Power Door Locks Inoperative
Power Door Locks Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
When any of the door lock switches are placed in the lock position, a ground signal is applied to the BCM through the door lock signal circuit. Upon receiving this signal, the BCM grounds the control side of the door lock relay through the door lock relay control circuit. Since the other side of the door lock relay winding is connected to battery voltage, the relay is energized. This causes the contacts to close and complete the path from the DOOR LKS fuse through the battery voltage circuit. Voltage is then applied to the lock side of the door lock actuators through the door lock actuator lock circuits. Since the other side of the all the door lock actuators are connected to the normally closed contacts of their respective unlock relays to ground, the doors lock.
Circuit/System Verification
1. Ignition ON, observe the Driver Door Lock Sw or Psgr Door Lock Sw and Driver Door Unlock Sw or Psgr Door Unlock Sw parameters while using the appropriate door lock switch. The parameter should change from Inactive to Active.
• If the parameter does not change between commanded states, refer to Door Lock Switch Malfunction.
2. Command the driver door and passenger door lock actuators to LOCK and UNLOCK by using the door lock switch, the doors should LOCK and UNLOCK.
• If the driver, passenger or cargo door lock actuator does not LOCK or UNLOCK, refer to Door Lock Malfunction.
• If a sliding door does not LOCK or UNLOCK, refer to Sliding Door Lock Malfunction.
Circuit/System Testing
Door Lock Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for less than 1 ohm between the ground circuit terminal and ground listed below:
* Driver door lock switch ground terminal A
* Passenger door lock switch ground terminal A
* Rear cargo door lock switch ground terminal(TM)E
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify the scan tool Door Lock Switch parameter is Inactive.
• If not the specified parameter, test the signal circuit terminal listed below for a short to ground:
* Driver door lock switch signal terminal F
* Passenger door lock switch signal terminal F
* Rear cargo door lock switch signal terminal A
• If the circuit tests normal, replace the BCM.
4. Verify the scan tool Door Unlock Switch parameter is Inactive.
• If not the specified parameter, test the signal circuit terminal listed below for a short to ground:
* Driver door lock switch signal terminal G
* Passenger door lock switch signal terminal G
* Rear cargo door lock switch signal terminal D
• If the circuit tests normal, replace the BCM.
5. Install a 3-amp fused jumper wire between ground and the signal circuit terminal listed below:
* Driver door lock switch signal terminal F and A.
* Passenger door lock switch signal terminal F and A.
* Rear cargo door lock switch signal terminal A and E.
6. Verify the scan tool Door Lock Switch parameter is Active.
• If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
7. Install a 3-amp fused jumper wire between ground and the signal circuit terminal listed below:
* Driver door lock switch signal terminal G and A.
* Passenger door lock switch signal terminal G and A.
* Rear cargo door lock switch signal terminal D and E.
8. Verify the scan tool Door Lock Switch parameter is Active.
• If not the specified parameter, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
9. If all circuits test normal, test or replace the door lock switch.
Door Lock Malfunction
1. Ignition OFF, disconnect the X1 harness connector at the body fuse block.
2. Test for less than 1 ohm between the ground circuit terminal 21 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the appropriate control circuit terminal listed below and B+:
* Control circuit terminal 11
* Control circuit terminal 18
4. Ignition ON, command the doors to LOCK and UNLOCK by using the door lock switch. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
• 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 BCM.
5. Connect a test lamp between the appropriate control circuit terminal listed below and ground:
* Control circuit terminal 19
* Control circuit terminal 5
6. Command the doors to LOCK and UNLOCK by using the door lock switch. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to ground or and open/high resistance. If the circuit tests normal, replace the BCM.
7. Ignition OFF, connect the harness connector at the body fuse block and disconnect the harness connector at the appropriate door latch assembly.
8. Test for less than 1 ohm between the control circuit terminal A 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 body fuse block.
9. Test for less than 1 ohm between the control circuit terminal B 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 body fuse block.
10. Connect a test lamp between control circuit terminal A and B of the door latch assembly.
11. Ignition ON, command the door latch to LOCK and UNLOCK by using the door lock switch. The test lamp should turn ON when commanding the LOCK and UNLOCK states.
• If the test lamp is always OFF during either of the commands, test for a short to ground on both control circuits. If the circuits test normal, replace the body fuse block.
• If the test lamp is always ON, test for a short to voltage on both control circuits. If the circuits test normal, replace the body fuse block.
12. If all circuits test normal, test or replace the door latch assembly.
Sliding Door Lock Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate door contact plate.
2. Test for less than 1 ohm between the control circuit terminal B and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.
3. Test for less than 1 ohm between the control circuit terminal A and ground.
• If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance.
4. Connect a test lamp between control circuit terminal B and control circuit terminal A.
5. Ignition ON, command the doors to LOCK and UNLOCK by using the door lock switch. 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 or an open/high resistance on either control circuit.
6. Ignition OFF, connect the harness connector at the door contact plate and close the sliding door.
7. Disconnect the harness connector at the door latch assembly.
8. Test for less than 1 ohm between the control circuit terminal B 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 door contact plate.
9. Test for less than 1 ohm between the control circuit terminal A 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 door contact plate.
10. Connect a test lamp between control circuit terminal B and control circuit terminal A.
11. Ignition ON, command the doors to LOCK and UNLOCK by using the door lock switch. 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 or an open/high resistance on either control circuit. If the circuits test normal, replace the door contact plate.
12. If all circuits test normal, test or replace the door latch assembly.
Component Testing
Door Lock Switch Test
1. Ignition OFF, disconnect the harness connector at the appropriate door lock switch.
2. Test for infinite resistance between the signal terminals and the ground terminal listed below with the switch in the inactive position:
* Driver door lock switch terminal F and A
* Driver door lock switch terminal G and A
* Passenger door lock switch terminal F and A
* Passenger door lock switch terminal G and A
* Rear cargo door lock switch terminal A and E
* Rear cargo door lock switch terminal D and E
• If less than the specified value, replace the door lock switch.
3. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the switch in the lock position:
* Driver door lock switch terminal F and A
* Passenger door lock switch terminal F and A
* Rear cargo door lock switch terminal A and E
• If greater than the specified value, replace the door lock switch.
4. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the switch in the unlock position:
* Driver door lock switch terminal G and A
* Passenger door lock switch terminal G and A
* Rear cargo door lock switch terminal D and E
• If greater than the specified value, replace the door lock switch.
Door Lock Actuator Test
1. Ignition OFF, disconnect the harness connector at the appropriate door latch assembly.
2. Ignition ON, install a 10-amp fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The door latch assembly should perform the LOCK/ UNLOCK function.
• If the function does not perform as specified, replace the door latch assembly.
3. Reverse the jumper wires; the door latch assembly should perform the UNLOCK/LOCK function.
• If the function does not perform as specified, replace the door latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
* Power Door Lock Actuator Replacement
* Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)
* Door Lock Switch Replacement
* Sliding Door Jamb Contact Plate Replacement