Normal Operation
WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
When the key is turned to the UNLOCK position in the driver door lock cylinder, the door disarm switch provides a ground signal to the smart junction box (SJB) on circuit CPL28 (VT/BN). With this signal, the SJB will disarm the perimeter alarm, thereby allowing entry without activating the alarm.
DTC B2100 - sets when there is a short to ground in the circuit between the door disarm switch and the SJB.
Possible Causes
- Circuitry
- Door disarm switch (part of the driver door latch)
- SJB