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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (Cruise Control System) >> Diagnostic Information and Procedures >> DTC P0703 - Brake Switch Circuit 2 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) monitors the brake pedal position (BPP) sensor. When the brake pedal is applied, the BCM detects a predetermined voltage signal. The BCM sends a class 2 serial data message to the powertrain control module (PCM) indicating the status of the stop lamps.

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