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Home >> Chevrolet >> 2005 >> Classic >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Lighting Systems) >> Diagnostic Information and Procedures >> DTC B2575 >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Pontiac Grand Am and 2004 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) turns on the automatic lighting control (ALC) relay when the ambient light sensor senses a dark condition. Battery positive voltage is supplied to the ALC relay at all times through the LH HDLP fuse. The BCM grounds the ALC relay control circuit in order to activate the relay.

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