Power Door Latch System Malfunction
Power Door Latch System Malfunction
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
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.
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. Test for less than 1.0 ohm of resistance between the ground circuit terminal C and ground.
• 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 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 3-A 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 3-A 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 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.
Circuit/System Testing
Door Latch Inoperative from Interior Door Handle Switch
1. Ignition OFF, disconnect the harness connector at the inoperative interior door handle switch.
2. Test for less than 1.0 ohm of resistance between the ground circuit terminal A and ground.
• 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 3-A 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 3-A 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 after completing the diagnostic procedure. Verification Tests
* Door Lock Replacement.
* Door Outside Handle Replacement.
* Control Module References for BCM, DDM, DDSA or PDM replacement, setup, and programming. Programming and Relearning