Power Door Latch System Malfunction North America

The driver and front passenger power door lock switches are integral components of the driver door lock/window switch and passenger door lock/window switch. 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 driver door lock/window switch and passenger door lock/window switch 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.

When either exterior door handle is lifted, switched ground signals are sent to the driver door lock/window switch or passenger door lock/window switch and the remote control door lock receiver (RCDLR) through the LF or RF door handle switch signal circuits. Upon receipt of these inputs, the driver door lock/window switch or passenger door lock/window switch and the RCDLR will check the status of the power door lock system. Control of the power door latches is dependent on the door lock status. If the status of the door lock system is UNLOCK, the power door latches will electrically release after lifting the exterior door handle. If the status of the door lock system is LOCK, one of the following inputs will be required before the latch will release.

Once the enable criteria has been met, the driver door lock/window switch or passenger door lock/window switch will supply power and ground to the door latch motor control circuits and the door will release.

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

1. Ignition ON, command the doors to LOCK and UNLOCK by using the driver and passenger door lock switches, the doors should perform the LOCK and UNLOCK command from both switches.

⇒	If the driver door lock switch is inoperative, refer to Driver Door Lock Malfunction.

⇒	If the passenger door lock switch is inoperative, refer to Passenger Door Lock Malfunction.

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

2. With the doors unlocked, open the driver and passenger doors by using their respective exterior door handles. The driver and passenger doors should release and open when using the exterior door handles.

⇒	If either door does not release, refer to Exterior Door Handle Switch Malfunction With RPO UHA/UHF.

⇒	If either door does not release, refer to Exterior Door Handle Switch Malfunction Without RPO UHA/UHF

Driver Door Lock Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the driver door lock/window switch.
2. Test for less than 10 ohms 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 terminal 4 and ground.

⇒	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 driver door lock/window switch and disconnect the harness connector at the driver door latch.
5. Test for less than 5 ohms between the control circuit terminal 3 and ground.

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

6. Test for less than 5 ohms between the control circuit terminal 4 and ground.

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

7. Connect a test lamp between the control circuit terminal 3 and the control circuit terminal 4.
8. Ignition ON, command the driver door latch to LOCK and UNLOCK by using the driver door lock switch, the test lamp should briefly illuminate during the LOCK and UNLOCK command.

⇒	If the test lamp does not illuminate during either of the commands, test either control circuit for a short to ground. If both circuits tests normal, replace the driver door lock/window switch.

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 passenger door lock/window switch.
2. Test for less than 10 ohms 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 terminal 4 and ground.

⇒	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 passenger door lock/window switch and disconnect the harness connector at the passenger door latch.
5. Test for less than 5 ohms between the control circuit terminal 8 and ground.

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

6. Test for less than 5 ohms between the control circuit terminal 9 and ground.

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

7. Connect a test lamp between the control circuit terminal 8 and the control circuit terminal 9.
8. Ignition ON, command the passenger door latch to LOCK and UNLOCK by using the passenger door lock switch, the test lamp should briefly illuminate during the LOCK and UNLOCK command.

⇒	If the test lamp does not illuminate during either of the commands, test either control circuit for a short to ground. If both circuits tests normal, replace the passenger door lock/window switch.

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

Rear Door Lock Malfunction

1. Ignition OFF, disconnect the UNLCK relay.
2. Test for less than 20 ohms between the ground circuit terminal 87A and ground.

⇒	If greater than the specified range, test the ground circuit for a short to voltage or an open/high resistance.

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

•	B+ circuit terminal 86

•	B+ circuit terminal 87

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

4. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
5. 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 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.

6. Ignition OFF, connect the UNLCK relay and disconnect the LCK relay.
7. Test for less than 20 ohms between the ground circuit terminals listed below and ground:

•	Ground circuit terminal 86

•	Ground circuit terminal 87A

⇒	If greater than the specified range, test the ground circuit for a short to voltage or an open/high resistance.

8. Connect a test lamp between the ground circuit terminal 86 and the control circuit terminal 85.
9. 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 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.

10. Ignition OFF, connect the LCK relay and disconnect the harness connector at the appropriate rear door latch.
11. Test for less than 20 ohms between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 2

•	RR door latch control circuit terminal 5

⇒	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, test or replace the UNLCK relay.

12. Test for less than 20 ohms between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 3

•	RR door latch 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, test or replace the LCK relay.

13. Connect a test lamp between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 2

•	RR door latch control circuit terminal 5

14. 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 OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the UNLCK relay.

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

15. Connect a test lamp between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 3

•	RR door latch control circuit terminal 6

16. 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 OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the LCK relay.

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

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

Door Handle Lift Switch Malfunction With RPO UHA/UHF

1. Ignition OFF, disconnect the harness connector at the appropriate exterior door handle 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. Test for less than 10 ohms between the ground circuit terminal F and ground.

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

4. Ignition OFF, disconnect the X1 harness connector at the RCDLR.
5. Ignition ON, test for greater than 9 volts between the signal circuit terminal E and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the door lock/window switch.

