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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 439 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2600 (With X88, Z75, and Z88) >> Circuit/System Testing

Circuit/System Testing

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WARNING:

The high intensity discharge system produces high voltage and current. To reduce the risk of severe shocks and burns:

  • Never open the high intensity discharge system ballast or the arc tube assembly starter.
  • Never probe between the high intensity discharge system ballast output connector and the arc tube assembly.
  1. Ignition OFF, disconnect the X4 harness connector at the BCM.
  2. Ignition ON, verify a test lamp illuminates between the relay control circuit terminal 23 and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.
  3. Ignition OFF, reconnect the X4 harness connector at the BCM.
  4. Disconnect the X4 harness connector at the underhood fuse block.
  5. Ignition ON, verify a test lamp does not illuminate between the relay control circuit terminal H4 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  6. Ignition OFF, reconnect the X4 harness connector at the underhood fuse block.
  7. Disconnect the harness connector at the appropriate daytime running lamp.
  8. Test for less then 5 Ω between the ground circuit listed below and ground.
    • Terminal B (Z75)
    • Terminal C (X88/Z88)
      • If less than the specified range, test the ground circuit for an open/high resistance.
  9. Ignition OFF, connect a test lamp between the control circuit terminal A and ground.
  10. Ignition ON, command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.
  11. If all circuits test normal, replace the appropriate daytime running lamp.
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