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having a lighting problem with my 2002 sierra denali....the cab lights and the fog light dont work....the bulbs and the fuses appear to be ok....does any of that run through any modules?...or do you know where i can get a wiring diagram
 

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KEVIN CAPS LOCK
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MAYBE A RELAY?
 

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Sounds like 2 problems. Fog lights go through the BCM that grounds the relay.When you hit the fog light switch it is just a momentary contact switch that sends a signal to the BCM to request fog lights. When you say cab lights,do you mean the clearance lights on the roof? They get power from the headlight switch.
 
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