Window Grid
WARNING: This page is about a different car, the 1997 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
- Using a bright light inside vehicle, visually inspect wire grid from outside. A broken grid wire will appear as a Brown spot. Start and idle engine. Turn defogger on. Defogger indicator light should come on.
- Test for battery voltage at broad Red/Brown strips on rear window. A low voltage indicates a loose ground wire (pigtail) connection at ground screw. With negative voltmeter lead grounded, touch positive voltmeter lead to each grid line of heated rear window at its midpoint.
- A reading of approximately 5 volts indicates proper circuit function. If no voltage exists, circuit is broken between midpoint and hot side of grid line. A reading of 12 volts indicates circuit is broken between midpoint of grid line and ground.