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Power Door Locks Malfunction (AXC/AXE)




Power Door Locks Malfunction (AXC/AXE)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information





Circuit/System Description

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 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.

Reference Information
Schematic Reference

Door Lock/Indicator Schematics (except AXE) (Door Lock/Indicator Schematics (except AXE)) Door Lock/Indicator Schematics (AXE) (Door Lock/Indicator Schematics (AXE))
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Door Locks Description and Operation (AXA) (Power Door Locks Description and Operation (AXA)) Power Door Locks Description and Operation (AXC/AXE) (Power Door Locks Description and Operation (AXC/AXE))
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Programming and Relearning (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the scan tool Driver Door Switch Door Lock Actuator Cmd. parameter while using the driver door lock/window switch and Passenger Door Switch Door Lock Actuator Cmd. parameter while using the passenger door lock/window switch. The parameters for each switch should change from Off to Lock and Unlock.

• If the parameters do not change, replace the appropriate door lock/window switch.

2. Command the Driver Door Switch Door Lock/Unlock with a scan tool, the driver door should LOCK and UNLOCK while changing between the commanded states.

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

3. Command the Passenger Door Switch Door Lock/Unlock with a scan tool, the passenger door should LOCK and UNLOCK while changing between the commanded states.

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

4. Command the Lock All Doors and Passenger Door(s) Unlock with a scan tool, the left rear and right rear doors should LOCK and UNLOCK while changing between the commanded states.

• If a rear door does not LOCK, refer to Door Lock Relay Malfunction
• If a rear door does not UNLOCK, refer to Door Unlock Relay Malfunction

Circuit/System Testing

Driver Door Lock Malfunction
1. Ignition OFF, disconnect the harness connector at the driver door latch.
2. Test for less than 2 ohm 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 driver door lock/window switch.

3. Test for less than 2 ohm 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 driver door lock/window switch.

4. Ignition ON, connect a test lamp between the control circuit terminal 3 and control circuit terminal 2.
5. Command the Door Lock/Unlock with a scan tool. 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 driver door lock/window switch.

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

Passenger Door Lock Malfunction
1. Ignition OFF, disconnect the harness connector at the passenger door latch.
2. Test for less than 2 ohm 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 passenger door lock/window switch.

3. Test for less than 2 ohm 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 passenger door lock/window switch.

4. Ignition ON, connect a test lamp between the control circuit terminal 5 and control circuit terminal 6.
5. Command the Door Lock/Unlock with a scan tool. 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 passenger door lock/window switch.

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

Door Unlock Relay Malfunction
1. Ignition OFF, disconnect the UNLOCK relay.
2. Test for less than 1 ohm between the ground circuit terminal 87A 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 does not illuminate between the control circuit terminal 30 and ground.

• If the test lamp illuminates, test the control circuit for a short to voltage.

4. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the UNLOCK relay.

5. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.

• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

6. Connect a test lamp between the control circuit terminal 85 and the B+ circuit terminal 86.
7. Command the driver door to UNLOCK by using the driver door lock/window switch. The test lamp should illuminate when commanding the UNLOCK state.

• 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. Ignition OFF, connect the UNLOCK relay and disconnect the harness connector at the driver door latch.
9. Test for less than 5 ohm between the control circuit terminal listed below and ground:

* Left rear door latch terminal 2.
* Right rear door latch terminal 5.

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

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

* Left rear door latch terminal 2.
* Right rear door latch terminal 5.

11. Ignition ON, command the Passenger Door(s) Unlock with a scan tool. The test lamp should turn ON when commanding the UNLOCK state.

• If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the UNLOCK relay.

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

Door Lock Relay Malfunction
1. Ignition OFF, disconnect the LCK relay.
2. Test for less than 1 ohm between the ground circuit terminal 87A 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 does not illuminate between the control circuit terminal 30 and ground.

• If the test lamp illuminates, test the control circuit for a short to voltage.

4. Verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the LCK relay.

5. Verify that a test lamp illuminates between the B+ circuit terminal 87 and ground.

• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.

6. Connect a test lamp between the circuit terminal 85 and the B+ circuit terminal 86.
7. Command the rear doors unlock ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

• 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. Ignition OFF, connect the LCK relay and disconnect the harness connector at the appropriate door latch.
9. Test for less than 5 ohm between the control circuit terminal of the door lock listed below and ground:

* Left rear door latch terminal 3.
* 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 circuits test normal, replace the LCK relay.

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

* Left rear door latch terminal 3.
* Right rear door latch terminal 6.

11. Ignition ON, command the Lock All Doors with a scan tool. The test lamp should turn ON when commanding the LOCK state.

• If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the LCK relay.

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

Component Testing

Door Latch
1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Install a 25 A fused jumper wire between one of the control terminals and 12 V. 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.

Relay Test
1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohm 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 ohm between terminals 30 and 87A.

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

5. Install a 3 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohm between terminals 30 and 87.

• If greater than specified range, replace the relay.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Front Side Door Latch Replacement (Service and Repair)
* Rear Side Door Latch Replacement (Service and Repair)
* Relay Replacement (Attached to Wire Harness) (Service and Repair)
* Control Module References (Programming and Relearning) for BCM, driver door lock/window switch or passenger door lock/window switch replacement, setup and programming

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