RR: 1940 ohms +/- 5%

• FR/RR: 1075 ohms +/- 5%

Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch

Yes >> No >>

Go To 2 Go To 5

Go To 3 Replace the Disconnecting Stabilizer Bar Switch.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 5

(T535) LOCKER SWITCH SENSE CIRCUIT OPEN

3.

Disconnect the FDCM harness connector. Measure the resistance of the (T535) Locker Switch Sense circuit

between the Disconnecting Stabilizer Bar Switch and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

(T537) LOCKER SWITCH SUPPLY CIRCUIT OPEN

4.

Measure the resistance of the (T537) Locker Switch Supply circuit between the Disconnecting Stabilizer Bar Switch and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >>

No >>

Go To 4 Repair the open or high resistance in the (T535) Locker

Switch Sense circuit. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Replace the FDCM in accordance with the Service Information

Perform FDCM VERIFICATION TEST. Repair the open or high resistance in the (T537) Locker

Switch Supply circuit. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 6 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset. While monitoring the TRAC State on the scan tool, move the switch to each position. The scan tool display must

match the position on the actual switch.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 7

C143B-DIFFERENTIAL/LOCKER SELECT SWITCH CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

3 - 8 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch sense is below 0.25 volt.

Possible Causes

SWITCH INTERMITTENT DISCONNECTING STABILIZER BAR SWITCH (T537) LOCKER SWITCH SUPPLY CIRCUIT SHORTED TO GROUND (T535) LOCKER SWITCH SENSE CIRCUIT SHORT TO GROUND FDCM

DTC ACTIVE

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s).

Is the DTC active at this time?

Yes >> No >>

DISCONNECTING STABILIZER BAR SWITCH OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Disconnecting Stabilizer Bar Switch harness connector. Remove the Disconnecting Stabilizer Bar Switch. Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Locker Switch Supply terminal and

the Locker Switch Sense terminal. The resistance must read as follows for each position of the switch.

• UNLOCK: 5454 ohms +/- 5%

• RR: 1940 ohms +/- 5%

• FR/RR: 1075 ohms +/- 5%

Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch

Yes >> No >>

Go To 2 Go To 5

Go To 3 Replace the Disconnecting Stabilizer Bar Switch.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 9

(T535) LOCKER SWITCH SENSE CIRCUIT SHORTED TO GROUND

3.

Disconnect the FDCM harness connector. Measure the resistance of the (T535) Locker Switch Sense circuit in the

Disconnecting Stabilizer Bar Switch harness connector to ground.

Is the resistance below 100 ohms?

Yes >>

No >>

(T537) LOCKER SWITCH SUPPLY CIRCUIT SHORT TO GROUND

4.

Measure the resistance of the (T537) Locker Switch Supply circuit in the Disconnecting Stabilizer Bar Switch harness connector to ground.

Is the resistance below 100 ohms?

Yes >>

No >>

Repair the short to ground in the (T535) Locker Switch Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair the short to ground in the (T537) Locker Switch Supply circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Replace the FDCM in accordance with the Service Information

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 10 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset. While monitoring the TRAC State on the scan tool, move the switch to each position. The scan tool display must

match the position on the actual switch.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 11

C143C-DIFFERENTIAL/LOCKER SELECT SWITCH CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

3 - 12 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch Sense circuit is above 4.5 volts.

Possible Causes

SWITCH INTERMITTENT DISCONNECTING STABILIZER SWTICH (T535) LOCKER SWITCH SENSE CIRCUIT SHORT TO VOLTAGE (T537) LOCKER SWITCH SUPPLY CIRCUIT SHORTED TO (T535) LOCKER SWITCH SENSE CIRCUIT (T535) LOCKER SWITCH SENSE CIRCUIT OPEN FDCM

DTC ACTIVE

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s).

Is the DTC active at this time?

Yes >> No >>

DISCONNECTING STABILIZER SWTICH OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Disconnecting Stabilizer Bar Switch harness connector. Remove the Disconnecting Stabilizer Bar Switch. Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Locker Switch Supply terminal and

the Locker Switch Sense terminal. The resistance must read as follows for each position of the switch.

• UNLOCK: 5454 ohms +/- 5%

• RR: 1940 ohms +/- 5%

• FR/RR: 1075 ohms +/- 5%

Does the ohmmeter read correctly for each position of the Disconnecting Stabilizer Bar Switch

Yes >> No >>

Go To 2 Go To 6

Go To 3 Replace the Disconnecting Stabilizer Bar Switch.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 13

(T535) LOCKER SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE

3.

Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T535) Locker Switch Sense circuit in the

Disconnecting Stabilizer Bar Switch harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

(T537) LOCKER SWITCH SUPPLY CIRCUIT SHORTED TO (T535) LOCKER SWITCH SENSE CIRCUIT

4.

Measure the resistance between (T537) Locker Switch Supply circuit and the (T535) Locker Switch Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector.

Is the resistance below 5.0 ohms?

Yes >>

No >>

Repair the short to voltage in the (T535) Locker Switch Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair the short between (T537) Locker Switch Supply circuit and the (T535) Locker Switch Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 5

3 - 14 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T535) LOCKER SWITCH SENSE CIRCUIT OPEN

5.

