Dodge RAM 1997 3500 5.9L, RAM 1997 3500 2WD V8 5.9 Workshop Manual

dodge :: Dodge Truck RAM 3500 Truck 2WD V8-

5.9L VIN Z (1997)

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Audio Control Relay > Component Information > Description and Operation

Audio Control Relay: Description and Operation
SYSTEM OPERATION

Filter Choke/Speaker Relay

Models equipped with the Infinity premium speaker package use this choke/relay to control battery feed to the speaker-mounted amplifiers. Thechoke/relay is mounted above the heater-A/C air distribution duct, under the right side of the instrument panel. The choke/relay can be accessed byremoving the glove box bin.

The choke/relay should be checked if there is a lack of bass and low frequency response noted at the front door speakers, and no sound output atthe rear speakers. The choke/relay cannot be repaired and, if damaged or faulty, it must be replaced.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Audio Control Relay > Component Information > Description and Operation > Page 7

Audio Control Relay: Service and Repair

1. Disconnect and isolate the battery negative cable.

Knee Blocker Remove/Install

2. Remove the five screws that secure the knee blocker to the lower instrument panel and remove the knee blocker.3. On club cab models only:

Steering Column Cover Reinforcement Remove/Install - Club Cab Only

a. Remove the six screws that secure the steering column cover reinforcement to the instrument panel.b. Remove the steering column cover reinforcement from the instrument panel.

4. On models equipped with a Rear Wheel Anti-Lock (RWAL) brake system:

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Audio Control Relay > Component Information > Description and Operation > Page 8

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

RWAL Module Lower Mounting

a. Remove the two screws that secure the bottom of the RWAL module bracket to the lower instrument panel brace.

RWAL Module Upper Mounting

b. Remove the screw that secures the top of the RWAL module bracket to the instrument panel.c. Move the RWAL module far enough to access the filter, choke, and speaker relay.

Choke And Relay Remove/Install

5. Remove the two screws that secure the choke and relay mounting bracket to the instrument panel center support and remove the choke and relay
assembly.

6. Reverse the removal procedures to install.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Description and Operation

Keyless Entry Module: Description and Operation
SYSTEM OPERATION

(RKE)

On models with the Remote Keyless Entry option, a power lock and RKE module is mounted on the defrost duct beneath the instrumentpanel, behind the heater-A/C control assembly This module contains the RKE receiver and the RKE system program logic. The module alsoperforms as a smart relay for the power door locks and RKE systems, including the lock inhibit and illuminated entry features.

The RKE receiver has a memory function to retain the vehicle access code of at least one, but no more than two transmitters. The receiver isdesigned to retain the transmitter codes in memory, even if the battery is disconnected.

The power lock and RKE module receives inputs from the ignition switch, the power door lock switches, the driver door jamb switch, the key-inignition switch, and the headlamp switch. It also receives the radio signal input from the RKE transmitter. In response to those inputs, it isprogrammed to control outputs to the power lock motors and the courtesy lamp circuits.
The power lock and remote keyless entry module cannot be repaired and, if faulty or damaged, it must be replaced.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Description and Operation > Page 12

Keyless Entry Module: Testing and Inspection

1. Check the hot at all times fuse in the fuseblock module. If OK, go to Step 2. If not OK, replace the faulty fuse.2. Check for battery voltage at the hot at all times fuse in the fuseblock module. If OK, go to Step 3. If not OK, repair the open circuit to the Power
Distribution Center as required.

3. Disconnect and isolate the battery negative cable. Access the power lock and remote keyless entry module wire harness connectors.4. Unplug the wire harness connectors from the module. Check the connectors and the receptacles in the module for loose, corroded, or damaged
terminals and pins. If OK, go to Step 5. If not OK, repair as required.

5. Probe the ground circuit cavity of the black module wire harness connector and check for continuity to a good ground. There should be continuity
at all times. If OK, go to Step 6. If not OK, repair the circuit to ground as required.

6. Connect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the black module wire harness connector. If OK,
go to Step 7. If not OK, repair the open circuit to the fuse-block module as required.

7. Probe the door lock switch output (lock) circuit cavity of the black module wire harness connector and check for battery voltage as you actuate
either, or both, lock switch(es) to the Lock position. If OK, go to Step 8. If not OK, repair the open circuit to the lock switch(es) as required.

8. Probe the door lock switch output (unlock) circuit cavity of the black module wire harness connector and check for battery voltage as you actuate
either or both, lock switch(es) to the Unlock position. If OK, go to Step 9. If not OK, repair the open circuit to the lock switch(es) as required.

9. Check for continuity between the left door jamb switch sense circuit cavity of the black module wire harness connector and a good ground with the
driver door closed. There should be no continuity until the driver door is opened. If OK, go to Step 10. If not OK, repair the open circuit to thedoor jamb switch or replace the faulty door jamb switch as required.

10. Check for battery voltage at the fused ignition switch output circuit cavity of the blue module wire harness connector with the ignition switch in the
On position. If OK, turn the ignition switch to the Off position and go to Step 11. If not OK, repair the open circuit to the fuseblock module orreplace the faulty fuse in the fuseblock module as required.

