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Home >> Cadillac >> 2013 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Hybrid/EV Energy Storage System) >> Diagnostic Information and Procedures >> Drive Motor Battery Noise >> Circuit/System Testing

Circuit/System Testing

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  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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