Front Doors

The driver door lock switch is wired to the driver door switch assembly (DDSA). The lock switch receives a constant ground source. There are 2 signal circuits, one for lock signal, and one for unlock signal. When the switch is activated for a lock or unlock function, the normally open switch contacts for that function are closed and provide a switched ground signal to the DDSA. These switch activations are detected and processed by the DDSA and then communicated to the driver door module (DDM) via a serial data message.

The front passenger door lock switch is wired to the passenger front door module (PDM). The lock switch receives a constant ground source. There are 2 signal circuits, one for lock signal, and one for unlock signal. When the switch is activated for a lock or unlock function, the normally open switch contacts for that function are closed and provide a switched ground signal to the PDM.

The front doors do not have traditional door lock actuators. They have electronically controlled door latches that will operate depending on the status of the door lock system. This status is determined by the front door modules and the last known state of the lock system. If the last known state is LOCK, the latches will not release when the door handles are operated. If the last known state is UNLOCK, the latches will release when the door handles are operated. The front doors are also equipped with red door lock status indicators. The front door modules will supply power and ground to the indicators to illuminate them when the lock system is in a virtual state of lock. The indicators will not continuously illuminate when the vehicle is locked. They will illuminate for approximately 5 seconds after a lock switch activation or after a door handle has been operated and the front door modules are in a virtual state of lock.

Rear Doors

Each rear door lock actuator is powered and controlled by the right rear door module (RRDM) and left rear door module (LRDM) mounted in the individual door. The remote control door lock receiver (RCDLR), which is the master control for the door lock system, determines when the lock and unlock functions are permitted. The RCDLR receives and examines lock and unlock function requests from the individual door modules via serial data, or from RFA transmissions. The RCDLR also examines the transmission shift selector position and power mode information available over the serial data circuits. If the RCDLR determines that all conditions are correct for a lock or unlock function, a message is sent via serial data back to the individual door modules commanding them to perform the lock or unlock function requested.

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Door Locks Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, observe the scan tool Door Lock Switch parameter while using the driver door lock switch. The parameter should change from Idle to Lock, and Unlock.

⇒	If the value does not change between the commanded states, refer to Driver Door Lock Switch Malfunction.

2. Observe the scan tool Passenger Door Module Door Lock Switch parameter while using the passenger door lock switch. The parameter should change from Idle to Lock, and Unlock.

⇒	If the value does not change between the commanded states, refer to Passenger Door Lock Switch Malfunction.

3. Command the doors to LOCK and UNLOCK by using the door lock switch. All doors should perform the LOCK and UNLOCK functions.

⇒	If either front door does not LOCK or UNLOCK refer to Front Door Lock Malfunction.

⇒	If either rear door does not LOCK or UNLOCK refer to Rear Door Lock Malfunction.

Driver Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the driver door lock switch.
2. Test for less than 10 ohms between the ground circuit terminal C and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Door Lock Switch parameter is Idle.

⇒	If not the specified value, test the signal circuit terminals listed below for a short to ground. If the circuit tests normal, replace the driver window switch.

•	Terminal D

•	Terminal E

4. Install a 3A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool Door Lock Switch parameter is Lock.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the driver window switch.

5. Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Door Lock Switch parameter is Unlock.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the driver window switch.

6. If all circuits test normal, test or replace the driver door lock switch.

Passenger Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the passenger door lock switch.
2. Test for less than 10 ohms between the ground circuit terminal C and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Door Lock Switch parameter is Idle.

⇒	If not the specified value, test the signal circuit terminals listed below for a short to ground. If the circuit tests normal, replace the PDM.

•	Terminal D

•	Terminal E

4. Install a 3A fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool Door Lock Switch parameter is Lock.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PDM.

5. Install a 3A fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Door Lock Switch parameter is Unlock.

⇒	If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PDM.

6. If all circuits test normal, test or replace the passenger door lock switch.

Front Door Lock Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate front door latch.
2. Connect a test lamp between the control circuit terminals listed below.

•	LHD driver door latch terminal 3 and terminal 4

•	RHD driver door latch terminal 8 and terminal 9

•	RHD passenger door latch terminal 3 and terminal 4

•	LHD passenger door latch terminal 8 and terminal 9

3. Command the door to LOCK and UNLOCK by using the door lock switch. The test lamp should briefly illuminate when changing between the commanded states.

⇒	If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the door module.

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

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

Rear Door Lock Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate rear door latch.
2. Test for less than 5 ohms between the control circuit terminals listed below and ground.

•	Left rear door latch terminal 2

•	Left rear door latch terminal 3

•	Right rear door latch terminal 5

•	Right rear door latch terminal 6

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

3. Connect a test lamp between the control circuit terminals listed below.

•	Left rear door latch terminal 2 and terminal 3

•	Right rear door latch terminal 5 and terminal 6

4. Command the doors to LOCK and UNLOCK with a scan tool. The test lamp should briefly illuminate when changing between the commanded 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 control module.

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

Door Latch Assembly Test

1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Install a 15A fused jumper wire between one of the control terminals and 12V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the door latch should perform the LOCK/UNLOCK functions.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.