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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1659 (Antilock Brake System - Hybrid 2.4L (Hp7)) >> Diagnostic Information and Procedures >> DTC C0035-C0050 or C1221-C1228 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

The wheel speed sensor receives B+ from the electronic brake control module (EBCM). As the wheel spins, the wheel speed sensor sends the EBCM a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.

When a wheel speed sensor fault is detected, the EBCM sends a serial data message to the engine control module (ECM), and the ECM sets a DTC and illuminates the MIL.

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