Measure the resistance of the (T535) Locker Switch Sense circuit between the Disconnecting Stabilizer Bar Switch and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >>

No >>

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset. While monitoring the TRAC State on the scan tool, move the switch to each position. The scan tool display must

match the position on the actual switch.

Were there any problems found?

Replace the FDCM in accordance with the Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Repair the open in the (T535) Locker Switch Sense circuit. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 15

C1417–FRONT DIFFERENTIAL CONTROL CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

3 - 16 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects the Front Locker Source circuit is shorted low.

Possible Causes

FRONT LOCKER SOLENOID (T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO GROUND (T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO FRONT LOCKER RETURN CIRCUIT FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker

Return circuit in the Front Locker harness connector. With the scan tool, actuate the Front Locker Solenoid.

Does the test light illuminate and flash on and off?

Yes >>

No >>

Go To 2 Go To 6

Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 17

(T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T520) Front Locker Source circuit at the

FDCM harness connector to ground.

Is the resistance below 100 ohms?

Yes >>

No >>

(T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO (T524) FRONT LOCKER RETURN CIRCUIT

4.

Measure the resistance between the (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit in the FDCM harness connector.

Is the resistance below 100 ohms?

Yes >>

No >>

Repair the short to ground in the Front Locker Source circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair the short between (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 5

3 - 18 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 19

C1418–FRONT DIFFERENTIAL CONTROL CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

3 - 20 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch the FR/RR position.

• Set Condition:

The FDCM detects the Front Locker Source circuit is shorted high.

Possible Causes

FRONT LOCKER SOLENOID (T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO BATTERY VOLTAGE (T524) FRONT LOCKER RETURN CIRCUIT OPEN FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker

Return circuit in the Front Locker harness connector. With a scan tool, actuate the Front Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 6

Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 21

(T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO BATTERY VOLTAGE

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T520) Front Locker Source circuit at the

FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

(T524) FRONT LOCKER RETURN CIRCUIT OPEN

4.

Measure the resistance of the (T524) Front Locker Return circuit form the in the Front Locker Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

Repair the short to voltage in the (T520) Front Locker Source circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Go To 5 Repair the open in the (T524) Front Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 22 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST

Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 23

C1419–FRONT DIFFERENTIAL CONTROL CIRCUIT OPEN

For a complete wiring diagram Refer to Section 8W.

3 - 24 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects the Front Locker Source circuit is open.

Possible Causes

FRONT LOCKER SOLENOID (T520) FRONT LOCKER SOURCE CIRCUIT OPEN FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker

Return circuit in the Front Locker harness connector. With a scan tool, actuate the Front Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 5

Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 25

(T520) FRONT LOCKER SOURCE CIRCUIT OPEN

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the resistance of the (T520) Front Locker Source circuit from

the FDCM harness connector and the Front Locker Solenoid harness connector.

Is the resistances below 5.0 ohms?

Yes >> No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Go To 4 Repair the open in the Front Locker Source circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 26 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C141D-REAR DIFFERENTIAL CONTROL CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 27

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the RR or FR/RR position.

• Set Condition:

The FDCM detects the Rear Locker Source circuit is shorted low.

Possible Causes

REAR LOCKER SOLENOID (T526) REAR LOCKER SOURCE CIRCUIT SHORTED TO GROUND (T528) REAR LOCKER SOURCE CIRCUIT SHORTED TO (T528) REAR LOCKER RETURN CIRCUIT FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T526) Rear Locker Source circuit and the (T528) Rear Locker

Return circuit in the Rear Locker harness connector. With a scan tool, actuate the Rear Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 6

Inspect the Rear Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Rear Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

3 - 28 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T526) REAR LOCKER SOURCE CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T526) Rear Locker Source circuit at the

FDCM harness connector to ground.

Is the resistance below 100 ohms?

Yes >>

No >>

(T526) REAR LOCKER SOURCE CIRCUIT SHORTED TO (T528) REAR LOCKER RETURN CIRCUIT

4.

Measure the resistance between the (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit in the FDCM harness connector.

Is the resistance below 100 ohms?

Yes >>

No >>

Repair the short to ground in the Rear Locker Source circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair the short between (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 5

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 29

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 30 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C141E–REAR DIFFERENTIAL CONTROL CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 31

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects the Rear Locker Source circuit is shorted high.

Possible Causes

REAR LOCKER SOLENOID (T526) REAR LOCKER SOURCE CIRCUIT SHORTED TO BATTERY VOLTAGE (T528) REAR LOCKER RETURN CIRCUIT OPEN FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T526) Rear Locker Source circuit and the (T528) Rear Locker

Return circuit in the Rear Locker harness connector. With a scan tool, actuate the Rear Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 6

Inspect the Rear Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Rear Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

3 - 32 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T526) REAR LOCKER SOURCE CIRCUIT SHORTED TO BATTERY VOLTAGE

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T526) Rear Locker Source circuit at the

FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

(T528) REAR LOCKER RETURN CIRCUIT OPEN

4.

