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3 1. Install a scan tool. 2. Turn ON the ignition, with the engine OFF. 3. With a scan tool, command the horn relay ON and OFF. Do the horns turn ON and OFF with each Go to Step 11 Go to Step 4 4 1. Disconnect the horn relay. 2. Connect a test lamp between the battery positive voltage circuit of the Does the test lamp illuminate? Go to Step 5 Go to Step 15 5 1. Connect a test lamp between the battery positive voltage circuit of the 2. Depress and hold the horn switch. Does the test lamp illuminate? Go to Step 6 Go to Step 12 6 Connect a test lamp between the battery Go to Step 7 Go to Step 16 7 Momentarily connect a 15-amp fused Go to Step 10 Go to Step 8 8 1. Reconnect the horn relay. 2. Disconnect the horn connector. 3. Connect a test lamp between the horn fuse supply voltage circuit and a good 4. Depress and hold the horn switch.
2007 Hummer H3 2007 ACCESSORIES & EQUIPMENT Horns - H3
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