6. Ignition OFF, connect the X1 harness connector at the RCDLR and disconnect the X6 harness connector at the door lock/window switch.
7. Ignition ON, test for greater than 9 volts between the signal circuit terminal E and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RCDLR.

8. If all circuits test normal, test or replace the exterior door handle.

Door Handle Lift Switch Malfunction Without RPO UHA/UHF

1. Ignition OFF, disconnect the harness connector at the appropriate exterior door handle 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. Test for less than 10 ohms between the ground circuit terminal F and ground.

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

4. Ignition ON, test for greater than 9 volts between the signal circuit terminal B and ground.

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

5. Test for greater than 9 volts between the signal circuit terminal E and ground.

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

6. If all circuits test normal, test or replace the exterior door handle.

Door Handle Switch Test

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

⇒	If not the specified value, replace the exterior door handle.

3. Test for less than 2 ohms between the signal terminal E and the ground terminal F with the switch in the closed position.
4. If greater than the specified range, replace the exterior door handle.

Relay Test

1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohms between terminals 85 and 86.

⇒	If not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

⇒	If less than the specified value, replace the relay.

4. Test for less than 2 ohms between terminals 30 and 87A.

⇒	If greater than the specified range, replace the relay.

5. Install a 3-amp fused jumper wire between the relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.

⇒	If greater than specified range, replace the relay.

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.

Power Door Latch System Malfunction RPO EXP

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.

When either exterior door handle is lifted, switched ground signals are sent to the driver door module (DDM) or front passenger door module (PDM) and the remote control door lock receiver (RCDLR) through the LF or RF door handle switch signal circuits. Upon receipt of these inputs, the DDM or PDM and the RCDLR will check the status of the power door lock system. Control of the power door latches is dependent on the door lock status. If the status of the door lock system is UNLOCK, the power door latches will electrically release after lifting the exterior door handle. If the status of the door lock system is LOCK, one of the following inputs will be required before the latch will release.

Once the enable criteria has been met, the DDM or PDM will supply power and ground to the door latch motor control circuits and the door will release.

Important: Using the power door unlock switch or manually unlocking the doors does not disable the content theft deterrent (CTD) arm mode. Also, disconnecting the battery or pulling fuses does not disable the arm mode, since the BCM stores the CTD mode status in memory.

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

1. Ignition ON, command the doors to LOCK and UNLOCK by using the driver and passenger door lock switches, the doors should perform the LOCK and UNLOCK command from both switches.

⇒	If the driver door lock switch is inoperative, refer to Driver Door Lock Malfunction.

⇒	If the passenger door lock switch is inoperative, refer to Passenger Door Lock Malfunction.

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

2. With the doors unlocked, open the driver and passenger doors by using their respective exterior door handles. The driver and passenger doors should release and open when using the exterior door handles.

⇒	If either door does not release, refer to Exterior Door Handle Switch Malfunction With RPO UHA/UHF.

⇒	If either door does not release, refer to Exterior Door Handle Switch Malfunction Except RPO UHA/UHF

3. Command the deadbolt latches to LOCK and UNLOCK with a scan tool. The deadbolt latches should perform the LOCK and UNLOCK function.

⇒	If a deadbolt latch does perform the LOCK or UNLOCK function, refer to Door Lock Deadbolt Malfunction.

Driver Door Lock Malfunction

1. Ignition OFF, disconnect the X1 harness connector at the DDM.
2. Test for less than 10 ohms 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 terminal 4 and ground.

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

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

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

6. Test for less than 5 ohms between the control circuit terminal 4 and ground.

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

7. Connect a test lamp between the control circuit terminal 3 and the control circuit terminal 4.
8. Ignition ON, command the driver door latch to LOCK and UNLOCK by using the driver door lock switch, the test lamp should briefly illuminate during the LOCK and UNLOCK command.

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

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 PDM.
2. Test for less than 10 ohms 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 terminal 4 and ground.

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

4. Ignition OFF, connect the X1 harness connector at the PDM and disconnect the harness connector at the passenger door latch.
5. Test for less than 5 ohms between the control circuit terminal 8 and ground.

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

6. Test for less than 5 ohms between the control circuit terminal 9 and ground.

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

7. Connect a test lamp between the control circuit terminal 8 and the control circuit terminal 9.
8. Ignition ON, command the passenger door latch to LOCK and UNLOCK by using the passenger door lock switch, the test lamp should briefly illuminate during the LOCK and UNLOCK command.

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

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

Rear Door Lock Malfunction

1. Ignition OFF, disconnect the UNLCK relay.
2. Test for less than 20 ohms between the ground circuit terminal 87A and ground.

⇒	If greater than the specified range, test the ground circuit for a short to voltage or an open/high resistance.

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

•	B+ circuit terminal 86

•	B+ circuit terminal 87

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

4. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.
5. Command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.

