Brake Signal: Description and Operation

COMPONENT
Brake ON/OFF (BOO) switch

FUNCTION
Sends a battery voltage signal to PCM when depressing brake pedal.
PCM adjusts or controls the following:
1. Maintains idle speed with brake applied
2. A/C compressor ON/OFF
3. Disengages torque converter clutch

REMARKS
If all stoplamp bulbs are open, a high voltage is present at PCM due to a pull-up resistor in PCM. This provides fail safe function in event circuit to BOO switch has failed.