GMC? Envoy not Envoy XL. guess not XL
steering center horn or aux, alarm horn?
all fuses good.
it has a relay too, and must click if horn is dead. heard. to click.
well it is no there is is here.
left front panel (usa car only)
if 2 there that be rare both fail unless rusted there grounds.
if both dead realy
if rely good , BCM is failing or fuses blown
scan the car, first, it may tell you BCM errors or ??????
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