Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The brake switch indicates brake pedal status to the transmission control module (TCM). The normally-closed brake switch supplies ignition voltage to the TCM. Applying the brake pedal opens the switch, interrupting voltage to the TCM. Releasing the brake pedal resumes voltage to the TCM. When the TCM senses 0 volts at the brake switch input, the TCM de-energizes the torque converter clutch (TCC) solenoid valve.
When the TCM detects a closed brake switch, stuck ON, during accelerations, then DTC P0724 sets. DTC P0724 is a type C DTC.