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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting >> Diagnostic Information and Procedures >> DTC B2652 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the affected component.
  2. Ignition OFF, verify that a test lamp illuminates between the listed ground circuit terminal and battery voltage.
    • Headlamp Switch terminal 8
    • Sunroof switch terminal C
    • Midgate window switch terminal D
    • 4wd mode switch terminal 6
    • PRNDL terminal B
    • Global window switch terminal D
    • Rear window switch terminal E
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the listed backlighting control circuit terminal and ground.
    • Headlamp Switch terminal 7
    • Sunroof switch terminal A
    • Midgate window switch terminal E
    • 4wd mode switch terminal 5
    • PRNDL terminal A
    • Global window switch terminal E
    • Rear window switch terminal A
  4. Command the dimming test high to low with a scan tool. The test lamp should turn from bright to dim when changing between the commanded states.
    • If the test lamp is always off, test the control circuit for an open/high resistance or short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always bright, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the affected component.
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