⇒	If the test lamp does not illuminate, 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 continuously illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

6. Ignition OFF, connect the UNLCK relay and disconnect the LCK relay.
7. Test for less than 20 ohms between the ground circuit terminals listed below and ground:

•	Ground circuit terminal 86

•	Ground circuit terminal 87A

⇒	If greater than the specified range, test the ground circuit for a short to voltage or an open/high resistance.

8. Connect a test lamp between the ground circuit terminal 86 and the control circuit terminal 85.
9. Command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.

⇒	If the test lamp does not illuminate, 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 continuously illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

10. Ignition OFF, connect the LCK relay and disconnect the X2 harness connector at the theft deterrent alarm.
11. Test for less than 20 ohms between the control circuit terminal D and ground.

⇒	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, test or replace the LCK relay.

12. Connect a test lamp between the control circuit terminal D and ground.
13. Command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.

⇒	If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the LCK relay.

⇒	If the test lamp continuously illuminates, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the LCK relay.

14. Ignition OFF, connect X2 harness connector at the theft deterrent alarm and disconnect the harness connector at the appropriate rear door latch.
15. Test for less than 20 ohms between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 2

•	RR door latch control circuit terminal 5

⇒	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, test or replace the UNLCK relay.

16. Test for less than 20 ohms between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 3

•	RR door latch 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 theft deterrent alarm.

17. Connect a test lamp between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 2

•	RR door latch control circuit terminal 5

18. Command the doors to UNLOCK with a scan tool. The test lamp should briefly illuminate during the UNLOCK command.

⇒	If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the UNLCK relay.

⇒	If the test lamp continuously illuminates, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the UNLCK relay.

19. Connect a test lamp between the control circuit terminal listed below and ground:

•	LR door latch control circuit terminal 3

•	RR door latch control circuit terminal 6

20. Command the doors to LOCK with a scan tool. The test lamp should briefly illuminate during the LOCK command.

⇒	If the test lamp does not illuminate, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the theft deterrent alarm.

⇒	If the test lamp continuously illuminates, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the theft deterrent alarm.

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

Exterior Door Handle Switch Malfunction With RPO UHA/UHF

1. Ignition OFF, disconnect the harness connector at the appropriate door handle switch.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:

•	Ground circuit terminal C

•	Ground circuit terminal F

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

3. Ignition ON, test for greater than 10 volts between the signal circuit terminal B and ground.

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

4. Ignition OFF, disconnect the X1 harness connector at the RCDLR.
5. Ignition ON, test for greater than 10 volts between the signal circuit terminal E and ground.

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

6. Ignition OFF, connect the X1 harness connector at the RCDLR and disconnect the X6 harness connector at the door module.
7. Ignition ON, test for greater than 10 volts between the signal circuit terminal E and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, RCDLR.

8. If all circuits test normal, test or replace the exterior door handle switch.

Door Handle Lift Switch Malfunction Except RPO UHA/UHF

1. Ignition OFF, disconnect the harness connector at the appropriate door handle switch.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:

•	Ground circuit terminal C

•	Ground circuit terminal F

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

3. Ignition ON, test for greater than 10 volts between the signal circuit terminal B and ground.

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

4. Test for greater than 10 volts between the signal circuit terminal E and ground.

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

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

Door Lock Deadbolt Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Test for infinite resistance between the control circuit terminal listed below and ground:

•	Driver door latch control circuit terminal 1

•	Passenger door latch control circuit terminal 6

•	Left rear door latch control circuit terminal 1

•	Right rear door latch control circuit terminal 4

⇒	If not the specified value, test the control circuit for a short to ground. If the circuit tests normal, replace the theft deterrent alarm.

3. Test for less than 20 ohms between the control circuit terminal listed below and ground:

•	Driver door latch control circuit terminal 2

•	Passenger door latch control circuit terminal 7

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

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

•	Driver door latch control circuit terminal 1 and control circuit terminal 2

•	Passenger door latch control circuit terminal 6 and control circuit terminal 7

•	Left rear door latch control circuit terminal 1 and control circuit terminal 2

•	Right rear door latch control circuit terminal 4 and control circuit terminal 5

5. Command the door deadbolts 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 theft deterrent alarm.

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

Relay Test

1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohms between terminals 85 and 86.

⇒	If not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

⇒	If less than the specified value, replace the relay.

4. Test for less than 2 ohms between terminals 30 and 87A.

⇒	If greater than the specified range, replace the relay.

5. Install a 3-amp fused jumper wire between the relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87.

⇒	If greater than specified range, replace the relay.

Door Latch Assembly 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 1

•	Driver door latch control terminal 3

•	Passenger door latch control terminal 6

•	Passenger door latch control terminal 8

•	Left rear door latch control terminal 1

•	Left rear door latch control terminal 3

•	Right rear door latch control terminal 4

•	Right rear door latch control terminal 6

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

•	Driver door latch control terminal 2

•	Passenger door latch control terminal 9

•	Passenger door latch control terminal 7

•	Left rear door latch control terminal 2

•	Right rear door latch control terminal 5

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

4. Reverse the jumper wires; the door latch assembly 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.