Brake Switch - TCC: Description and Operation

Brake On/Off Switch:

Brake On/Off (BOO) Switch

Description

The Brake On/Off switch tells the PCM when the brakes are applied. The switch is closed when the brakes are applied and open when they are released.

Transmission Function:

Disengage torque converter clutch when brake is applied.

Symptoms:

Failed ON-torque converter clutch will not engage at less than one-third throttle.
Failed OFF or not connected-torque converter clutch will not disengage when brake is applied.

DTC: 536 (three digit) code. Refer to Manufacturer Code Charts