Measure the resistance of the (T528) Rear Locker Return circuit form the in the Rear Locker Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

Repair the short to voltage in the (T526) Rear Locker Source circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Go To 5 Repair the open in the (T528) Rear Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 33

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST

Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 34 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C141F–REAR DIFFERENTIAL CONTROL CIRCUIT OPEN

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 35

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects the Rear Locker Source circuit is open.

Possible Causes

REAR LOCKER SOLENOID (T526) REAR LOCKER SOURCE CIRCUIT OPEN FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T526) Rear Locker Source circuit and the (T528) Rear Locker

Return circuit in the Rear Locker harness connector. With a scan tool, actuate the Rear Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 5

Inspect the Rear Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Rear Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

3 - 36 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T526) REAR LOCKER SOURCE CIRCUIT OPEN

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the resistance of the (T526) Rear Locker Source circuit from

the FDCM harness connector and the Rear Locker Solenoid harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Go To 4 Repair the open in the Rear Locker Source circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 37

C1446-FRONT DIFFERENTIAL RETURN CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

3 - 38 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects the Front Locker Source circuit is shorted low.

Possible Causes

FRONT LOCKER SOLENOID (T526) FRONT LOCKER RETURN CIRCUIT SHORTED TO GROUND FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker

Return circuit in the Front Locker harness connector. With a scan tool, actuate the Front Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 5

Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 39

(T524) FRONT LOCKER RETURN CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T524) Front Locker Return circuit in the

FDCM harness connector to ground.

Is the resistance below 100 ohms?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to ground in (T524) Front Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 40 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C1447-FRONT DIFFERENTIAL RETURN CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 41

• When Monitored:

Ignition on. Disconnection Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects the Front Locker Source circuit is shorted low.

Possible Causes

FRONT LOCKER SOLENOID (T520) FRONT LOCKER SOURCE CIRCUIT SHORTED TO GROUND (T524) FRONT LOCKER RETURN CIRCUIT SHORTED TO (T520) FRONT LOCKER SOURCE CIRCUIT FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With thescan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T520) Front Locker Source circuit and the (T524) Front Locker

Return circuit in the Front Locker harness connector. With ascan tool, actuate the Front Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 6

Inspect the Front Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Front Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

3 - 42 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T524) FRONT LOCKER RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T524) Front Locker Return circuit at the

FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

(T524) FRONT LOCKER RETURN CIRCUIT SHORTED TO (T520) FRONT LOCKER SOURCE CIRCUIT

4.

Turn the ignition off. Measure the resistance between the (T520) Front Locker Source circuit

and the (T524) Front Locker Return circuit in the FDCM harness connector.

Is the resistance below 100 ohms?

Yes >>

No >>

Repair the short to voltage in the (T524) Front Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair the short between (T520) Front Locker Source circuit and the (T524) Front Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 5

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 43

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST

Replace and program the Final Drive Control Module in accordance with Service Information. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 44 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C144A-REAR DIFFERENTIAL RETURN CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 45

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the RR or FR/RR position.

• Set Condition:

The FDCM detects the Rear Locker Source circuit is shorted low.

Possible Causes

REAR LOCKER SOLENOID (T528) REAR LOCKER RETURN CIRCUIT SHORTED TO GROUND FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T526) Rear Locker Source circuit and the (T528) Rear Locker

Return circuit in the Rear Locker harness connector. With a scan tool, actuate the Rear Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 5

Inspect the Rear Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Rear Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

3 - 46 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T528) REAR LOCKER RETURN CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T528) Rear Locker Return circuit in the

FDCM harness connector to ground.

Is the resistance below 100 ohms?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to ground in (T528) Rear Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 47

C144B-REAR DIFFERENTIAL RETURN CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

3 - 48 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the RR or FR/RR position.

• Set Condition:

The FDCM detects the Rear Locker Source circuit is shorted low.

Possible Causes

REAR LOCKER SOLENOID (T526) REAR LOCKER SOURCE CIRCUIT SHORTED TO GROUND (T528) REAR LOCKER RETURN CIRCUIT SHORTED TO (T526) REAR LOCKER SOURCE CIRCUIT FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR LOCKER SOLENOID OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Ignition on, engine not running. Using a 12-volt test light, jump across from the (T526) Rear Locker Source circuit and the (T528) Rear Locker

Return circuit in the Rear Locker harness connector. With a scan tool, actuate the Rear Locker Solenoid.

Does the test light flash on and off?

Yes >>

No >>

Go To 2 Go To 6

Inspect the Rear Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. If OK, replace the Rear Locker Solenoid.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 49

(T528) REAR LOCKER RETURN CIRCUIT SHORTED TO BATTERY VOLTAGE

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T528) Rear Locker Return circuit at the

FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

(T528) REAR LOCKER RETURN CIRCUIT SHORTED TO (T526) REAR LOCKER SOURCE CIRCUIT

4.

Turn the ignition off. Measure the resistance between the (T526) Rear Locker Source circuit

and the (T528) Rear Locker Return circuit in the FDCM harness connector.

Is the resistance below 100 ohms?

Yes >>

No >>

Repair the short to voltage in the (T528) Rear Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair the short between (T526) Rear Locker Source circuit and the (T528) Rear Locker Return circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 5

3 - 50 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 51

C144E-FRONT DIFFERENTIAL POSITION SENSOR PERFORMANCE

For a complete wiring diagram Refer to Section 8W.

