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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Mirror System) >> Diagnostic Information and Procedures >> Automatic Day-Night Mirrors Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

Inside Review Mirror Dimming Malfunction

  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Test for less than 10 ohms between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 13 and ground.
    • If the test lamp does not illuminate test the ignition circuit for an open/high resistance or short to ground.
  4. Ignition ON, park brake applied, vehicle in REVERSE, verify that a test lamp illuminates between the backup lamp control circuit terminal 9 and ground.
    • If the test lamp does not illuminate test the control circuit for an open/high resistance or short to ground. If the circuit tests normal, refer to Backup Lamps Malfunction .
  5. If all circuits test normal, test or replace the inside rearview mirror.

Outside Review Mirror Dimming Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the driver outside rearview mirror.
  2. Test for less than 10 ohms between the low reference circuit terminal 6 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, test or replace the inside rearview mirror.
  3. Ignition ON, test for less than 1 volt between the signal circuit terminal 5 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the inside rearview mirror.
  4. Headlamps ON, vehicle in PARK, cover the front light sensor with a towel or other suitable item. Shine a flashlight at the rear light sensor. Test for greater than 1 volt between the signal circuit terminal 5 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the inside rearview mirror.
  5. If all circuits test normal, test or replace the driver outside rearview mirror glass.
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