Heated Glass Element: Testing and Inspection
Heated Back Window Grid Wire Test1. Using a strong light inside vehicle, visually inspect wire grid from outside. A broken grid wire will appear as a brown spot.
2. Run engine at idle. Set heated back window switch and light to ON. The indicator lamp should come on.
3. Working inside vehicle with a 12 volt DC voltmeter such as Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, contact broad red / brown stripes on sides of rear window. The meter should read 10-13 volts. A lower voltage reading indicates a loose ground wire (pigtail) connection at grounded side of glass.
4. Contact a good ground point with negative lead of meter. The voltage reading should not change.
5. With negative lead of meter grounded, touch each grid line of heated rear window at its midpoint with positive lead. A reading of approximately 6 volts indicates that line is good. A reading of zero volts indicates that line is broken between midpoint and positive side of grid line. A reading of 12 volts indicates that circuit is broken between midpoint of grid line and ground.