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Home >> Ford >> 2003 >> Excursion 7.3 F, 4WD >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation - 7.3L Diesel >> Computerized Engine Controls >> Input Devices >> Brakelight Switch

Brakelight Switch

NOTE: Brakelight switch may also be referred to as Brake Pedal Position (BPP) switch.

The Brakelight switch is wired to brakelight circuit and PCM. Brakelight switch is located above brake pedal and signals PCM when brake pedal is applied. Brakelight switch input signal is used primarily for Torque Converter Clutch (TCC) lock/unlock strategy, cruise (speed) control and auxiliary idle control (if equipped). If all brakelights burn out, a pull-up resistor in PCM provides high voltage at PCM for fail-safe operation.

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