Brake Switch - TCC: Description and Operation

Brake On/Off (BOO) Switch:

DESCRIPTION
The Brake On/0ff switch tells the powertrain control module when the brakes are applied. The switch is closed when the brakes are applied and open when they are released.

FUNCTION
Disengages torque converter clutch when brake is applied.

RELATED SYMPTOMS
Failed on or not connected - Torque converter clutch will not engage at less than 1/3 throttle.
Failed off - Torque converter clutch will not disengage when brake is applied.