11. Check for continuity to ground at the key-in switch sense circuit cavity of the blue module wire harness connector. There should be continuity with

the driver door open and the key in the ignition switch, or with the driver door open and the headlamp switch in the On position. There should beno continuity with the driver door closed, or with the key removed from the ignition switch and headlamp switch in the Off position. If OK, go toStep 12. If not OK, repair the short circuit or replace the faulty driver door jamb switch, key-in ignition switch, or headlamp switch as required.

12. Plug the wire harness connectors back into the module. With the driver door open and the headlamp switch in the On position, press and release

(RKE)

the Lock button of the Remote Keyless Entry transmitter. The door locks should cycle to the lock position and then back to the unlockposition. If OK, go to Step 13. If not OK, replace the faulty module.

13. Remove the dome lamp fuse from the fuse block module. With the doors closed, back-probe the dome lamp input circuit cavity of the black

thirty seconds

module wire harness connector and check for continuity to a good ground. There should be no continuity. Press and release the Unlock button ofthe RKE transmitter. There should now be continuity to ground for about , until the Lock button of the RKE transmitter isdepressed, or until the ignition switch is turned to the On position, whichever occurs first. If OK, go to Step 14. If not OK, replace the faultymodule.

14. Back-probe the door lock driver circuit cavity of the black module wire harness connector and check for battery voltage as the lock switch is
moved to the Lock position. Repeat the test pressing the Lock button of the RKE transmitter. If OK, go to Step 15. If not OK, replace the faultymodule.

15. Back-probe the door unlock driver circuit cavity of the black module wire harness connector and check for battery voltage as the lock switch is
moved to the Unlock position. Repeat the test pressing the Unlock button of the RKE transmitter. If OK, repair the open circuit to the lockmotor(s) as required. If not OK, replace the faulty module.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Description and Operation > Page 13

Keyless Entry Module: Service and Repair
REMOVAL

1. Disconnect and isolate the battery negative cable.

Knee Blocker Remove/Install

2. Remove the five screws that secure the knee blocker to the instrument panel and remove the knee blocker.3. On club cab models only:

Steering Column Cover Reinforcement Remove/Install - Club Cab Only

a. Remove the six screws that secure the steering column cover reinforcement to the instrument panel.b. Remove the steering column cover reinforcement from the instrument panel.

> Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Keyless Entry Module > Component Information > Description and Operation > Page

14

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

Power Lock And Remote Keyless Entry Module Remove/Install

4. Remove the two screws that secure the power lock and remote keyless entry module to the defrost duct.5. Lower the power lock and remote keyless entry module far enough to unplug the two wire harness connectors from the module.6. Remove the power lock and remote keyless entry module from under the instrument panel.

7. Reverse the removal procedures to install.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Description and Operation

Keyless Entry Module: Description and Operation
SYSTEM OPERATION

(RKE)

On models with the Remote Keyless Entry option, a power lock and RKE module is mounted on the defrost duct beneath the instrumentpanel, behind the heater-A/C control assembly This module contains the RKE receiver and the RKE system program logic. The module alsoperforms as a smart relay for the power door locks and RKE systems, including the lock inhibit and illuminated entry features.

The RKE receiver has a memory function to retain the vehicle access code of at least one, but no more than two transmitters. The receiver isdesigned to retain the transmitter codes in memory, even if the battery is disconnected.

The power lock and RKE module receives inputs from the ignition switch, the power door lock switches, the driver door jamb switch, the key-inignition switch, and the headlamp switch. It also receives the radio signal input from the RKE transmitter. In response to those inputs, it isprogrammed to control outputs to the power lock motors and the courtesy lamp circuits.
The power lock and remote keyless entry module cannot be repaired and, if faulty or damaged, it must be replaced.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Description and Operation > Page 19

Keyless Entry Module: Testing and Inspection

1. Check the hot at all times fuse in the fuseblock module. If OK, go to Step 2. If not OK, replace the faulty fuse.2. Check for battery voltage at the hot at all times fuse in the fuseblock module. If OK, go to Step 3. If not OK, repair the open circuit to the Power
Distribution Center as required.

3. Disconnect and isolate the battery negative cable. Access the power lock and remote keyless entry module wire harness connectors.4. Unplug the wire harness connectors from the module. Check the connectors and the receptacles in the module for loose, corroded, or damaged
terminals and pins. If OK, go to Step 5. If not OK, repair as required.

5. Probe the ground circuit cavity of the black module wire harness connector and check for continuity to a good ground. There should be continuity
at all times. If OK, go to Step 6. If not OK, repair the circuit to ground as required.

6. Connect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the black module wire harness connector. If OK,
go to Step 7. If not OK, repair the open circuit to the fuse-block module as required.

7. Probe the door lock switch output (lock) circuit cavity of the black module wire harness connector and check for battery voltage as you actuate
either, or both, lock switch(es) to the Lock position. If OK, go to Step 8. If not OK, repair the open circuit to the lock switch(es) as required.

8. Probe the door lock switch output (unlock) circuit cavity of the black module wire harness connector and check for battery voltage as you actuate
either or both, lock switch(es) to the Unlock position. If OK, go to Step 9. If not OK, repair the open circuit to the lock switch(es) as required.

9. Check for continuity between the left door jamb switch sense circuit cavity of the black module wire harness connector and a good ground with the
driver door closed. There should be no continuity until the driver door is opened. If OK, go to Step 10. If not OK, repair the open circuit to thedoor jamb switch or replace the faulty door jamb switch as required.

