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Home >> Chevrolet >> 2007 >> HHR LS, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> Mirror Compass Display Inoperative or Inaccurate >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, observe the compass display for either having an incorrect reading, a letter "C" or "CAL" or the compass display that is totally blank.
    • If the compass display reads an incorrect reading or a letter "C" or "CAL" perform the compass reprogramming procedure.
  2. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  3. Test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for a short to voltage or an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the accessory voltage supply circuit and ground.
    • If the test lamp does not illuminate, repair the voltage supply circuit for a short to ground or an open/high resistance.
  5. If the compass display is totally blank, replace the rearview mirror.
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