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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 Inoperative - One Horn >> 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. Ignition OFF, test for less than 1.0 ohm of resistance between the inoperative horn ground circuit terminal A and ground.
    • If greater than 1.0 ohm, test the ground circuit for an open/high resistance.
  2. Test for voltage at the inoperative horn connector B.
    • If voltage is present, replace the inoperative horn.
  3. Repair the open or high resistance in the horn control circuit.
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