LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Mirror Systems) >> Diagnostic Information and Procedures >> Automatic Day-Night Mirrors Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Inside Rearview Mirror Dimming Malfunction

  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Ignition OFF, test for less than 1 ohm of resistance 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 accessory circuit terminal 13 and ground.
    • If the test lamp does not illuminate, test the accessory circuit for a short to ground or an open/high resistance.
  4. If all circuits test normal, test or replace the inside rearview mirror.

Reverse Input Malfunction

  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Ignition ON, park brake applied, vehicle in REVERSE, test for B+ between the supply voltage terminal 9 and ground.
    • If less than the specified value, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Backup Lamps Malfunction .
  3. If all circuits test normal, test or replace the inside rearview mirror.
scientia non olet · About LEMON Manuals