10. Check for battery voltage at the fused ignition switch output circuit cavity of the blue module wire harness connector with the ignition switch in the
On position. If OK, turn the ignition switch to the Off position and go to Step 11. If not OK, repair the open circuit to the fuseblock module orreplace the faulty fuse in the fuseblock module as required.

11. Check for continuity to ground at the key-in switch sense circuit cavity of the blue module wire harness connector. There should be continuity with

the driver door open and the key in the ignition switch, or with the driver door open and the headlamp switch in the On position. There should beno continuity with the driver door closed, or with the key removed from the ignition switch and headlamp switch in the Off position. If OK, go toStep 12. If not OK, repair the short circuit or replace the faulty driver door jamb switch, key-in ignition switch, or headlamp switch as required.

12. Plug the wire harness connectors back into the module. With the driver door open and the headlamp switch in the On position, press and release

(RKE)

the Lock button of the Remote Keyless Entry transmitter. The door locks should cycle to the lock position and then back to the unlockposition. If OK, go to Step 13. If not OK, replace the faulty module.

13. Remove the dome lamp fuse from the fuse block module. With the doors closed, back-probe the dome lamp input circuit cavity of the black

thirty seconds

module wire harness connector and check for continuity to a good ground. There should be no continuity. Press and release the Unlock button ofthe RKE transmitter. There should now be continuity to ground for about , until the Lock button of the RKE transmitter isdepressed, or until the ignition switch is turned to the On position, whichever occurs first. If OK, go to Step 14. If not OK, replace the faultymodule.

14. Back-probe the door lock driver circuit cavity of the black module wire harness connector and check for battery voltage as the lock switch is
moved to the Lock position. Repeat the test pressing the Lock button of the RKE transmitter. If OK, go to Step 15. If not OK, replace the faultymodule.

15. Back-probe the door unlock driver circuit cavity of the black module wire harness connector and check for battery voltage as the lock switch is
moved to the Unlock position. Repeat the test pressing the Unlock button of the RKE transmitter. If OK, repair the open circuit to the lockmotor(s) as required. If not OK, replace the faulty module.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Description and Operation > Page 20

Keyless Entry Module: Service and Repair
REMOVAL

1. Disconnect and isolate the battery negative cable.

Knee Blocker Remove/Install

2. Remove the five screws that secure the knee blocker to the instrument panel and remove the knee blocker.3. On club cab models only:

Steering Column Cover Reinforcement Remove/Install - Club Cab Only

a. Remove the six screws that secure the steering column cover reinforcement to the instrument panel.b. Remove the steering column cover reinforcement from the instrument panel.

> Relays and Modules > Relays and Modules - Body and Frame > Keyless Entry Module > Component Information > Description and Operation > Page 21

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

Power Lock And Remote Keyless Entry Module Remove/Install

4. Remove the two screws that secure the power lock and remote keyless entry module to the defrost duct.5. Lower the power lock and remote keyless entry module far enough to unplug the two wire harness connectors from the module.6. Remove the power lock and remote keyless entry module from under the instrument panel.

7. Reverse the removal procedures to install.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Description and Operation

Power Door Lock Control Module: Description and Operation
SYSTEM OPERATION

(RKE)

On models with the Remote Keyless Entry option, a power lock and RKE module is mounted on the defrost duct beneath the instrumentpanel, behind the heater-A/C control assembly This module contains the RKE receiver and the RKE system program logic. The module alsoperforms as a smart relay for the power door locks and RKE systems, including the lock inhibit and illuminated entry features.

The RKE receiver has a memory function to retain the vehicle access code of at least one, but no more than two transmitters. The receiver isdesigned to retain the transmitter codes in memory, even if the battery is disconnected.

The power lock and RKE module receives inputs from the ignition switch, the power door lock switches, the driver door jamb switch, the key-inignition switch, and the headlamp switch. It also receives the radio signal input from the RKE transmitter. In response to those inputs, it isprogrammed to control outputs to the power lock motors and the courtesy lamp circuits.
The power lock and remote keyless entry module cannot be repaired and, if faulty or damaged, it must be replaced.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Description and Operation > Page 25

Power Door Lock Control Module: Testing and Inspection

1. Check the hot at all times fuse in the fuseblock module. If OK, go to Step 2. If not OK, replace the faulty fuse.2. Check for battery voltage at the hot at all times fuse in the fuseblock module. If OK, go to Step 3. If not OK, repair the open circuit to the Power
Distribution Center as required.

3. Disconnect and isolate the battery negative cable. Access the power lock and remote keyless entry module wire harness connectors.4. Unplug the wire harness connectors from the module. Check the connectors and the receptacles in the module for loose, corroded, or damaged
terminals and pins. If OK, go to Step 5. If not OK, repair as required.

5. Probe the ground circuit cavity of the black module wire harness connector and check for continuity to a good ground. There should be continuity
at all times. If OK, go to Step 6. If not OK, repair the circuit to ground as required.

6. Connect the battery negative cable. Check for battery voltage at the fused B(+) circuit cavity of the black module wire harness connector. If OK,
go to Step 7. If not OK, repair the open circuit to the fuse-block module as required.

7. Probe the door lock switch output (lock) circuit cavity of the black module wire harness connector and check for battery voltage as you actuate
either, or both, lock switch(es) to the Lock position. If OK, go to Step 8. If not OK, repair the open circuit to the lock switch(es) as required.

