Circuit Description
WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The brake switch indicates brake pedal status to the PCM. The normally-closed brake switch supplies ignition voltage 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 0 volts at the brake switch input, the PCM de-energizes the torque converter clutch (TCC) solenoid valve.
When the PCM detects an open brake switch, stuck ON, during accelerations, then DTC P0719 sets. DTC P0719 is a type C DTC.