Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

On vehicles without the memory feature, the driver door disarm switch provides a ground signal to the smart junction box (SJB) through circuit CPL28 (VT/BN), the switch, and ground circuit GD126 (BK/WH) allowing entry without activating the alarm. The switch must operate before the mechanical lock unlocks. This is to prevent the anti-theft alarm from activating when it should have been disarmed.

On vehicles with the memory feature, the driver door disarm switch provides a ground signal to the driver door module (DDM) through circuit CPL28 (VT/BN), the switch, and ground circuit GD126 (BK/WH). The DDM sends a network message to the SJB, which allows entry without setting off the alarm. The switch must operate before the mechanical lock unlocks. This is to prevent the anti-theft alarm from activating when it should have been disarmed.

DTC B2116 (Door Driver Reset Switch Stuck Failure) - sets when there is a short to ground in the circuit between the door lock actuator and the SJB (vehicles without memory), or the DDM (vehicles with memory), or the switch is stuck closed.

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Driver door disarm switch (part of the driver door latch)
DDM (vehicles with memory feature)
SJB