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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1831 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Mirrors - Temperature Displays SC or OC >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  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 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 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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