Principles of Operation: Notes

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).

The Body Control Module B (BCM-B) monitors the input from the stoplamp switch. When the brake pedal is applied, voltage is routed to the BCM-B. The BCM-B then supplies voltage to the rear stoplamps and high mounted stoplamp.

The ABS module can also send a command to turn the stoplamps on. During an event (such as stability assist) where the ABS module applies the brakes, the ABS module sends a message over the Medium Speed Controller Area Network (MS-CAN) to the BCM-B to turn the stoplamps on.