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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Mirrors - Temperature Display Inaccurate >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the ambient air temperature sensor. Install a signal generator and instrument panel tester between the signal circuit and the low reference circuit.
  2. Ignition ON, vary the resistance on the signal generator from 2.5K to 230K. Verify that the temperature displayed on the ISRVM matches the ambient temperature resistance chart.
    • If the temperature displayed is incorrect, test the signal circuit and the low reference circuit for an open/high resistance. If the circuits test normal, replace the ISRVM.
  3. If the temperature displayed is correct, replace the ambient air temperature sensor.
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