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Home >> Pontiac >> 2004 >> Aztek Base, AWD >> Repair and Diagnosis >> Brakes >> Antilock Brake System And Traction Control System >> Diagnostic Information and Procedures >> DTC C0161: Wheel Speed Sensor Frequency Error >> Circuit Description

Circuit Description

The Stoplamp Switch is a normally open switch, when the brake pedal is depressed the EBCM will sense battery voltage. This allows the EBCM to determine the state of the brake lamps. The EBCM sources 5 volts on the stop lamp switch signal circuit when the stop lamp switch is inactive. The voltage is supplied a ground path through the stop lamp bulbs.

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