Horns - Poor Tone

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Horns - Poor Tone Diagnostic Table

Step	Action	Yes	No
1	Did you perform the Horns Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Horns
2	Depress the horn switch. Do the horns have a harsh tone or buzzing?	Go to Step 3	Go to Symptoms - Horns
3	Test the horn mounting hardware for adequate torque. The hardware should be tightened to 10 N.m (7 lb ft). Inspect the horns for debris in the joint where the horns attach to the vehicle. Did you find and correct the condition?	Go to Step 7	Go to Step 4
4	Disconnect the horn connector. Connect a 15 amp fuse jumper wire between the positive battery terminal and the control terminal of the horn. Connect another jumper wire between the negative battery terminal and the ground terminal of the horn. Do the horns have a harsh tone or buzzing?	Go to Step 6	Go to Step 5
5	Repair the high resistance in the horn control circuit or the horn ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 7	-
6	Replace the horns. Refer to Horn Replacement in Horn. Did you complete the replacement?	Go to Step 7	-
7	Operate the horns. Do the horns operate properly?	System OK	Go to Step 1