Power Door Locks Inoperative - Rear

Power Door Locks Inoperative - Rear

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 rear door lock actuators are controlled by the body control module (BCM) through the LOCK and UNLOCK relays, and the relays are controlled by the BCM through low side drive control circuits.

Reference Information
Schematic Reference

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

Component Connector End Views (Component Connector End Views)
Description and Operation

Power Door Locks Description and Operation (Description and Operation)
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

Control Module References (Control Module References) for scan tool information

Circuit/System Verification

Command the rear doors to Lock and Unlock with a scan tool. The rear doors should lock and unlock.

Circuit/System Testing

1. Disconnect the harness connector at the affected door latch.
2. Test for less than 1.0 ohm between the actuator control circuit terminal A and ground.

• If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal replace the UNLOCK relay.

3. Test for less than 1.0 ohm between the actuator control circuit terminal B and ground.

• If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal replace the LOCK relay.

4. Connect a test lamp between the control circuit terminal A and the control circuit terminal B.
5. Command the rear doors Locked and Unlocked with a scan tool. The test lamp should flash when changing between the commanded states.

• If the test lamp does not flash during both commanded states, replace the affected relay.

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

Repair Instructions

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

Rear Side Door Latch Replacement (Service and Repair)