Power Door Locks Inoperative
Power Door Locks Inoperative
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 driver switch assembly detects a transition of either its own door lock switch, the passenger door lock switch or the key cylinder switch to the LOCK position, it switches the door lock actuator lock control circuit to voltage. Since the lock actuator unlock control circuits are at ground potential within the driver switch assembly, the door lock actuator motors transition to the LOCK position.
When the driver switch assembly detects a transition of either its own door lock switch, the passenger door lock switch or the key cylinder switch to the UNLOCK position, it switches the driver door lock actuator unlock control circuit to voltage. Since the door lock actuator lock control circuit is at ground potential within the driver switch assembly, the LF door lock actuator motor transitions to the UNLOCK position.
When the driver switch assembly detects a transition of either its own door lock switch, the passenger door lock switch, or the key cylinder switch to the UNLOCK position, it switches the door lock actuator unlock control circuits to voltage. Since the door lock actuator lock control circuit is at ground potential within the driver switch assembly, the passenger door lock actuator motors transition to the UNLOCK position.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Power Door Locks 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) for Scan Tool Information
Circuit/System Verification
Ignition ON, command the doors to LOCK and UNLOCK while pressing the door lock switch and door unlock switch on the appropriate door lock and window switch.
If the driver door switch and passenger door switch is inoperative, refer to Driver Door Lock Switch Malfunction.
If the passenger door switch is inoperative, refer to Passenger Door Lock Switch Malfunction.
If one or more vehicle doors do not lock or unlock, refer to Door Lock Malfunction.
Circuit/System Testing
Passenger Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the passenger door lock switch.
2. Ignition OFF, test for less than 1.0 ohm for resistance between the ground circuit terminal 5 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition OFF, connector the harness connector at the passenger door lock switch and disconnect the X2 harness connector at the driver door lock switch.
4. Connect a test lamp between the passenger door lock switch lock control circuit terminal 7 and B+.
5. Ignition ON, command the door lock actuators to LOCK by using the passenger door lock switch. The test lamp should turn illuminate while using the door lock switch.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the passenger door lock switch.
• If the test lamp remains OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the passenger door lock switch.
6. Connect a test lamp between the passenger door lock switch unlock control circuit terminal 6 and B+.
7. Ignition ON, command the door lock actuators to UNLOCK by using the passenger door lock switch. The test lamp should turn illuminate while using the door lock switch.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the passenger door lock switch.
• If the test lamp remains OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the passenger door lock switch.
8. If all circuits test normal, replace the driver door lock switch.
Door Lock Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate door lock actuator.
2. Ignition OFF, test for less than 1.0 ohm of resistance 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 switch.
3. Ignition OFF, test for less than 1.0 ohm of resistance between the control circuit terminal 1 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 switch.
4. Connect a test lamp between control circuit terminal 2 and control circuit terminal 3.
5. Ignition ON, command the door lock actuator to LOCK and UNLOCK with a scan tool. The test lamp should turn ON when commanding the LOCK and UNLOCK states.
• If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the driver door lock switch.
6. If all circuits test normal, test or replace the appropriate door lock actuator.
Component Testing
1. Install a 15-amp fused jumper wire between the control terminal 2 and 12 volts. Momentarily install a jumper wire between the control terminal 3 and ground. The appropriate door lock actuator should perform the LOCK function.
• If the function does not perform as specified, replace the appropriate door lock actuator.
2. Reverse the jumper wires; the appropriate door latch should perform the UNLOCK function.
• If the function does not perform as specified, replace the appropriate door lock actuator.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Rear Door Lock Replacement (Rear Door Lock Replacement)
* Front Side Door Lock Replacement (Front Side Door Lock Replacement)
* Control Module References (Programming and Relearning) for BCM replacement, setup, and programming