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Home >> Pontiac >> 2009 >> G8 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Fixed And MOVEABLE Windows System) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Component Testing >> Rear Window Defogger Grid Test
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Rear Window Defogger Grid Test

WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, turn on the rear window defogger.
  2. Verify that a test lamp illuminates between each rear window defogger grid line and ground. The test lamp should be off when testing at the ground side of the grid and get brighter as the test lamp moves closer to the voltage supply side of the grid. The test lamp should be dim when testing each grid line in the middle.
    • If the test lamp remains bright at the middle of the grid line, test for an open between the test point and the ground side of the grid.
    • If the test lamp remains off at the middle of the grid line, test for an open between the test point and the voltage supply side of the grid.
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