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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Wiring Systems And Power Management - Service, Troubleshooting & Diagnosis >> Retained Accessory Power (RAP) Malfunction >> Accessory Circuit Test

Accessory Circuit Test

  1. Ignition OFF, remove the RUN/ACCY fuse in the underhood fuse block.
  2. Ignition ON, verify that a test lamp does not illuminate between the output terminal of the fuse and ground.
    • If the test lamp illuminates, test the accessory circuit for a short to voltage.
  3. Verify that a test lamp does not illuminate between the output terminal of the fuse and B+.
    • If the test lamp illuminates, disconnect the harness connector listed one at a time and verify the test lamp remains illuminated after each disconnect. If the test lamp turns off after a disconnect, replace the last component disconnected. If the test lamp remains illuminated after all components are disconnected, test the accessory circuit for a short to ground.
      • Automatic transmission shift lever
      • Midgate window switch - RPO SUT
      • Midgate control module - RPO SUT
      • Sunroof module - RPO CF5
  4. Test the accessory circuit for an open/high resistance.
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