Heated Glass Element: Testing and Inspection
HEATED BACK WINDOW GRID WIRE TEST1. Using a strong lamp inside the vehicle, visually 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 to the ON position. The indicator should come on.
3. Working inside the vehicle with a voltmeter such as Rotunda 73 Digital Multimeter 105-R0051 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 screw.
4. Contact a good ground point with the negative lead of the meter. The voltage reading should be the same.
5. With the negative lead of the meter grounded, touch each grid line of the heated back window at its midpoint with the positive lead. A reading of approximately six volts indicates that the line is good. A reading of zero volts indicates that the line is broken between the midpoint and the B+ side of the grid line. A reading of 12 volts indicates that the circuit is broken between the midpoint of the grid line and ground.
ADDITIONAL TESTING PROCEDURES
Additional Heated Rear Window diagnostic information is included within Power Window diagnostic information found at Windows and Glass/Testing and Inspection.