3 - 52 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

The ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects that the Front Differential Position Sensor is in an unexpected state.

Possible Causes

(T522) FRONT DIFFERENTIAL POSITION SENSOR (WIRING, CONNECTOR AND/OR TERMINAL CONDITION) FRONT DIFFERENTIAL POSITION SENSOR (T522) FRONT LOCKER SENSOR SENSE OPEN FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT DIFFERENTIAL POSITION SENSOR WIRING

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Using the scan tool, actuate the Front Locker Solenoid. Monitor the Front Differential Position Sensor State. Wiggle the related wiring harness from the FDCM to the Front Locker Solenoid connector at the axle. With a scan tool, actuate the Front Locker Solenoid.

Does the state on the scan tool change while wiggling the wiring harness?

Yes >>

No >>

Go To 2 Go To 6

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Check the Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. Repair as necessary.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 53

FRONT DIFFERENTIAL POSITION SENSOR OPERATION

3.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sen-

sor Supply circuit in the Front Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T522) Front Locker Sensor

Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds.

Does the state change on the scan tool while tapping the terminal?

Yes >>

No >>

(T522) FRONT LOCKER SENSOR SENSE CIRCUIT OPEN

4.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T522) Front Locker Sensor Sense circuit

between the Front Locker Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Go To 4

Go To 5 Repair the open in the Front Locker Sensor Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 54 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 55

C1450-FRONT DIFFERENTIAL POSITION SENSOR CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

3 - 56 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects that the Front Differential Position Sensor is shorted to voltage.

Possible Causes

(T522) FRONT LOCKER SENSOR SENSE SHORTED TO BATTERY VOLTAGE FRONT DIFFERENTIAL POSITION SENSOR (T522) FRONT LOCKER SENSOR SENSE OPEN (T522) FRONT LOCKER SENSOR SENSE SHORTED TO (T521) LOCKER SENSOR SUPPLY FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

(T522) FRONT LOCKER SENSOR SENSE SHORTED TO BATTERY VOLTAGE

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T522) Front Locker Sensor Sense circuit in

the FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

Go To 2 Go To 7

Repair the short to voltage in the (T522) Front Locker Sensor Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 57

FRONT DIFFERENTIAL POSITION SENSOR OPERATION

3.

Turn the ignition off. Connect the FDCM harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sen-

sor Supply circuit in the Front Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T522) Front Locker Sensor

Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds.

Does the state change on the scan tool while tapping the terminal?

Yes >>

No >>

(T522) FRONT LOCKER SENSOR SENSE CIRCUIT OPEN

4.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T522) Front Locker Sensor Sense circuit

between the Front Locker Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Go To 4

Go To 5 Repair the open in the (T522) Front Locker Sensor Sense

circuit. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 58 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T522) FRONT LOCKER SENSOR SENSE CIRCUIT SHORTED TO (T521) LOCKER SENSOR 1 SUPPLY

5.

Measure the resistance between the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sensor 1 Supply circuit in the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >>

No >>

FDCM

6.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short between the (T522) Front Locker Sensor Sense circuit and the (T521) Locker Sensor 1 Supply circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 6

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

7.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 59

C144F-FRONT DIFFERENTIAL POSITION SENSOR LOW

For a complete wiring diagram Refer to Section 8W.

3 - 60 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects that the Front Differential Position Sensor is short low.

Possible Causes

FRONT DIFFERENTIAL POSITION SENSOR (T522) FRONT LOCKER SENSOR SENSE SHORTED TO GROUND FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT DIFFERENTIAL POSITION SENSOR OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Using the scan tool, ignition on, monitor the Front Locker Sensor state. Disconnect the Front Locker Solenoid harness connector.

Does the state change on the scan tool from Locked to Unlocked?

Yes >>

No >>

Go To 2 Go To 5

Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 61

(T522) FRONT LOCKER SENSOR SENSE CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T522) Front Locker Sensor Sense circuit

in the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to ground in the (T522) Front Locker Sensor Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 62 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C1452-REAR DIFFERENTIAL POSITION SENSOR PERFORMANCE

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 63

• When Monitored:

The ignition on. Disconnecting Stabilizer Bar Switch in the RR or FR/RR position.

• Set Condition:

The FDCM detects that the Rear Differential Position Sensor is in an unexpected state.

Possible Causes

REAR DIFFERENTIAL POSITION SENSOR (WIRING, CONNECTOR AND/OR TERMINAL CONDITION) REAR DIFFERENTIAL POSITION SENSOR REAR LOCKER SENSOR SENSE OPEN FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR DIFFERENTIAL POSITION SENSOR WIRING

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Using the scan tool, actuate the Rear Locker Solenoid. Monitor the Rear Differential Position Sensor State. Wiggle the related wiring harness from the FDCM to the Rear Locker Solenoid connector at the axle. With a scan tool, actuate the Rear Locker Solenoid.

Does the state on the scan tool change while wiggling the wiring harness?