8. Probe the door lock switch output (unlock) circuit cavity of the black module wire harness connector and check for battery voltage as you actuate
either or both, lock switch(es) to the Unlock position. If OK, go to Step 9. If not OK, repair the open circuit to the lock switch(es) as required.

9. Check for continuity between the left door jamb switch sense circuit cavity of the black module wire harness connector and a good ground with the
driver door closed. There should be no continuity until the driver door is opened. If OK, go to Step 10. If not OK, repair the open circuit to thedoor jamb switch or replace the faulty door jamb switch as required.

10. Check for battery voltage at the fused ignition switch output circuit cavity of the blue module wire harness connector with the ignition switch in the
On position. If OK, turn the ignition switch to the Off position and go to Step 11. If not OK, repair the open circuit to the fuseblock module orreplace the faulty fuse in the fuseblock module as required.

11. Check for continuity to ground at the key-in switch sense circuit cavity of the blue module wire harness connector. There should be continuity with

the driver door open and the key in the ignition switch, or with the driver door open and the headlamp switch in the On position. There should beno continuity with the driver door closed, or with the key removed from the ignition switch and headlamp switch in the Off position. If OK, go toStep 12. If not OK, repair the short circuit or replace the faulty driver door jamb switch, key-in ignition switch, or headlamp switch as required.

12. Plug the wire harness connectors back into the module. With the driver door open and the headlamp switch in the On position, press and release

(RKE)

the Lock button of the Remote Keyless Entry transmitter. The door locks should cycle to the lock position and then back to the unlockposition. If OK, go to Step 13. If not OK, replace the faulty module.

13. Remove the dome lamp fuse from the fuse block module. With the doors closed, back-probe the dome lamp input circuit cavity of the black

thirty seconds

module wire harness connector and check for continuity to a good ground. There should be no continuity. Press and release the Unlock button ofthe RKE transmitter. There should now be continuity to ground for about , until the Lock button of the RKE transmitter isdepressed, or until the ignition switch is turned to the On position, whichever occurs first. If OK, go to Step 14. If not OK, replace the faultymodule.

14. Back-probe the door lock driver circuit cavity of the black module wire harness connector and check for battery voltage as the lock switch is
moved to the Lock position. Repeat the test pressing the Lock button of the RKE transmitter. If OK, go to Step 15. If not OK, replace the faultymodule.

15. Back-probe the door unlock driver circuit cavity of the black module wire harness connector and check for battery voltage as the lock switch is
moved to the Unlock position. Repeat the test pressing the Unlock button of the RKE transmitter. If OK, repair the open circuit to the lockmotor(s) as required. If not OK, replace the faulty module.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Description and Operation > Page 26

Power Door Lock Control Module: Service and Repair
REMOVAL

1. Disconnect and isolate the battery negative cable.

Knee Blocker Remove/Install

2. Remove the five screws that secure the knee blocker to the instrument panel and remove the knee blocker.3. On club cab models only:

Steering Column Cover Reinforcement Remove/Install - Club Cab Only

a. Remove the six screws that secure the steering column cover reinforcement to the instrument panel.b. Remove the steering column cover reinforcement from the instrument panel.

> Relays and Modules > Relays and Modules - Body and Frame > Power Door Lock Control Module > Component Information > Description and Operation > Page 27

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

Power Lock And Remote Keyless Entry Module Remove/Install

4. Remove the two screws that secure the power lock and remote keyless entry module to the defrost duct.5. Lower the power lock and remote keyless entry module far enough to unplug the two wire harness connectors from the module.6. Remove the power lock and remote keyless entry module from under the instrument panel.

7. Reverse the removal procedures to install.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Light Relay > Component Information > Locations

ABS Warning Lamp Relay

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Light Relay > Component Information > Locations > Page 32

ABS Warning Lamp Relay

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations

> Relays and Modules > Relays and Modules - Brakes and Traction Control > ABS Main Relay > Component Information > Locations > Page 36

ABS Main Relay: Description and Operation

(CAB) 0 volts 12 volts

Two relays are used on the ABS. An ABS warning lamp relay is used to activate the amber ABS warning lamp. When the lamp is lit, the voltage at the Controller Antilock Brake monitoring point will be . The voltage at the monitoring point will be when the CAB energizes therelay turning the ABS lamp off. The second relay is the ABS main (pump) relay. This relay is used to supply voltage to the ABS pump motor, frontantilock valve and rear wheel antilock valve. Both relays are located in the engine compartment in the Power Distribution Center .(PDC)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Pump Relay > Component Information > Locations

Brake Fluid Pump Relay: Locations

Power Distribution Center (PDC)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Pump Relay > Component Information > Locations > Page 40

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

Power Distribution

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Pump Relay > Component Information > Locations > Page 41

Power Distribution Center

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Brake Fluid Pump Relay > Component Information > Locations > Page 42

Brake Fluid Pump Relay: Description and Operation
CIRCUIT OPERATION

(CAB)

(PDC)

When the Controller Anti Lock Brake grounds the ABS pump relay on circuit B116, the relay contacts CLOSE connecting circuit A10from the Power Distribution Center and circuit B120. Circuit A10 connects to fuse 5 in the PDC. Circuit A20 from the fuse 14 in the fuseblock splices to feed the coil side of the ABS warning lamp relay and the pump motor relay.

