Question about 2002 Chevrolet Cavalier Coupe

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Headlight left on warning not working, what should I look at?

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Headlight on warning works through the radio and the Body Control Module (BCM). The BCM has an input from the lighting circuit and when it decides that the warning should turn on, it sends a class 2 serial data communications to the radio. The radio then sends a cime tone to the driver's front door speaker.

If by chance, you replaced the OEM radio with and aftermarket radio and did not install an interface module, you will be missing not only the headlight warning but many other warnings as well ( low oil / hot engine, etc.)

Posted on Jan 04, 2010

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