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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Horn System) >> Diagnostic Information and Procedures >> Horns Always On >> Circuit/System Testing

Circuit/System 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.
  1. Remove the HORN fuse from the underhood fuse block. The horns should turn OFF
    • If the horns remain on, repair the short to voltage in the horn control circuit.
  2. Ignition OFF, disconnect the BCM connector C5.
  3. Test for a ground signal at the horn relay control terminal of the BCM connector.
    • If a ground signal is not present, replace the underhood fuse block.
    4. IMPORTANT: The horn switch is located under the inflatable restraint steering wheel module. To disable the SIR system refer to SIR Disabling and Enabling .
  4. Ignition OFF, disconnect the horn switch and test the switch for shorted contacts.
    • If the switch does not function properly, replace.
  5. Test for a short to ground in the horn relay control circuit.
    • If the circuits/connectors test normal, replace the BCM.
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