See Figures 1 and 2
The stop light switch, referred to as the stoplight or Brake On/Off (BOO) switch by the manufacturer, turns power on and off to the rear brake lamps when the brake pedal is depressed. The BOO switch also provides reference signals to the Anti-lock Brake System Control Module (ABS-CM), the Powertrain Control Module (PCM), the shift lock actuator, and the speed control servo (if equipped).
REMOVAL & INSTALLATION
- Detach the wiring harness connector from the BOO switch by using a small pick or prytool to lift the connector retaining tab up, then pulling the connector from the switch.
Since the side plate of the BOO switch nearest the brake pedal is slotted, it is not necessary to remove the brake master cylinder pushrod and one spacer from the brake pedal pin.
- Disengage the hairpin retainer, then slide the BOO switch, pushrod, nylon washers and bushing away from the brake pedal. Detach the BOO switch from the bracket by sliding it up or down.
- Position the BOO switch so that the U-shaped side is nearest the brake pedal and directly over the pin. Slide the switch down until it has trapped the master cylinder pushrod and blade bushing between its sideplates.
- Press the BOO switch and pushrod firmly toward the brake pedal arm, then assemble the outside white nylon washer to the pin.
- Install the hairpin retainer to securely hold the entire assembly.
The BOO switch wiring harness must have sufficient slack to allow brake pedal movement. After attaching the connector to the switch, ensure that there is enough play in the harness.
- Insert the wiring harness connector into the BOO switch connector until the retaining tab is fully engaged.
- Have an assistant sit in the vehicle and apply the brake pedal while you watch the brake lamps for proper function. The brake lights should illuminate even with the ignition switch in the OFF position. If they do not illuminate when the pedal is depressed, there is a problem within the switch or circuit.