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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 497 (Hybrid/EV Energy Storage System) >> Diagnostic Information and Procedures >> Drive Motor Battery Noise >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, inspect the hybrid drive motor battery air inlet and outlet for debris, or for a restriction.
    • If debris or a restriction is found, repair as necessary.
  2. Check for loose and vibrating duct work.
    • If loose or vibrating duct work is found, repair as necessary.
  3. Ignition ON, command the hybrid drive motor battery fan ON and OFF with a scan tool. The fan should not make objectionable noise.
    • If the fan makes excessive noise, replace the hybrid drive motor battery fan.
  4. Command the HV contactors ON and OFF with a scan tool one at a time. The HV contactors should not make objectionable noise, compare to like vehicle.
    • If the HV contactors make objectionable noise check the contactor mounting insulators and torque of mounting fasteners. Tighten and repair as necessary.
    • If the HV contactor has objectionable noise, replace the HV contactor.
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