SW2 L4-1.9L DOHC VIN 7 (1997)
Heated Glass Element: Component Tests and General Diagnostics
Testing Grid Lines
To locate inoperative grid lines, turn ignition key to the On position and the rear defog switch On. Attach the black lead of the multi meter (set to the 20
volt scale) to ground. Lightly touch the red lead of the multimeter to each grid line.
Testing Grid Lines
The multimeter should display battery voltage at the positive side (driver side - SC/SL, passenger side - SW) of each grid line. The voltmeter should
gradually display less voltage as the red lead of the multimeter is moved toward the passenger side (SC/SL) or driver side (SW) of the vehicle.
If the reading shows battery voltage as the red lead is moved across the grid lines and then makes a sudden jump down to zero volts (ground) that grid
line has an open in it.
Items required for grid repair:
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GM PN 12345345 (or equivalent) Rear Window Defogger Repair Kit
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Heat gun - capable of 260°C (500°F)
