Normal Operation
WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
The Body Control Module (BCM) sends voltage signals to the door lock control switches through the lock and unlock input circuits. When the lock or unlock switch is pressed, the corresponding voltage signal is routed to ground. The door lock control switches have a dedicated ground circuit. The BCM sends the lock or unlock request from the door lock control switch to the Remote Function Actuator (RFA) module over the Medium Speed Controller Area Network (MS-CAN).
- DTC B126A:01 (Drivers Door Interior Lock Switch: General Electrical Failure) - sets when the BCM detects a short to ground from the lock or unlock request input circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door lock control switch
- BCM