Operation

OPERATION

The brake lamp switch controls two independent circuits. These circuits are described as follows:

- Brake Lamp Switch Circuit - A normally open brake lamp switch circuit receives a battery voltage input, and supplies this battery voltage to the Controller Antilock Brake (CAB) (also known as the Antilock Brake System/ABS or Electronic Stability Program/ESP controller) on a brake lamp switch output circuit only when the brake pedal is depressed (brake lamp switch plunger released).
- Brake Lamp Switch Signal Circuit - A normally closed speed control circuit receives a battery voltage input, and supplies this battery voltage to the Controller Antilock Brake (CAB) (also known as the Antilock Brake System/ABS or Electronic Stability Program/ESP controller) on a brake lamp switch sense circuit only when the brake pedal is released (brake lamp switch plunger is depressed).

The brake lamp switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.