When the door lock switch is place in to the LOCK position, ground is applied through the switch to the body control module (BCM). The BCM then applies a voltage through the door lock relay control circuit to the coil side of the lock relay in the Instrument Panel Junction Block . The relay then engages and applies voltage to all the door lock actuator assemblies.

The ignition is ON.

The BCM receives a ground signal on the door lock relay control circuit

The BCM cease attempt to lock the doors.

The BCM clears this code from current when the fault is removed from the system.

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Vehicle Access Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, place the door lock switch to the LOCK position. All doors should lock.

1. Ignition OFF, disconnect the C1 harness connector at the IP Fuse Block.
2. Connect a test lamp between the control circuit terminal K4 and B+
3. Command the Power Door Locks ON and OFF with the scan tool. 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 I/P Junction Block

⇒	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.

4. Ignition OFF, Connect the C1 harness connector at the IP fuse block. Disconnect the C2 harness connector at the Door lock actuator.
5. Test for less than 1.0 ohm of resistance between the door lock actuator and ground circuit terminal B and ground.
6. Connect a test lamp between the control circuit terminal A and ground.
7. Command the Power Door Locks ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between 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 IP Fuse Box.

⇒	If the test lamp is always OFF and the circuit fuse is good, test the control circuit for an open / high resistance. If the circuit tests normal, test or replace the IP Fuse Box.

⇒	If the test lamp is always OFF and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal , test or replace the BCM.

8. If all circuits test normal, test or replace the Power Door Lock Actuator.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.