Power Door Latch System Malfunction

Power Door Latch System Malfunction

Diagnostic Instructions

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



Diagnostic Fault Information






Circuit/System Description

When the remote control door lock receiver (RCDLR) receives an input from either the driver exterior door handle switch or driver interior door handle switch, it checks the Lock/Unlock status of the driver door. If the status of the driver door is Unlock, the RCDLR applies the ground for the driver power door latch.


At the same time that the RCDLR is receiving its input, the driver door module (DDM) is also receiving the same input. When the DDM receives its input from the door handle switch, it checks the window indexing status of the driver door. If the window is below the index point, it sends a serial data message to the body control module (BCM) to apply voltage for the driver power door latch. If the window is above the index point, it will first index the window, then send a serial data message to the BCM to apply voltage for the driver power door latch.


Reference Information
Schematic Reference

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

Component Connector End Views (Connector Views)
Description and Operation

Power Door Latch Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)


Circuit/System Testing


Door Latch Inoperative from Exterior Door Handle Switch
1. Ignition OFF, disconnect the harness connector at the inoperative exterior door handle switch.
2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal C.

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

3. Ignition ON, verify the appropriate door control module scan tool exterior door handle switch 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 appropriate door control module.

4. Verify the appropriate RCDLR scan tool exterior door handle switch parameter is INACTIVE.

• If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the RCDLR.

5. Install a 3A fused jumper wire between the signal circuit terminal D and ground terminal C. Verify the appropriate door control module scan tool exterior door handle switch parameter is ACTIVE.

• If not the specified value, test the signal circuit terminal D for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door control module.

6. Install a 3A fused jumper wire between the signal circuit terminal A and ground terminal C. Verify the RCDLR scan tool interior door handle switch parameter is ACTIVE.

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

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



Door Latch Inoperative from Interior Door Handle Switch
1. Ignition OFF, disconnect the harness connector at the inoperative interior door handle switch.
2. Ignition OFF, verify that a test lamp illuminates between B+ and the ground circuit terminal A.

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

3. Ignition ON, verify the appropriate door control module scan tool interior door handle switch parameter is INACTIVE.

• If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the appropriate door control module.

4. Verify the appropriate RCDLR scan tool interior door handle switch parameter is INACTIVE.

• If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the RCDLR.

5. Install a 3A fused jumper wire between the signal circuit terminal C and ground terminal A. Verify the appropriate door control module scan tool interior door handle switch parameter is ACTIVE.

• If not the specified value, test the signal circuit terminal C for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door control module.

6. Install a 3A fused jumper wire between the signal circuit terminal B and ground terminal A. Verify the RCDLR scan tool interior door handle switch parameter is ACTIVE.

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

7. If all circuits test normal, test or replace the appropriate interior door handle switch.



Door Latch Inoperative from All Door Handle Switches
1. Ignition OFF, disconnect the harness connector at the inoperative door latch.
2. Connect a test lamp between latch control circuit and ground.
3. Ignition ON, activate the appropriate interior door handle switch. The test lamp should turn ON when activating the door handle switch.

• If the test lamp is always OFF, test the latch 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 latch control circuit for a short to voltage. If the circuit tests normal, replace the BCM.

4. Connect a test lamp between the latch control circuit and latch enable control circuit.
5. Ignition ON, activate the appropriate interior door handle switch. The test lamp should turn ON when activating the door handle switch.

• If the test lamp is always ON, test the latch enable control circuit for a short to ground. If the circuit tests normal, replace the RCDLR.


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

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



Repair Instructions

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

* Door Lock Replacement (Door Lock Replacement)
* Front Side Door Handle Switch Replacement (Service and Repair)
* Door Latch Release Switch Replacement - Driver Side (Service and Repair)
* Door Latch Release Switch Replacement - Passenger Side (Service and Repair)
* Control Module References (Programming and Relearning) for BCM, DDM, DDSA or PDM replacement, setup, and programming