Circuit Description
WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 Chevrolet Suburban, and 2002 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The stoplamp switch indicates the brake pedal status. The normally-closed stoplamp switch supplies a battery voltage signal to the PCM. The signal voltage circuit opens when the brakes are applied.
If the PCM detects a closed stoplamp switch during decelerations, then DTC P0724 sets. DTC P0724 is a type "C" DTC.