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Keep it simple, check the horn fuse, if good remove horn relay & briefly connect the #86 & #30 (12V+ to horn), If horns blow then swap relay with Daytime running lights. Note the relay position when you remove them cause GM reverses some of the relays.

If horn still doesn't work then its probably the horn switch on the air bag cover. $400+ repair.

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15y ago

What else can I help you with?