Dodge Message 3500 2005, Message 2500 2005, Message 1500 2005 Service Manual

DR/DH MESSAGE SYSTEMS 8M - 1

MESSAGE SYSTEMS

TABLE OF CONTENTS

page page

OVERHEAD CONSOLE - ELECTRICAL

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

OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS

TABLE OF CONTENTS

OVERHEAD CONSOLE - ELECTRICAL

DIAGNOSTICS

DIAGNOSIS AND TESTING

BUS MESSAGES MISSING ...............2

CMTC INTERNAL FAILURE ...............3

DEMAGNETIZE COMPASS AS PER

SERVICE MANUAL .....................4

FCM - AMBIENT TEMP CONFIGURATION

ERROR ..............................5

FCM - AMBIENT TEMP SENSOR INPUT

LOW ................................6

FCM - AMBIENT TEMP SENSOR INPUT

OPEN ...............................9

SET COMPASS VARIANCE AS PER

SERVICE INFORMATION ................12

OVERHEAD CONSOLE - SERVICE

INFORMATION.......................... 22

page page

*AVERAGE FUEL ECONOMY INACCURATE

OR WRONG..........................13

*DISTANCE TO EMPTY INACCURATE OR

WRONG.............................14

*ELAPSED IGNITION ON TIME

INACCURATE OR WRONG ..............15

*TRIP ODOMETER INACCURATE OR

WRONG.............................16

*CMTC OR EVIC INOPERATIVE ..........17

*COMPASS TEST FAILURE ..............19

*TEMPERATURE DISPLAY INACCURATE OR

INOPERATIVE ........................20

SCHEMATICS AND DIAGRAMS ............21

OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS

DIAGNOSIS AND TESTING

8M - 2 OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS DR/DH

BUS MESSAGES MISSING

For a complete wiring diagram Refer to Section 8W.

Possible Causes

NO RESPONSE - PCI BUS - PCM NO RESPONSE - PCI BUS - MIC

NO RESPONSE - PCI BUS - PCM

Turn the ignition on. With the DRBIIIT, select SYSTEM MONITORS, then J1850 Module Scan..

Does the DRBIIIT display PCM Active on the Bus?

Yes >> No >>

NO RESPONSE - PCI BUS - MIC

Turn the ignition on. With the DRBIIIT, select Electro/Mechanical Instrument Cluster.

Is there a response from the Instrument Cluster?

Yes >>

No >>

Go To 2 Refer to COMMUNICATION category for the related symptom.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

Replace and configure the Electronic Overhead Module in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

Refer to COMMUNICATION category for the related symptom. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

DR/DH OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS 8M - 3

CMTC INTERNAL FAILURE

For a complete wiring diagram Refer to Section 8W.

Possible Causes

ELECTRONIC OVERHEAD MODULE

Diagnostic Test

ELECTRONIC OVERHEAD MODULE

Perform the EOM Self Test. Turn the ignition off. Press and hold the C/T button and the RESET button. Turn the ignition on.

NOTE: The EOM Self Test can also be performed using the DRBIIIT.

Turn the ignition on. With the DRBIIIT, select body, EOM, System Test, then Self Test. Observe the DRBIIIT or the EOM display following the Self Test.

When the trouble code EOM INTERNAL FAILURE is displayed, View repair.

Repair

Replace and program the Electronic Overhead Module in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

8M - 4 OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS DR/DH

DEMAGNETIZE COMPASS AS PER SERVICE MANUAL

For a complete wiring diagram Refer to Section 8W.

Possible Causes

DEMAGNETIZE COMPASS

Diagnostic Test

DEMAGNETIZE COMPASS

NOTE: A blank compass display indicates that vehicle demagnetizing is required. NOTE: After demagnetizing, the vehicle will enter Auto Fast-Cal when the ignition is turned on. NOTE: Ensure that the correct compass variance is stored in the compass memory. See (Setting Compass

Variance( in the Service Information.

Refer to the Service Information for the Demagnetizing Procedure.

View repair for Verification Test.

Repair

When the Demagnetizing Procedure is complete perform the Verification Test. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

DR/DH OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS 8M - 5

FCM - AMBIENT TEMP CONFIGURATION ERROR

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

During power up.

• Set Condition:

The FCM detects that an Ambient Temperature Sensor is present on the input circuit and has gone through auto-configuration and another module is transmitting a redundant ambient temp message.

Possible Causes

INCORRECT CONFIGURATION

Diagnostic Test

INCORRECT CONFIGURATION

NOTE: This code will only set if the FCM detects that another module transmitting a redundant ambient temp message.

NOTE: Diagnose and repair any Communication DTCs before proceeding with this test.

Ensure that the vehicle has only one Ambient Temperature Sensor, and that it is hardwired to the FCM. With the DRBIIIT, erase DTCs. Cycle the ignition to auto-configure the FCM. With the DRBIIIT, read DTCs.

Did this DTC reset?

Yes >>

No >>

Ensure that the vehicle is not equipped with multiple Ambient Temperature Sensors. If vehicle is equipped with NGC, disconnect the ambient temp sensor to the FCM and cycle the ignition.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.) Replace and program the Front Control Module in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

8M - 6 OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS DR/DH

FCM - AMBIENT TEMP SENSOR INPUT LOW

DR/DH OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS 8M - 7

FCM - AMBIENT TEMP SENSOR INPUT LOW (CONTINUED)

For the Electronic Overhead Module circuit diagram (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

Continuous with the ignition on.

