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Circuit/System Description

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

The instrument panel module (IPM) monitors the brake pedal position sensor. When the brake pedal is applied, the IPM detects a predetermined voltage signal. The IPM sends a serial data message to the engine control module (ECM) indicating the status of the stop lamps.

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