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Home >> Chevrolet >> 2004 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 432 (Mirror System) >> Diagnostic Information and Procedures >> Mirrors - Automatic Day-Night Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the rearview mirror.
  2. Test for less than 3 ohm of resistance between the ground circuit and ground.
    • If greater than 3 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the 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.
  4. With the transmission in PARK, test for 0.5 volt between the backup lamp supply voltage circuit and ground.
    • If the voltage is greater than 0.6 volt, test the backup lamp supply voltage circuit for a short to voltage.
  5. With the transmission in REVERSE, test for battery voltage between the backup lamp supply voltage circuit and ground.
    • If the voltage is not 12 volts, test the backup lamp supply voltage circuit for an open/high resistance.
  6. If all circuits test normal, replace the rearview mirror.
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