Heated Back Window Grid Wire Test
Heated Back Window Grid Wire Test1. Using a strong lamp inside the vehicle, inspect the wire grid from the outside. A broken grid wire will appear as a brown spot.
2. Run the engine at idle. Set the heated back window switch and light to ON. The indicator should come on.
3. Working inside the vehicle with a 12-volt dc voltmeter such as Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, contact the broad red-brown strips on the rear window positive lead to battery side and negative lead to ground side. The meter should read 10-13 volts. A lower voltage reading indicates a loose heated back window ground wire (pigtail) connection at the heated back window ground wire attaching screw.