Component Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Rear Window Defogger Grid Test
- Ignition ON, turn on the rear window defogger.
- Verify that a test lamp illuminates between each rear window defogger grid line and ground.
- 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.