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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 749 (Horn System) >> Diagnostic Information and Procedures >> Horns Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, connect a test lamp between the HORN fuse test point and ground.
  2. Press and release the horn switch. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not illuminate or remains illuminated at all times, refer to Horn Switch Circuit Test in Circuit/System Testing .
  3. Ignition ON, command the horn ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not illuminate, replace the BCM.
  4. Connect a 10A fused jumper wire between B+ and the HORN fused test point. The horn should sound and emit a clear and even tone.
    • If the horn does not sound, refer to Horn Circuit Test in Circuit/System Testing .
    • If the sound emitted is not clear and even, refer to Horn - Poor Tone.
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