Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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 body electrical center (BEC). The relay then engages and applies voltage to all the door lock 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

Power Door Systems 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. Disconnect the Lock relay in the BEC. Verify the DTC resets.

⇒	If the DTC does not reset, replace the Relay.

2. Disconnect the BEC connector C1. Verify the DTC resets.

⇒	If the DTC does not reset, replace the BEC.

3. Test for a short to ground in the door lock relay control circuit.

⇒	If all circuits/connections test normal, replace the BCM.

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.