Yes >>

No >>

Go To 2 Go To 6

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Check the Locker Solenoid terminals and connectors for corrosion and/or dirt that may compromise the connection. Repair as necessary.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

3 - 64 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

REAR DIFFERENTIAL POSITION SENSOR OPERATION

3.

Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T527) Rear Locker Sensor Sense circuit and the (T521) Locker Sen-

sor Supply circuit in the Rear Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T527) Rear Locker Sensor

Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds.

Does the state change on the scan tool while tapping the terminal?

Yes >>

No >>

(T527) REAR LOCKER SENSOR SENSE CIRCUIT OPEN

4.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T527) Rear Locker Sensor Sense circuit

between the Rear Locker Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Go To 4

Go To 5 Repair the open in the Rear Locker Sensor Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

FDCM

5.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 65

INTERMITTENT WIRING AND CONNECTORS

6.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 66 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C1453-REAR DIFFERENTIAL POSITION SENSOR LOW

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 67

• When Monitored:

The ignition on. Disconnecting Stabilizer Bar Switch in the FR/RR position.

• Set Condition:

The FDCM detects that the Rear Differential Position Sensor is short low.

Possible Causes

FRONT DIFFERENTIAL POSITION SENSOR (522) FRONT LOCKER SENSOR SENSE SHORTED TO GROUND FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR DIFFERENTIAL POSITION SENSOR OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Using the scan tool, ignition on, monitor the Rear Locker Sensor state. Disconnect the Rear Locker Solenoid harness connector.

Does the state change on the scan tool from Locked to Unlocked?

Yes >>

No >>

Go To 2 Go To 5

Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Go To 3

3 - 68 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T527) REAR LOCKER SENSOR SENSE CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T527) Rear Locker Sensor Sense circuit

in the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to ground in the Rear Locker Sensor Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 69

C1454-REAR DIFFERENTIAL POSITION SENSOR CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

3 - 70 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

The ignition on. Disconnecting Stabilizer Bar Switch in the RR or FR/RR position.

• Set Condition:

The FDCM detects that the Rear Differential Position Sensor is shorted to voltage.

Possible Causes

(T527) REAR LOCKER SENSOR SENSE SHORTED TO BATTERY VOLTAGE REAR DIFFERENTIAL POSITION SENSOR (T527) REAR LOCKER SENSOR SENSE OPEN (T527) REAR LOCKER SENSOR SENSE SHORTED TO (T521) LOCKER SENSOR SUPPLY FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

(T527) REAR LOCKER SENSOR SENSE SHORTED TO BATTERY VOLTAGE

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Rear Locker Solenoid harness connector. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage on the (T527) Rear Locker Sensor Sense circuit in

the FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

Go To 2 Go To 7

Repair the short to voltage in the (T527) Rear Locker Sensor Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 71

REAR DIFFERENTIAL POSITION SENSOR OPERATION

3.

Turn the ignition off. Connect the FDCM harness connector. Ignition on, engine not running. Using a jumper wire, jumper across from the (T527) Rear Locker Sensor Sense circuit and the (T521) Locker Sen-

sor Supply circuit in the Rear Locker Solenoid harness connector. While monitoring the sensor state on the scan tool, tap the jumper wire on and off the (T527) Rear Locker Sensor

Sense circuit terminal. Hold the jumper wire on and off the terminal for a minimum of 3 seconds.

Does the state change on the scan tool while tapping the terminal?

Yes >>

No >>

(T527) REAR LOCKER SENSOR SENSE CIRCUIT OPEN

4.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T527) Rear Locker Sensor Sense circuit

between the Rear Locker Solenoid harness connector and the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >> No >>

Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Go To 4

Go To 5 Repair the open in the Rear Locker Sensor Sense circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 72 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T527) REAR LOCKER SENSOR SENSE CIRCUIT SHORTED TO (T523) LOCKER SENSOR 2 SUPPLY

5.

Measure the resistance between the (T527) Rear Locker Sensor Sense circuit and the (T523) Locker Sensor 2 Supply circuit in the FDCM harness connector.

Is the resistance below 5.0 ohms?

Yes >>

No >>

FDCM

6.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short between the (T527) Rear Locker Sensor Sense circuit and the (T523) Locker Sensor 2 Supply circuit.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 6

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

7.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 73

C2100–BATTERY VOLTAGE LOW

For a complete wiring diagram Refer to Section 8W

3 - 74 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Continuously.

• Set Condition:

The Final Drive Control Module detects that system voltage is below 9.0 volts for 60 seconds.

Possible Causes

INTERMITTENT BATTERY VOLTAGE LOW CHARGING SYSTEM DTCS PRESENT FINAL DRIVE CONTROL MODULE POWER CIRCUITS OPEN OR HIGH RESISTANCE FINAL DRIVE CONTROL MODULE

Diagnostic Test

CHARGING SYSTEM DTCS PRESENT

1.

Ignition on. With the scan tool, select View DTCs in the Powertrain Control Module.

Are there any Charging System or related voltage DTCs present?

Yes >>

No >>

DTC IS ACTIVE

2.

With the scan tool, select View DTCs in the Final Drive Control Module.

Is the status Active for this DTC?

Yes >> No >>

(A34) FUSED B+ CIRCUIT OPEN OR HIGH RESISTANCE

3.

