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2004 Chevrolet Impala - Headlight Problems

Headlight problems I have replaced the relay the head light switch and the fuse still no lights what’s going on could it be my multifunction switch

The headlight switch is separate from the multi-function switch,

The Body Control Module controls the headlight relay.

Remove the relay and insert a test light on the primary side of the relay socket and turn the headlight switch on.

If the test light doesn’t light, the BCM is the problem.

Tester

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