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Brake On/Off (BOO Switch)

DESCRIPTION
Tells the PCM when the brakes are applied. The switch is closed when the brakes are applied and open when they are released. The BOO switch will also disengage the 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.

DIAGNOSTIC TROUBLE CODES
P0703, P1703