DTC P0724: Brake Switch Circuit - High Input: Description
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
The Torque Converter Clutch (TCC) brake switch is used to indicate the status of the brake pedal, applied or released, to the PCM. The normally-closed TCC brake switch supplies an ignition voltage input to the PCM. Applying the brake pedal opens the switch, interrupting voltage to the PCM. Releasing the brake pedal resumes voltage to the PCM. When the PCM senses zero volts at the TCC brake switch input, the PCM de-energizes the TCC solenoid valve. If the PCM detects a closed TCC brake switch, stuck off, during decelerations, then DTC P0724 sets.