• Set Condition:

The FCM detects less than 0.5 volts on the Ambient Temperature Sensor Signal circuit.

Possible Causes

(G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (G180) AMBIENT

TEMPERATURE SENSOR GROUND CIRCUIT AMBIENT TEMPERATURE SENSOR

Diagnostic Test

AMBIENT TEMPERATURE SENSOR

Disconnect the Ambient Temperature Sensor harness connector. Close all vehicle doors. Turn the ignition on. With the DRBIIIT in Sensors, read the Ambient Temperature Sensor

voltage.

Is the voltage above 4.8 volts?

Yes >>

No >>

Replace the Ambient Temperature Sensor. Perform BODY VERIFICATION TEST - VER 1. (Refer to

BODY VERIFICATION TEST - VER 1.) Go To 2

8M - 8 OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS DR/DH

FCM - AMBIENT TEMP SENSOR INPUT LOW (CONTINUED)

CHECK THE (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

Turn the ignition off. Disconnect the IPM C3 harness connector. Measure the resistance between ground and the (G31) Ambient Tem-

perature Sensor Signal circuit.

Is the resistance below 5.0 ohms?

Yes >>

No >>

CHECK THE (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO THE (G180)

AMBIENT TEMPERATURE SENSOR GROUND CIRCUIT

Measure the resistance between the (G31) Ambient Temperature Sensor Signal circuit and the (G180) Ambient Temperature Sensor Ground circuit.

Repair the (G31) Ambient Temperature Sensor Signal circuit for a short to ground.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

Go To 3

Is the resistance below 5.0 ohms?

Yes >>

No >>

Repair the (G31) Ambient Temperature Sensor Signal circuit for a short to the (G180) Ambient Temperature Sensor Ground circuit..

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

Replace the Front Control Module in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

DR/DH OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS 8M - 9

FCM - AMBIENT TEMP SENSOR INPUT OPEN

For the Electronic Overhead Module circuit diagram (Refer to 8 - ELECTRICAL/OVERHEAD CONSOLE - SCHEMATICS AND DIAGRAMS).

For a complete wiring diagram Refer to Section 8W.

• When Monitored:

Continuous with the ignition on.

• Set Condition:

The FCM detects more than 5.0 volts on the Ambient Temperature Sensor Signal circuit.

Possible Causes

(G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE (G930) AMBIENT TEMPERATURE SENSOR GROUND CIRCUIT OPEN (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN AMBIENT TEMPERATURE SENSOR

AMBIENT TEMPERATURE SENSOR

Disconnect the Ambient Temperature Sensor harness connector. Connect a jumper wire between the sensor signal and sensor ground

circuits. Close all vehicle doors. Turn the ignition on. With the DRBIIIT in Sensors, read the Ambient Temperature Sensor

voltage.

Is the voltage below 0.5 volts?

Yes >>

No >>

Replace the Ambient Temperature Sensor. Perform BODY VERIFICATION TEST - VER 1. (Refer to

BODY VERIFICATION TEST - VER 1.) Go To 2

8M - 10 OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS DR/DH

FCM - AMBIENT TEMP SENSOR INPUT OPEN (CONTINUED)

CHECK THE (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

Turn the ignition off. Disconnect the IPM C3 harness connector. Turn the ignition on. Measure the voltage between the (G31) Ambient Temperature Sensor

Signal circuit and ground.

Is there any voltage present?

Yes >>

No >>

CHECK THE (G180) AMBIENT TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN

Turn the ignition off. Measure the resistance of the (G180) Ambient Temperature Sensor

Ground circuit between the IPM C3 harness connector and the Ambient Temperature Sensor harness connector.

Is the resistance above 5.0 ohms?

Repair the (G31) Ambient Temperature Sensor Signal circuit for a short to voltage.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

Go To 3

Yes >>

No >>

Repair the (G180) Ambient Temperature Sensor Ground circuit for an open.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

Go To 4

DR/DH OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS 8M - 11

FCM - AMBIENT TEMP SENSOR INPUT OPEN (CONTINUED)

CHECK THE (G31) AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR AN OPEN

Measure the resistance of the (G31) Ambient Temperature Sensor Signal circuit between the IPM C3 harness connector and the Ambient Temperature Sensor harness connector.

Is the resistance above 5.0 ohms?

Yes >>

No >>

Repair the (G31) Ambient Temperature Sensor Signal circuit for an open.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

Replace the Front Control Module in accordance with the Service Information.

Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

8M - 12 OVERHEAD CONSOLE - ELECTRICAL DIAGNOSTICS DR/DH

SET COMPASS VARIANCE AS PER SERVICE INFORMATION

For a complete wiring diagram Refer to Section 8W.

Possible Causes

SET COMPASS VARIANCE

Refer to the Service Information for the Compass Variance procedure.

View repair for the Verification Test.

Repair

When the Compass Variance procedure is complete perform the Verification Test. Perform BODY VERIFICATION TEST - VER 1. (Refer to BODY VERIFICATION TEST - VER 1.)

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