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 body control module (BCM) detects a transition of either of the door lock switches to the LOCK position, it switches the door lock actuator lock control circuit to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the door lock actuators transitions to the LOCK position and when the BCM detects a transition of either of the door lock switches to the UNLOCK position, it switches the door lock actuator unlock control circuit to voltage. Since the door lock actuator unlock control circuit is at ground potential within the BCM, the door lock actuators transitions to the UNLOCK position.
The driver door lock actuator unlock control circuit is a dedicated control circuit used only for the driver door lock actuator motor. This is done so that the driver door may be unlocked by itself using a keyless entry transmitter or an automatic door unlock function, if programmed.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics (Door Lock/Indicator 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
1. Ignition ON, observe the scan tool RF Door Lock Switch and RF Door Unlock Switch parameters while using the passenger door lock switch. The reading should change between Active and Inactive.
• If the reading does not change, refer to Passenger Door Lock Switch Malfunction.
2. Command all doors LOCK and UNLOCK by using the driver door lock switch. All doors should lock and unlock.
• If the doors do not LOCK/UNLOCK refer to Driver Door Lock Switch Malfunction.
3. Command the Driver Door Unlock ON and OFF with a scan tool. The driver door should unlock.
• If the driver door does not unlock, refer to Driver Door Lock Malfunction.
4. Command the Unlock All Doors ON and OFF with a scan tool. All doors should unlock.
• If one or more vehicle doors do not unlock, refer to Door Lock Malfunction.
5. Command the Lock All Doors ON and OFF with a scan tool. All doors should lock.
• If one or more vehicle doors do not lock, refer to Door Lock Malfunction.
Circuit/System Testing
Passenger Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the front passenger door lock switch.
2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool RF Door Lock 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 BCM.
4. Verify the scan tool RF Door Unlock Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.
5. Install a 3-amp fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool RF Door Lock 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 BCM.
6. Install a 3-amp fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool RF Door Unlock 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 BCM.
7. If all circuits test normal, test or replace the passenger door lock switch.
Driver Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the front driver door lock switch.
2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal B and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool All Door Lock Motors parameter is Off.
• If not the specified value, test the signal circuit terminal D for a short to ground. If the circuit tests normal, replace the BCM.
4. Verify the scan tool Passenger Door Unlock Motors parameter is Off.
• If not the specified value, test the signal circuit terminal E for a short to ground. If the circuit tests normal, replace the BCM.
5. Install a 3-amp fused jumper wire between the signal circuit terminal D and ground. Verify the scan tool All Door Lock Motors parameter is On.
• 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 BCM.
6. Install a 3-amp fused jumper wire between the signal circuit terminal E and ground. Verify the scan tool Passenger Door Unlock Motors parameter is On.
• 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 BCM.
7. If all circuits test normal, test or replace the driver door lock switch.
Driver Door Lock Malfunction
1. Ignition OFF, disconnect the harness connector at the driver door lock actuator.
2. Ignition ON, connect a test lamp between control circuit terminal 3 and control circuit terminal 2.
3. Command the driver door to LOCK and UNLOCK using a scan tool. The test lamp should illuminate when changing between the commanded states.
• If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the BCM.
4. If all circuits test normal, test or replace the driver door lock.
Door Lock Malfunction
1. Ignition OFF, disconnect the X2 harness connector at the BCM.
2. Ignition OFF, test for less than 1 ohm between the ground circuit terminal 50 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 49 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or open/high resistance.
4. Ignition OFF, connect the BCM and disconnect the harness connector at the appropriate passenger door lock.
5. Ignition ON, connect a test lamp between the control circuit terminals of the appropriate door lock listed below.
* Front passenger door lock terminals 5 and 6
* LR passenger door lock terminals 2 and 3
* RR passenger door lock terminals 5 and 6
6. Command all doors to LOCK and UNLOCK using a scan tool. The test lamp should illuminate when changing between the commanded states.
• If the test lamp remains OFF during either of the commands, test for a short to ground or an open/high resistance on either control circuit. If the circuits test normal, replace the BCM.
7. If all circuits test normal, test or replace the appropriate passenger door lock.
Component Testing
Door Lock Switch
1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for infinite resistance between the signal terminal E and D and the ground terminal B with the switch in the open position.
• If not the specified value, replace the appropriate door lock switch.
3. Test for less than 2.0 ohms between the signal terminal E and the ground terminal B with the switch in the UNLOCK position.
• If greater or less than the specified range, replace the appropriate door lock switch.
4. Test for less than 2.0 ohms between the signal terminal D and the ground terminal B with the switch in the LOCK position.
• If greater than the specified range, replace the appropriate door lock switch.
Door Lock
1. Install a 15-amp fused jumper wire between the lock control terminal and 12 volts. Momentarily install a jumper wire between the unlock control terminal and ground. The appropriate door lock should perform the LOCK/ UNLOCK function.
• If the function does not perform as specified, replace the appropriate door lock.
2. Reverse the jumper wires; the appropriate door lock should perform the UNLOCK/LOCK function.
3. If the function does not perform as specified, replace the appropriate door lock.
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