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

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at an affected courtesy/reading lamp center.
  2. Test for less than 1 ohm of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the listed inadvertent power supply circuit terminal and ground.
    • Front terminal A
    • 2nd and 3rd row terminal C
    • If the test lamp does not illuminate, test the inadvertent power supply circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the BCM.
  4. Connect the harness connector at the courtesy/reading lamp center, and remove the reading lamp bulb.
  5. Connect a test lamp across the bulb terminals.
  6. Ignition ON, turn the reading lamp switch on and off. The test lamp should turn on and off when changing between the commanded states.
    • If the test lamp is always on, replace the affected courtesy/reading lamp center.
    • If the test lamp is always off, replace the affected courtesy/reading lamp center.
  7. If all circuits test normal, test or replace the affected reading lamp bulb.
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