(RWAL)

From the ABS pump relay, circuit B120 splices to supply voltage to the ABS pump motor and all solenoids in the hydraulic control unit. CircuitB120 also supplies power to the solenoids in the Rear Wheel Anti Lock valve. Additionally, circuit B120 provides an input to cavity 34of the CAB. The input tells the CAB that voltage has been supplied to the pump motor.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Locations > ABS Control Module

Electronic Brake Control Module: LocationsABS Control Module

(RWAL)

The Rear Wheel Antilock electronic control module is located under the central portion of the instrument panel. It is mounted on a bracketattached to the back side of the panel. The module is accessible through an opening created by removal of the knee bolster.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Locations > ABS Control Module > Page 47

Electronic Brake Control Module: LocationsController Antilock Brake (CAB)

Controller Antilock Brakes And Hydraulic Control Unit

(CAB)

The Controller Antilock Brake is located at the driver's inner fender panel. The CAB is attached to the forward side of the Hydraulic Control Unit mounting bracket.(HCU)

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Locations > Page 48

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Description and Operation > With Four Wheel Antilock Brakes

Electronic Brake Control Module: Description and OperationWith Four Wheel Antilock Brakes

Controller Antilock Brakes And Hydraulic Control Unit

(CAB)

(HCU)

The Controller Antilock Brake is located at the driver's inner fender panel. The CAB is attached to the forward side of the Hydraulic Control Unit mounting bracket. The CAB is used to monitor and operate the ABS system. It monitors the brake switch and wheel speed sensors inputs toprepare for possible antilock braking. The CAB controls the antilock valve solenoid operation during all phases of antilock braking.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Description and Operation > With Four Wheel Antilock Brakes > Page 51

Electronic Brake Control Module: Description and OperationWith Rear Wheel Antilock Brakes

RWAL CAB

GENERAL INFORMATION

(CAB)

The Controller Antilock Brakes is a micro-processor which monitors and controls the ABS brake system operation. It has a 14 terminalconnector to deliver power and ground to the CAB and connect all inputs and outputs associated with the ABS system. The CAB primaryfunctions are:^

Detect wheel locking tendencies.
^ Control the application of brake fluid pressure to the rear brakes during antilock braking.
^

Monitor the Rear Wheel Antilock brake system for proper operation.(RWAL)

^ Perform self-check diagnostics.

(DTC)

The CAB continuously monitors the speed of the differential ring gear by monitoring signals generated by the rear wheel speed sensor. The CABdetermines a wheel locking tendency when it recognizes the ring gear decelerating too rapidly. When a wheel-locking tendency is detected, theCAB energizes the isolation solenoid in the RWAL valve. When the isolation solenoid is energized, hydraulic pressure cannot be increased to therear wheel cylinders. If the rear wheel speed sensor still indicate that the ring gear is decelerating too rapidly, the CAB then energizes the dumpsolenoid to reduce pressure at the rear wheel cylinders. The CAB continues this action until the wheel-locking tendency no longer exists. When afault is detected, the CAB will generate and store diagnostic trouble codes. Only one code can be stored at any one time. If the CAB senses a faultin any one of its monitored circuits, it will illuminate the red brake warning and ABS warning lamps. It will then generate a Diagnostic TroubleCode and store it in memory. In general, the diagnostic trouble code will remain in memory when the ignition key has been turned OFF.The exception to this is codes 9 and 11 which are erased any time the key has been turned OFF. Also, code 11 will be removed from memorywhen the ignition is in the RUN or ACC. positions if the malfunction that caused the code has been eliminated. For both codes 9 and 11, if themalfunction remains, the DTC will be reset on the next ignition key cycle to ON.

CAB INPUTS

The CAB monitors the following inputs to determine when a wheel locking tendency may exists:^

Rear Wheel Speed Sensor
^ Brake Lamp Switch
^ Brake Warning Lamp Switch

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Description and Operation >

With Four Wheel Antilock Brakes > Page 52

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

^ Reset Switch

CAB OUTPUTS

The CAB controls the following outputs for antilock braking and brake warning information:^

RWAL Valve
^ ABS Warning Lamp
^ Brake Warning Lamp

POWER SUPPLY AND GROUND

Ignition voltage is provided to the CAB through pin 3 and is protected by a 20 amp fuse. Ignition voltage is supplied when the ignition switch is inthe RUN or ACC. positions. The CAB requires ignition voltage to be able to operate the function of antilock brakes. Battery voltage is provided tothe CAB through pin 9 and is protected by a 20 amp fuse. This circuit supplies power to the memory cells so that the CAB can retain diagnosticinformation. Except for trouble codes 9 and 11, the CAB stores DTCs in the battery fed volatile memory. Volatile memories only retain

information as long as power is supplied to the memory. If a DTC is stored in the battery fed volatile memory, the DTC can be cleared from thememory by disconnecting the battery supply to the CAB. Trouble codes 9 and 11 are also in a volatile memory but their memories are fed withignition voltage. A ground is provide to the CAB through pin 12 of the 14-way connector. It is required by the CAB to be able to operate any of itscircuits.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Service and Repair > Four Wheel Antilock Brake System

Electronic Brake Control Module: Service and RepairFour Wheel Antilock Brake System
REMOVAL

1. Remove and isolate negative battery cable.

CAB Harness Connector

(CAB)

2. Release Controller antilock Brake connector locking handle and remove connector.3. Remove the 2 CAB mounting bolts and remove CAB from bracket.

