Power Door Locks Malfunction Except RPO AN3/DL3

The power door locks are controlled by the body control module (BCM) through lock and unlock printed circuit board relays in the IP fuse block. The driver and passenger door lock switches are normally open, 2 position rocker type switches, with detents for lock and unlock. The lock and unlock switch signal circuits are referenced from battery voltage by the BCM and when a door lock or unlock switch is pressed the signal circuit is closed to ground through the switch contacts and BCM determines the signal is active. The unlock relays are controlled by the BCM through driver door and passenger door low side drive control circuits and the lock relays are controlled through a single high side drive control circuit. During lock or unlock operation, battery voltage will be supplied to the lock actuators through the energized relays and grounded through the de-energized relays.

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 Driver Door Unlock Sw. and Driver Door Lock Sw. parameters while using the driver door lock switch. The parameter should change between Inactive and Active.

⇒	If the parameter does not change, refer to Door Lock Switch Malfunction.

2. Observe the scan tool Psgr Door Unlock Sw. and Psgr Door Lock Sw. parameters while using the passenger door lock switch. The parameter should change between Inactive and Active.

⇒	If the parameter does not change, refer to Door Lock Switch Malfunction.

3. Command the doors to LOCK and UNLOCK with a scan tool, all doors should perform the LOCK and UNLOCK function.

⇒	If one or more doors do not LOCK or UNLOCK, refer to Door Lock Malfunction.

Door Lock Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for less than 1 ohm between the ground circuit terminal B 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 Unlock Sw parameter is Inactive.

⇒	If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.

4. Verify the scan tool Door Lock Sw parameter is Inactive.

⇒	If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM

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

⇒	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 BCM.

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

⇒	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 BCM.

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

Door Lock Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the I/P fuse block.
2. Test for less than 1 ohm between the ground circuit terminal E1 and ground.

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

3. Connect the X1 harness connector and disconnect the X2 and X3 harness connectors.
4. Connect a test lamp between the control circuit terminal listed below and ground:

•	X2 harness connector, control circuit terminal A3 (except RPO YE9)

•	X3 harness connector, control circuit terminal A2 (RPO YE9)

5. Ignition ON, command the doors to LOCK with a scan tool, the test lamp should illuminate during the LOCK command.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM

6. Connect a test lamp between the X3 harness connector control circuit terminal A3 and B+.
7. Command the doors to UNLOCK with a scan tool, the test lamp should illuminate during the UNLOCK command.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM

8. Connect a test lamp between the control circuit terminal listed below and B+:

•	X3 harness connector, control circuit terminal A2 (except RPO YE9)

•	X2 harness connector, control circuit terminal A2 (RPO YE9)

9. Command the doors to UNLOCK by using the driver door lock switch, the test lamp should illuminate during the UNLOCK command.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

10. Ignition OFF, connect the X2 and X3 harness connectors at the I/P fuse block and disconnect the appropriate door latch
11. Test for less than 1 ohm between the control circuit terminal listed below and ground:

•	Control circuit terminal 2

•	Control circuit terminal 3

•	Control circuit terminal 5

•	Control circuit 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 I/P fuse block.

12. Ignition ON, connect a test lamp between the control circuit terminals:

•	Control circuit terminals 5 and 6

•	Control circuit terminals 2 and 3

13. Command all doors to LOCK and UNLOCK by using the driver door lock switch. The test lamp should illuminate during the LOCK and UNLOCK command.

⇒	If the test lamp remains 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 I/P fuse block.

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

Door Lock Switch

1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for infinite resistance between the signal terminals D and E and the ground terminal B with the switch in the open position.

⇒	If not the specified value, replace the door lock switch.

3. Test for less than 2 ohms between the signal terminal D and the ground terminal B with the switch in the LOCK position.

⇒	If greater than the specified range, replace the door lock switch.

4. Test for less than 2 ohms between the signal terminal E and the ground terminal B with the switch in the UNLOCK position.

