Heated Glass Element: Testing and Inspection
Heated Rear Window Grid Wire Test1. Using a bright lamp inside the vehicle, visually inspect the grid wire from the outside. A broken grid conductor line will appear as a brown spot.
2. Run the engine at idle. Set the heated rear window control switch and lights to ON. The heated rear window indicator light should illuminate.
3. Working inside the vehicle with a multimeter, contact the broad red/brown strips on the heated 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 rear window ground wire connection at the heated rear window ground wire screw.
4. Contact a ground point with the negative lead of the multimeter. The voltage reading should not change.
5. With the negative lead of the multimeter grounded, touch each grid line of the heated rear window at its midpoint with the positive lead. A reading of approximately six volts indicates that the line is OK. A reading of zero volts indicates that the line is broken between the midpoint and the battery 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.
6. Repair the heated rear window grid. REFER to Grid Wire Repair.
For further information regarding the diagnosis of this component and the
system that it is a part of, please refer to Windows and Glass; Testing and Inspection.