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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Horn System) >> Diagnostic Information and Procedures >> Horns - Poor Tone >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the horn mounting hardware is tightened to the proper torque. Refer to Fastener Tightening Specifications .
    • If the mounting hardware is not tightened to the proper torque, retorque the fastener to spec.
  2. Ignition OFF, disconnect the harness connector at the horn assembly.
  3. Test for less than 1.0 ohm of resistance between the ground circuit terminal A and ground.
    • If greater than 1.0 ohm, test the ground circuit for a high resistance.
  4. If all circuits test normal, test or replace the horn assembly.
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