⇒	If greater than the specified range, replace the door lock switch.

Door Lock

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.

Power Door Locks Malfunction With RPO AN3/DL3

The driver and front passenger power door lock switches are integral components of the driver door switch (DDS) and passenger door switch (PDS). 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 switches position. This serial data message is received by the opposite door control module as well as the body control module (BCM). The DDS and PDS respond to the lock/unlock request by activating their 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.

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, command the front doors to LOCK and UNLOCK by using the door lock switches, the front doors should perform LOCK and UNLOCK function.

⇒	If the driver door does not LOCK or UNLOCK, refer to Driver Door Lock Malfunction.

⇒	If the passenger door does not LOCK or UNLOCK, refer to Passenger Door Lock Malfunction

2. Command the rear doors to LOCK and UNLOCK with a scan tool, the rear doors should perform LOCK and UNLOCK function.

⇒	If a rear door does not LOCK or UNLOCK, refer to Rear Door Lock Malfunction

Driver Door Lock Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the DDS.
2. Test for less than 1 ohm between the ground circuit terminal 6 and ground.

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

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit listed below and ground.

•	B+ circuit terminal 2

•	B+ circuit terminal 4

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition OFF, connect the X1 harness connector at the DDS and disconnect the harness connector at the driver door latch.
5. Test for less than 2 ohms between the control circuit terminal 3 and ground.

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

6. Test for less than 2 ohms between the control circuit terminal 2 and ground.

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

7. Ignition ON, connect a test lamp between the control circuit terminal 3 and control circuit terminal 2.
8. Command the door to LOCK and UNLOCK by using the driver door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.

⇒	If the test lamp does not illuminate during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the DDS.

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

Passenger Door Lock Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the PDS.
2. Test for less than 1 ohm between the ground circuit terminal 6 and ground.

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

3. Ignition ON, verify that a test lamp illuminates between the B+ circuit listed below and ground.

•	B+ circuit terminal 2

•	B+ circuit terminal 4

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition OFF, connect the X1 harness connector at the PDS and disconnect the harness connector at the passenger door latch
5. Test for less than 2 ohms between the control circuit terminal 5 and ground.

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

6. Test for less than 2 ohms between the control circuit terminal 6 and ground.

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

7. Ignition ON, connect a test lamp between the control circuit terminal 5 and control circuit terminal 6.
8. Command the door to LOCK and UNLOCK by using the passenger door lock switch. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.

⇒	If the test lamp does not illuminate during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the PDS.

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

Rear Door Lock Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the I/P fuse block.
2. Test for less than 1 ohm between the ground circuit terminal E1 and ground.

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

3. Connect the X1 harness connector and disconnect the X3 harness connector at the I/P fuse block.
4. Connect a test lamp between control circuit terminal A2 and ground.
5. Ignition ON, command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

6. Connect a test lamp between control circuit terminal A3 and B+.
7. Command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or and open/high resistance. If the circuit tests normal, replace the BCM.

8. Ignition OFF, connect the harness connector at the I/P fuse block. Disconnect the harness connector at the appropriate rear door latch.
9. Test for less than 2 ohms between the lock control circuit terminal listed below and ground:

•	LR passenger door latch terminal 2

•	LR passenger door latch terminal 3

•	RR passenger door latch terminal 5

•	RR passenger door latch terminal 6

⇒	If greater than the specified range, test the lock control circuit for a short to voltage or an open/high resistance. If circuits test normal and the circuit fuse is normal, replace the I/P fuse block.

10. Ignition ON, connect a test lamp between the control circuit terminals of the door latch listed below:

•	LR passenger door latch terminals 2 and 3

•	RR passenger door latch terminals 5 and 6

11. Command the door to LOCK and UNLOCK with a scan tool. The test lamp should briefly illuminate when commanding the LOCK and UNLOCK states.

⇒	If the test lamp does not illuminate during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the I/P fuse block.

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

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.