Brakelight Switch

The Brakelight switch is wired to brakelight circuit and Powertrain Control Module (PCM). Brakelight switch is located above brake pedal and signals PCM when the brake pedal is applied. Brakelight switch input signal is used primarily for torque converter clutch lock/unlock strategy, cruise (speed) control and auxiliary idle control (if equipped). If all brakelights burn out, a pull-up resistor in the PCM provides high voltage at PCM for fail-safe operation.