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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISBODY & FRAMEWINDOWSFIXED & MOVEABLE WINDOW SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCOMPONENT TESTINGREAR WINDOW DEFOGGER GRID TEST
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Rear Window Defogger Grid Test

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Rear Window Defogger Grid Test
  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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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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