Normal Operation
WARNING: This page is about a different car, the 2005 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) sends a signal through circuit 248 (TN/OG) to the speed control switches, which passes through the clockspring. The return signal is sent to the PCM through circuit 133 (BK) and the clockspring. When the brake pedal is applied the smart junction box (SJB) sends a message to the PCM to deactivate the speed control if engaged.
The speed control deactivator switch interrupts circuit 535 (LB/RD) removing the voltage signal to the PCM when the brake pedal is applied firmly and passes the stoplamp switch trip point. This is a redundant signal to the PCM.