Turn the ignition off. Disconnect the Final Drive Control Module harness connector. Turn the ignition on. With a 12–volt test light connected to ground, check the (A34) Fused

B+ circuit in the Final Drive Control Module harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Refer to the symptom list and perform any Charging System DTC diagnostic procedures before continuing with this test.

Go to 2

Go to 3 Go to 5

Yes >> No >>

Go to 4 Repair the (A34) Fused B+ circuit for an open circuit or high

resistance. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 75

FINAL DRIVE CONTROL MODULE

4.

View repair.

Repair

Replace the Final Drive Control Module in accordance with the Service information. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test complete.

3 - 76 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C2101–BATTERY VOLTAGE HIGH

For a complete wiring diagram Refer to Section 8W

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 77

• When Monitored:

Continuously.

• Set Condition:

The Final Drive Control Module detects that system voltage is above 16.0 volts for 10 seconds with engine RPM greater than 350.

Possible Causes

INTERMITTENT BATTERY VOLTAGE HIGH CHARGING SYSTEM DTCS PRESENT FINAL DRIVE CONTROL MODULE GROUND CIRCUITS OPEN OR HIGH RESISTANCE FINAL DRIVE CONTROL MODULE

Diagnostic Test

CHARGING SYSTEM DTCS PRESENT

1.

Ignition on. With the scan tool, select View DTCs in the Powertrain Control Module.

Are there any Charging System or related voltage DTCs present?

Yes >>

No >>

DTC IS ACTIVE

2.

With the scan tool, select View DTCs in the Final Drive Control Module.

Is the status Active for this DTC?

Yes >> No >>

FINAL DRIVE CONTROL MODULE GROUND CIRCUITS OPEN OR HIGH RESISTANCE

3.

Turn the ignition off. Disconnect the Final Drive Control Module harness connector. With a 12–volt test light connected to B+, check the Ground circuits in

the Final Drive Control Module harness connector.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly for each of the Ground circuits?

Refer to the symptom list and perform any Charging System DTC diagnostic procedures before continuing with this test.

Go to 2

Go to 3 Go to 5

Yes >> No >>

Go to 4 Repair the Ground circuit(s) for an open circuit or high

resistance. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 78 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

FINAL DRIVE CONTROL MODULE

4.

View repair.

Repair

Replace the Final Drive Control Module in accordance with the Service information. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. While monitoring the scan tool data relative to this circuit, wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test.

Were any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 79

C2111-SENSOR SUPPLY 1 VOLTAGE CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

3 - 80 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

The FDCM recognizes the Locker Sensor Supply circuit voltage is too low.

Possible Causes

FRONT DIFFERENTIAL POSITION SENSOR REAR DIFFERENTIAL POSITION SENSOR (T521) LOCKER SENSOR SUPPLY 1 CIRCUIT SHORTED TO GROUND FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With a scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT DIFFERENTIAL POSITION SENSOR

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Turn the ignition on. Measure the voltage of the (T521) Locker Sensor 1 Supply circuit in the

Front Locker Solenoid harness connector.

Is the voltage between 4.5 and 5.0 volts?

Yes >>

No >>

Go To 2 Go To 5

Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE) Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 81

(T521) LOCKER SENSOR SUPPLY 1 CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T521) Locker Sensor 1 Supply circuit at

the FDCM harness connector.

Is the resistance below 100 ohms?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to ground in the (T521) Locker Sensor 1 Supply circuit shorted to ground.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 82 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C2112-SENSOR SUPPLY 1 VOLTAGE CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 83

• When Monitored:

Ignition on.

• Set Condition:

The FDCM recognizes the Locker Sensor Supply circuit voltage is too high.

Possible Causes

FRONT DIFFERENTIAL POSITION SENSOR REAR DIFFERENTIAL POSITION SENSOR (T521) LOCKER SENSOR 1 SUPPLY CIRCUIT SHORTED TO VOLTAGE FDCM

Diagnostic Test

ACTIVE DTC

1.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Ignition on, engine not running. With a scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

FRONT DIFFERENTIAL POSITION SENSOR

2.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Turn the ignition off. Disconnect the Front Locker Solenoid harness connector. Turn the ignition on. Measure the voltage of the (T521) Locker Sensor 1 Supply circuit in the

Front Locker Solenoid harness connector.

Is the voltage above 4.5 volts?

Yes >>

No >>

Go To 2 Go To 5

Replace the Front Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE) Go To 3

3 - 84 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T521) LOCKER SENSOR 1 SUPPLY CIRCUIT SHORTED TO VOLTAGE

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T521) Locker Sensor 1 Supply circuit at the

FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to voltage in the (T521) Locker Sensor 1 Supply circuit shorted to ground.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 85

C2126-SENSOR SUPPLY 2 VOLTAGE CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

3 - 86 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

The FDCM recognizes the Locker Sensor Supply circuit voltage is too low.

Possible Causes

FRONT DIFFERENTIAL POSITION SENSOR REAR DIFFERENTIAL POSITION SENSOR (T523) LOCKER SENSOR SUPPLY 2 CIRCUIT SHORTED TO GROUND FDCM

Diagnostic Test

ACTIVE DTC

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Ignition on, engine not running. With a scan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR DIFFERENTIAL POSITION SENSOR

2.

