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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Electrical >> Gauges >> Displays And Gages >> Diagnostic Information and Procedures >> Mirrors - Temperature Displays SC or OC >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the ambient air temperature sensor.
  2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal B and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that OC is displayed on the ISRVM display.
    • If OC is not displayed, test the signal circuit for a short to ground.
  4. Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal A and ground. Verify that SC is displayed on the ISRVM display.
    • If SC is not displayed, test the signal circuit for an open/high resistance. If the circuit tests normal replace the ISRVM.
  5. If the display is correct, replace the ambient air temperature sensor.
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