Brake On/Off (BOO Switch)

DESCRIPTION
The brake On/Off (BOO) switch signals the powertrain control module when the brakes are applied. The stoplight switch is closed when the brakes are depressed and open when they are released. The switch will also disengage torque converter clutch (TCC) when brake is applied.

SYMPTOMS
- Failed ON: TCC 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's
P0703, P1703