With the voltmeter still connected to the (T523) LOCKER SENSOR SUPPLY 2 CIRCUIT in the Front Locker Solenoid harness connector.

While monitoring the voltmeter, disconnect the Rear Locker Solenoid harness connector.

Is the voltage between 4.5 and 5.0 volts?

Yes >>

No >>

Go To 2 Go To 5

Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE) Go To 3

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 87

(T523) LOCKER SENSOR SUPPLY 2 CIRCUIT SHORTED TO GROUND

3.

Turn the ignition off. Disconnect the FDCM harness connector. Measure the resistance of the (T523) LOCKER SENSOR SUPPLY 2

CIRCUIT at the FDCM harness connector.

Is the resistance below 100 ohms?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to ground in the (T523) LOCKER SENSOR SUPPLY 2 CIRCUIT shorted to ground.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

3 - 88 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

C2127-SENSOR SUPPLY 2 VOLTAGE CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 89

• When Monitored:

Ignition on.

• Set Condition:

The FDCM recognizes the Locker Sensor Supply circuit voltage is too high.

Possible Causes

FRONT DIFFERENTIAL POSITION SENSOR REAR DIFFERENTIAL POSITION SENSOR (T523) LOCKER SENSOR SUPPLY 2 CIRCUIT SHORTED TO VOLTAGE FDCM

Diagnostic Test

ACTIVE DTC

1.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Ignition on, engine not running. With ascan tool, read DTCs.

Is the DTC active at this time?

Yes >> No >>

REAR DIFFERENTIAL POSITION SENSOR

2.

With the voltmeter still connected to the (T523) Locker Sensor Supply 2 circuit in the Front Locker Solenoid harness connector.

While monitoring the voltmeter, disconnect the Rear Locker Solenoid harness connector.

Is the voltage above 4.5 volts?

Yes >>

No >>

Go To 2 Go To 5

Replace the Rear Locker Solenoid. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE) Go To 3

3 - 90 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

(T523) LOCKER SENSOR SUPPLY 2 CIRCUIT SHORTED TO VOLTAGE

3.

Turn the ignition off. Disconnect the FDCM harness connector. Turn the ignition on. Measure the voltage of the (T523) Locker Sensor Supply 2 circuit at the

FDCM harness connector.

Does the voltmeter indicate voltage present?

Yes >>

No >>

FDCM

4.

NOTE: Before continuing, check the FDCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes >>

No >>

Repair the short to voltage in the (T523) Locker Sensor Supply 2 circuit shorted to ground.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Go To 4

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Replace and program the Final Drive Control Module in accordance with Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 91

C230F-LOCKER/DIFFERENTIAL INDICATOR SUPPLY CIRCUIT PREFORMANCE

For a complete wiring diagram Refer to Section 8W.

3 - 92 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

The FDCM sense an incorrect voltage on the Switch Supply circuit other than 12 volts.

Possible Causes

DISCONNECTING STABILIZER SWITCH (T536) SWITCH SUPPLY CIRCUIT OPEN/HIGH RESISTANCE (T532,T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT OPEN/HIGH RESISTANCE FDCM

DTC ACTIVE

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s).

Is the DTC active at this time?

Yes >> No >>

DISCONNECTING STABILIZER SWITCH OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

NOTE: If set along with this DTC, diagnose any Stabilizer Select Switch DTC(s) first before continuing.

Turn the ignition off. Disconnect the Disconnecting Stabilizer Switch harness connector. Turn the ignition on. Measure the voltage on the (T536) Switch Supply circuit in the Discon-

necting Stabilizer Switch harness connector.

Is the voltage 12 volts?

Yes >> No >>

Go To 2 Go To 5

Go To 3 Check the (T536) Switch Supply circuit for an open or short

to ground condition. If OK, replace the FDCM in accordance with the Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 93

DISCONNECTING STABILIZER SWITCH

3.

Using a test light connected to battery voltage, probe the (T532) Locker Open Illumination Sense circuit in the Disconnecting Stabilizer Switch harness connector.

With the scan tool, select System Test and actuate the Locker Open Illumination LED. Select the blinking option.

NOTE: Repeat the above test for the (T533) Locker Rear Illumination Sense circuit terminal and (T534) Locker FR/RR Illumination Sense circuit one at a time.

Does the test light illuminate and flash on and off at each circuit?

Yes >>

No >>

(T532, T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT OPEN/HIGH RESISTANCE

4.

Measure the resistance of each of the following circuits between the FDCM harness connector and the Disconnecting Stabilizer Switch harness connector.

• (T532) Locker Open Illumination Sense circuit

• (T533) Locker Rear Illumination Sense circuit

• (T534) Locker FR/RR Illumination Sense circuit

Does the ohmmeter indicate each measurement below 5.0 ohms?

Yes >>

No >>

Replace the Disconnecting Stabilizer Switch. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE) Go to 4

Replace the FDCM in accordance with the Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Repair the open or high resistance in the Illumination Sense circuit that indicated the incorrect resistance reading.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 94 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 95

C2310-STABILIZER/DIFFERENTIAL INDICATOR SUPPLY CIRCUIT LOW

For a complete wiring diagram Refer to Section 8W.

