Power Door Latch System Malfunction
Power Door Latch System Malfunction
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
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 End Views By Name)
Description and Operation
Power Door Latch 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 (Programming and Relearning) for scan tool information
Circuit/System Testing
Door Latch Inoperative from Exterior Door Handle Switch
1. Ignition OFF, disconnect the harness connector at the appropriate exterior door handle switch.
2. 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 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 door control module.
4. Verify the 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 scan tool Exterior Door Handle switch 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 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 Exterior Door Handle Switch 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 RCDLR.
7. If all circuits test normal, test or replace the exterior door handle switch.
Door Latch Inoperative from Interior Door Handle Switch
1. Ignition OFF, disconnect the harness connector at the appropriate interior door handle switch.
2. 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 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 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 scan tool Interior Door Handle Switch 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 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 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 interior door handle switch.
Door Latch Inoperative from All Door Handle Switches
1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
2. Connect a test lamp between the control circuit terminal listed below and ground.
* Driver door latch control circuit terminal 3
* Passenger door latch control circuit terminal 8
3. Ignition ON, command the door latch by using the 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 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.
4. Connect a test lamp between the control circuit terminals listed below.
* Driver door latch control circuit terminal 3 and latch enable control circuit terminal 4
* Passenger door latch control circuit terminal 8 and latch enable control circuit terminal 9
5. Ignition ON, command the door latch by using the 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 control circuit for a short to ground. If the circuit tests normal, replace the RCDLR.
• 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 RCDLR.
6. If all circuits test normal, test or replace the door latch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Door Lock Replacement (Door Lock Replacement)
* Door Latch Release Switch Outside Bezel Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM, DDM, DDSA or PDM replacement, setup, and programming