INSTALLATION

1. Install CAB in mounting bracket.2. Install mounting bolts.3. Connect harness and lock into place with locking handle.4. Install negative battery cable.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Service and Repair > Four Wheel Antilock Brake System > Page 55

Electronic Brake Control Module: Service and RepairRear Wheel Antilock Brake System

Knee Bolster

REMOVAL

1. Remove screws from knee bolster attached to panel flange.

RWAL Module Lower Attaching Screws

2. Remove module lower attaching screws. Screws are partially hidden by air duct but can be removed with long shank, number 2 Phillips
screwdriver as shown above.

> Relays and Modules > Relays and Modules - Brakes and Traction Control > Electronic Brake Control Module > Component Information > Service and Repair > Four Wheel

Antilock Brake System > Page 56

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

RWAL Module Upper Attaching Screw

3. Remove module upper attaching screw.4. Remove module and bracket from underside of instrument panel.

5. Disconnect harness wires from module.6. If module is to be replaced, remove module from bracket. However, if module is only being removed for access to another component, leave
module in place on bracket.

INSTALLATION

1. Install module on mounting bracket, if removed.2. Connect harness wires to module.3. Position module and bracket on instrument panel and install attaching screws.4. Install knee bolster.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations

Blower Motor Relay: Locations

Fig 39 Blower Motor Relay Removal/Installation

The relay is located in the passenger compartment on the stop lamp switch bracket. The stop lamp switch bracket is secured to the inboard side of thepedal support bracket under the driver side of the instrument panel. The relay case includes a molded-in plastic slot that snaps over the blade-type relaymount on the stop lamp switch bracket.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 61

Blower Motor Relay: Description and Operation

Fig 39 Blower Motor Relay Removal/Installation

Blower Motor Relay

OPERATION

The blower motor relay is a International Standards Organization (ISO)-type relay. The relay is a electromechanical device that switches batterycurrent from a fuse in the fuse block module to the blower motor, whenever the ignition switch is in the On position. This arrangement reduces theamount of battery current that must flow through the ignition switch.

The relay is energized when the relay coil is provided a voltage signal by the ignition switch. When the relay is de-energized, the blower motorreceives no battery feed.

The relay is located in the passenger compartment on the stop lamp switch bracket. The stop lamp switch bracket is secured to the inboard side ofthe pedal support bracket under the driver side of the instrument panel. The relay case includes a molded-in plastic slot that snaps over theblade-type relay mount on the stop lamp switch bracket. The relay cannot be repaired and, if faulty or damaged, it must be replaced.

CIRCUIT OPERATION

Circuit C1 from fuse 2 in the Fuse Block supplies voltage to the contact side of the blower motor relay

(PDC)

When the ignition switch is in the RUN position it connects Circuit A2 from fuse 2 in the Power Distribution Center to Circuit A22. CircuitA22 connects to the coil side of the blower motor relay
Circuit C1 connects to Circuit C11 through the blower motor relay contacts and supplies voltage to the blower motor.

Circuit Z3 provides the ground path for the blower motor relay.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 62

Blower Motor Relay: Testing and Inspection

Blower Motor Relay

Fig 39 Blower Motor Relay Removal/Installation

RELAY TEST

Remove the blower motor relay from its wire harness connector as described to perform the following tests:

1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK.
go to Step 2. If not OK, replace the faulty relay

75 +/- 5 ohms

2. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 3. If not OK, replace the faulty relay.3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, see the Relay Circuit Test procedure. If not OK, replace the faulty relay.

RELAY CIRCUIT TEST

1. The relay common feed terminal cavity (30) is connected to battery voltage and should be hot at all times. If OK go to Step 2. If not OK, repair the
open circuit to the fuse block module as required.

2. The relay normally closed terminal cavity (87A) is connected to terminal 30 in the de-energized position, but is not used for this application. Go to

Step 3.

3. The relay normally open terminal cavity (87) is connected to the blower motor. When the relay is energized, terminal 87 is connected to terminal

30 and provides full battery current to the blower motor. There should be continuity between this cavity and the blower motor relay output circuitcavity of the blower motor wire harness connector at all times. If OK, go to Step 4. If not OK, repair the open circuit to the blower motor asrequired.

4. The coil battery terminal cavity (86) is connected to the electromagnet in the relay. It is energized when the ignition switch is in the On position.
Check for battery voltage at the cavity for relay terminal 86 with the ignition switch in the On position. If OK, go to Step 5. If not OK, repair theopen circuit to the ignition switch through the Power Distribution Center (PDC) as required.

5. The coil ground terminal cavity (85) is connected to ground. This terminal supplies the ground for the relay electromagnetic coil. There should be
continuity between the cavity for relay terminal 85 and a good ground at all times. If not OK, repair the open circuit as required.

