Component Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Install a 15-amp fused jumper wire between the control terminal B and 12 volts. Momentarily install a jumper wire between the ground terminal A and ground. The horn should emit a clear and even tone.

If the horn does not emit and clear and even tone, replace the horn assembly.