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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1059 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B3857: Headlamp High Beam Signal Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) monitors the high beam headlamp signal circuit by verifying the high beam input.

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