The driver and front passenger power door lock switches are integral components of the driver door module (DDM) and passenger door module (PDM). The switches consist of 2 positions, lock and unlock, and are in the normally open state. When placed in either the lock or unlock positions, the switches provide a direct input to there respective door control module. When a power door lock switch is operated to the lock or unlock position, the associated door control module responds by sending a serial data message indicating a change in the switch's position. This serial data message is received by the opposite door control module as well as the body control module (BCM). The DDM and PDM respond to the lock/unlock request by activating there associated power door lock motors to the appropriate direction to lock or unlock the front doors. The BCM is responsible for controlling the left and right rear passenger door lock motors. The BCM, upon receipt of a lock or unlock serial data signal, will control either the rear door lock or unlock relay. When the appropriate door lock relay is energized, the rear power door lock motors will lock or unlock the rear doors.

Battery voltage must be between 9-16 volts.

When the DDM or PDM detects a short to ground in their respective actuator lock control circuits.

The DDM/PDM will disable all front lock requests.

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Latch Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, command the front doors to LOCK and UNLOCK by using the driver and passenger door lock switches. The front doors should perform the LOCK and UNLOCK functions from each switch.

Front Door Lock Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate front door latch.
2. Ignition ON, test for less than 5 ohms between the control circuit terminal listed below and ground:

•	Driver door latch control circuit terminal 2

•	Driver door latch control circuit terminal 3

•	Front passenger door latch control circuit terminal 5

•	Front passenger door latch control circuit terminal 6

⇒	If greater than the specified range, test the control circuit for a short to voltage or an open/hign resistance. If the circuit tests normal, replace the door module.

3. Connect a test lamp between control circuit terminals of the front door latch listed below:

•	Driver door latch control circuit terminal 2 and control circuit terminal 3

•	Front passenger door latch control circuit terminal 5 and control circuit terminal 6

4. Command the door latch to LOCK and UNLOCK by using the door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.

⇒	If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the door module.

5. If all circuits test normal, test or replace the front door latch.

Door Latch Test

1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Ignition ON, install a 15 amp fused jumper wire between the control terminal listed below and 12 volts:

•	Driver door latch control terminal 3

•	Passenger door latch control terminal 5

3. Momentarily install a jumper wire between the control terminal listed below and ground. The door latch should perform the LOCK/ UNLOCK function:

•	Driver door latch control terminal 4

•	Passenger door latch control terminal 6

⇒	If the function does not perform as specified, replace the door latch.

4. Reverse the jumper wires; the door latch should perform the UNLOCK/LOCK function.

⇒	If the function does not perform as specified, replace the door latch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.