Horn issue

[Philv]

I've tried to figure this thing out. Horn does work intermently. When engine is running in park it'll sometimes work, but I have yet to get it to work while in gear and or driving. Does anyone have a wiring diagram of the horn so I could possibly trace the system?

 

[TheBac]

AlldataDIY is your friend. Buy a subscription for your truck. Its worth the small amount of $$. Wiring diagrams and pin-outs galore.

You could also look on GMUpfitter. That site may have something, too.

 

[OregonDMAX]

Have you pulled the airbag off to check the contactor or wiring

 

[Dozerboy]

^^ start there

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