> Relays and Modules > Relays and Modules - HVAC > Blower Motor Relay > Component Information > Locations > Page 63

Blower Motor Relay: Service and Repair

Fig 39 Blower Motor Relay Removal/Installation

NOTE:

The blower motor relay and wire harness connector are snap-fit onto a blade-type retainer located on the stop lamp switch mounting bracket.The stop lamp switch mounting bracket is secured with two screws to the inboard side of the brake pedal support bracket, under the driver side of theinstrument panel. To remove the relay:

1. Disconnect and isolate the battery negative cable.2. Reach under the knee blocker on the driver side of the instrument panel between the throttle and brake pedals, and unsnap the relay from the blade
on the stop lamp switch bracket.

3. Lower the relay from under the instrument panel far enough to unplug the relay from the wire harness connector.4. To install the relay, align the terminals with the cavities in the relay wire harness connector and push the relay firmly into place.5. Reverse the remaining removal procedures to complete the installation.6. Test the relay operation.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Component Locations

Compressor Clutch Relay: Component Locations

Power Distribution Center (PDC)

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Component Locations > Page 68

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

Power Distribution

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Component Locations > Page 69

Pinout

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 70

Compressor Clutch Relay: Description and Operation

Compressor Clutch Relay

The compressor clutch relay is a International Standards Organization (ISO) micro-relay The terminal designations and functions are the same as aconventional ISO relay However, the micro-relay terminal orientation (footprint) is different, the current capacity is lower and the relay case dimensionsare smaller than on the conventional ISO relay.

The compressor clutch relay is a electromechanical device that switches current to the compressor clutch coil when the Powertrain Control Module(PCM) grounds the coil side of the relay The PCM responds to inputs from the heater-A/C mode control switch, the low pressure cycling clutch switch,and the high pressure cut-off switch.

The compressor clutch relay is located in the Power Distribution Center (PDC) in the engine compartment. Refer to the PDC label for relay identificationand location.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 71

Compressor Clutch Relay: Testing and Inspection

Compressor Clutch Relay

RELAY TEST

(PDC)

The compressor clutch relay is located in the Power Distribution Center . Refer to the PDC label for relay identification and location. Remove therelay from the PDC to perform the following tests:

1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,
go to Step 2. If not OK, replace the faulty relay.

75 +/-5 ohms

2. Resistance between terminals 85 and 86 (electromagnet) should be . If OK, go to Step 3. If not OK, replace the faulty relay.3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, SEE the Relay Circuit Test. If not OK, replace the faulty relay.

RELAY CIRCUIT TEST

1. The relay common feed terminal cavity (30) is connected to fused battery feed. There should be battery voltage at the cavity for relay terminal 30
at all times. If OK, go to Step 2. If not OK, repair the open circuit to the PDC fuse as required.

2. The relay normally closed terminal (87A) is not used in this application. Go to Step 3.3. The relay normally open terminal cavity (87) is connected to the compressor clutch coil. There should be continuity between this cavity and the
A/C compressor clutch relay output circuit cavity of the compressor clutch coil wire harness connector. If OK, go to Step 4. If not OK, repair theopen circuit as required.

4. The relay coil battery terminal (86) is connected to the fused ignition switch output (run/start) circuit. There should be battery voltage at the cavity
for relay terminal 86 with the ignition switch in the On position. If OK, go to Step 5. If not OK, repair the open circuit to the fuse block module asrequired.

5. The coil ground terminal cavity (85) is switched to ground through the Powertrain Control Module (PCM). There should be continuity between
this cavity and the A/C compressor clutch relay control circuit cavity of the PCM wire harness connector C (gray) at all times. If not OK, repair theopen circuit as required.

> Relays and Modules > Relays and Modules - HVAC > Compressor Clutch Relay > Component Information > Locations > Page 72

Compressor Clutch Relay: Service and Repair

Fig 24 Power Distribution Center

(PDC)

1. Disconnect and isolate the battery negative cable.2. Remove the cover from the Power Distribution Center .3. Refer to the label on the PDC for compressor clutch relay identification and location.4. Unplug the compressor clutch relay from the PDC.5. Install the compressor clutch relay by aligning the relay terminals with the cavities in the PDC and pushing the relay firmly into place.6. Install the PDC cover.7. Connect the battery negative cable(s).8. Test the relay operation.

> Relays and Modules > Relays and Modules - Instrument Panel > ABS Light Relay > Component Information > Locations

ABS Warning Lamp Relay

> Relays and Modules > Relays and Modules - Instrument Panel > ABS Light Relay > Component Information > Locations > Page 77

ABS Warning Lamp Relay

> Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device Control Module > Component Information > Technical Service Bulletins > Customer Interest for Audible Warning Device Control

Module: > 084796 > Dec > 96 > Radio - Interference From Buzzer Module

Audible Warning Device Control Module: Customer InterestRadio - Interference From Buzzer Module

NO: 08-47-96
GROUP: Electrical
DATE: Dec. 20, 1996

SUBJECT: Radio Interference From Buzzer Module

MODELS: 1997 (BR) Ram Truck
SYMPTOM/CONDITION:
Buzzing noise in the rear radio speakers (radio ON) with the ignition ON and the door ajar.
DIAGNOSIS:

With the doors of the vehicle closed, turn the ignition key to the RUN/AGG position. Turn the radio ON and tune the radio to an AM radio station thatprovides a clear reception. Position the fade control to the rear speakers. Open the drivers side door. If a buzzing noise is heard in the rear radio speakers(radio ON) with the drivers door open but is eliminated with the door closed, perform the following Repair Procedure.
PARTS REQUIRED:

1 56001077AB Buzzer Module, Key In Ignition/Headlamp On/Seat Belt Warning
REPAIR PROCEDURE:
This bulletin involves replacing the key in ignition buzzer module with a revised part.

1. Record the radio station presets.

2.
Disconnect and isolate the battery negative cable. On vehicles equipped with the 5.9L Cummins diesel engine, disconnect and isolate bothbatteries.

3. Remove the fuse access panel from the left end of the instrument panel.

> Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device Control Module > Component Information > Technical Service Bulletins >

Customer Interest for Audible Warning Device Control Module: > 084796 > Dec > 96 > Radio - Interference From Buzzer Module > Page 86

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

4. Remove the five screws that secure the knee blocker to the instrument panel and remove the knee blocker (Figure 1).

5.
On Club Cab models only, remove the six screws that secure the steering column reinforcement to the instrument panel (Figure 2) and remove thereinforcement.

6. Loosen but do not remove the two fuseblock module mounting screws (Figure 3).

> Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device Control Module > Component Information > Technical Service Bulletins >

Customer Interest for Audible Warning Device Control Module: > 084796 > Dec > 96 > Radio - Interference From Buzzer Module > Page 87

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

7.
From underneath the instrument panel, gently push the fuseblock module towards the rear of the vehicle. At the same time, reach through the fuseaccess panel opening in the left end of the instrument panel and unplug the buzzer module from the receptacle in the fuseblock module (Figure 4).

8.
Install buzzer module (pin 56OOIO77AB) by aligning the module terminals with the cavities in the fuseblock module receptacle, then push themodule firmly into place.

9. Tighten the two fuseblock module mounting screws.

10. On Club Cab models, install the steering column cover reinforcement and secure it with the six attaching screws.

11. Install the knee blocker and secure it with the five attaching screws.

12. Install the fuse access cover.

13. Connect the battery negative cable(s) and reprogram the radio station presets to the radio frequencies recorded in step 1 and set the clock.

POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-80-35-90 0.3 Hrs.
FAILURE CODE: P8 - New Part

> Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device Control Module > Component Information > Technical Service Bulletins > All Technical Service Bulletins for Audible Warning

Device Control Module: > 084796 > Dec > 96 > Radio - Interference From Buzzer Module

Audible Warning Device Control Module: All Technical Service BulletinsRadio - Interference From Buzzer Module

NO: 08-47-96
GROUP: Electrical
DATE: Dec. 20, 1996

SUBJECT: Radio Interference From Buzzer Module

MODELS: 1997 (BR) Ram Truck
SYMPTOM/CONDITION:
Buzzing noise in the rear radio speakers (radio ON) with the ignition ON and the door ajar.
DIAGNOSIS:

With the doors of the vehicle closed, turn the ignition key to the RUN/AGG position. Turn the radio ON and tune the radio to an AM radio station thatprovides a clear reception. Position the fade control to the rear speakers. Open the drivers side door. If a buzzing noise is heard in the rear radio speakers(radio ON) with the drivers door open but is eliminated with the door closed, perform the following Repair Procedure.
PARTS REQUIRED:

1 56001077AB Buzzer Module, Key In Ignition/Headlamp On/Seat Belt Warning
REPAIR PROCEDURE:
This bulletin involves replacing the key in ignition buzzer module with a revised part.

1. Record the radio station presets.

2.
Disconnect and isolate the battery negative cable. On vehicles equipped with the 5.9L Cummins diesel engine, disconnect and isolate bothbatteries.

3. Remove the fuse access panel from the left end of the instrument panel.

> Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device Control Module > Component Information > Technical Service Bulletins > All

Technical Service Bulletins for Audible Warning Device Control Module: > 084796 > Dec > 96 > Radio - Interference From Buzzer Module > Page 93

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

4. Remove the five screws that secure the knee blocker to the instrument panel and remove the knee blocker (Figure 1).

5.
On Club Cab models only, remove the six screws that secure the steering column reinforcement to the instrument panel (Figure 2) and remove thereinforcement.

6. Loosen but do not remove the two fuseblock module mounting screws (Figure 3).

> Relays and Modules > Relays and Modules - Instrument Panel > Audible Warning Device Control Module > Component Information > Technical Service Bulletins > All

Technical Service Bulletins for Audible Warning Device Control Module: > 084796 > Dec > 96 > Radio - Interference From Buzzer Module > Page 94

RAM 3500 Truck 2WD V8-5.9L VIN Z (1997)

7.
From underneath the instrument panel, gently push the fuseblock module towards the rear of the vehicle. At the same time, reach through the fuseaccess panel opening in the left end of the instrument panel and unplug the buzzer module from the receptacle in the fuseblock module (Figure 4).

8.
Install buzzer module (pin 56OOIO77AB) by aligning the module terminals with the cavities in the fuseblock module receptacle, then push themodule firmly into place.

9. Tighten the two fuseblock module mounting screws.

10. On Club Cab models, install the steering column cover reinforcement and secure it with the six attaching screws.

11. Install the knee blocker and secure it with the five attaching screws.

12. Install the fuse access cover.

13. Connect the battery negative cable(s) and reprogram the radio station presets to the radio frequencies recorded in step 1 and set the clock.

POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No: 08-80-35-90 0.3 Hrs.
FAILURE CODE: P8 - New Part