3 - 96 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

The FDCM sense an the voltage on the Switch Supply circuit is low.

Possible Causes

DISCONNECTING STABILIZER SWITCH (T536) SWITCH SUPPLY CIRCUIT SHORTED TO GROUND (T532,T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT SHORTED TO GROUND FDCM

DTC ACTIVE

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

Turn the ignition on, engine not running With the scan tool, read FDCM DTC(s).

Is the DTC active at this time?

Yes >> No >>

DISCONNECTING STABILIZER SWITCH OPERATION

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

NOTE: If set along with this DTC, diagnose any Stabilizer Select Switch DTC(s) first before continuing.

Turn the ignition off. Disconnect the Disconnecting Stabilizer Switch harness connector. Turn the ignition on. Measure the voltage on the (T536) Switch Supply circuit in the Axle

Locker Switch harness connector.

Is the voltage 12 volts?

Yes >> No >>

Go To 2 Go To 5

Go To 3 Check the (T536) Switch Supply circuit for an open or short

to ground condition. If OK, replace the FDCM in accordance with the Service Information.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 97

DISCONNECTING STABILIZER SWITCH

3.

Using a test light connected to battery voltage, probe the (T532) Locker Open Illumination Sense circuit in the Disconnecting Stabilizer Switch harness connector.

With the scan tool, select System Test and actuate the Locker Open Illumination LED. Select the blinking option.

NOTE: Repeat the above test for the (T533) Locker Rear Illumination Sense circuit terminal and (T534) Locker FR/RR Illumination Sense circuit one at a time.

Does the test light illuminate and flash on and off at each circuit?

Yes >>

No >>

(T532, T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT SHORTED TO GROUND

4.

Disconnect the Disconnecting Stabilizer Switch harness connector. Measure the resistance of each of the following circuit at the FDCM har-

ness connector to ground.

• (T532) Locker Open Illumination Sense circuit

• (T533) Locker Rear Illumination Sense circuit

• (T534) Locker FR/RR Illumination Sense circuit

Does the ohmmeter read below 100 ohms for any of the above circuit checks?

Yes >>

No >>

Replace the Disconnecting Stabilizer Switch. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUS-

PENSION/ACTIVE CHASSIS - STANDARD PROCEDURE) Go to 4

Repair the short to ground in the Illumination Sense circuit that indicated the resistance reading below 100 ohms.

Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

Replace the FDCM in accordance with the Service Information.Perform FDCM VERIFICATION TEST. (Refer to 2 SUSPENSION/ACTIVE CHASSIS - STANDARD PROCEDURE)

3 - 98 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

INTERMITTENT WIRING AND CONNECTORS

5.

The conditions necessary to set this DTC are not present at this time. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle test the wiring harness and connectors while checking for shorted and open circuits. Using the DRBIIIT, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

Were there any problems found?

Yes >>

No >>

Repair as necessary. Perform FDCM VERIFICATION TEST. (Refer to 2 - SUSPENSION/ACTIVE CHASSIS - STANDARD

PROCEDURE) Test Complete.

DR DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS 3 - 99

C2311-STABILIZER/DIFFERENTIAL INDICATOR SUPPLY CIRCUIT HIGH

For a complete wiring diagram Refer to Section 8W.

3 - 100 DIFFERENTIAL & DRIVELINE - ELECTRICAL DIAGNOSTICS DR

• When Monitored:

Ignition on.

• Set Condition:

The FDCM sense an the voltage on the Switch Supply circuit is high.

Possible Causes

DISCONNECTING STABILIZER SWITCH (T536) SWITCH SUPPLY CIRCUIT SHORTED TO VOLTAGE T536) SWITCH SUPPLY CIRCUIT OPEN (T532,T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT SHORTED TO VOLTAGE (T532,T533 or T534) LOCKER ILLUMINATION SENSE CIRCUIT OPEN FDCM

DTC ACTIVE

1.

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on the harness connector or module. Do not force the assist arm when releasing or installing the harness connector.

NOTE: If set along with this DTC, diagnose any Stabilizer Select Switch DTC(s) first before continuing.

Turn the ignition on, engine not running With the scan tool read FDCM DTC(s).

Is the DTC active at this time?

Yes >> No >>

DISCONNECTING STABILIZER BAR SWITCH

2.

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to do so can result in misdiagnoses of the system.

Turn the ignition off. Disconnect the Disconnecting Stabilizer Bar Switch harness connector. Turn the ignition on. Using a test light connected to battery voltage, probe the (T532) Locker

Open Illumination Sense circuit in the Disconnecting Stabilizer Bar Switch harness connector.

With the scan tool select System Test and actuate the Locker Open Illumination LED. Select the blinking option.

NOTE: Repeat the above test for the (T533) Locker Rear Illumination Sense circuit and (T534) Locker FR/RR Illumination Sense circuit one at a time.

Does the test light illuminate and flash on and off at each circuit?

Yes >> Go to 3 No >>

Go To 2 Go To 7

Go to 5

Dodge Differential Driveline SRM 2006 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual