2.With the rear window defogger switch turned on, use a multimeter to measure the voltages of each printed heater at centre point A on the window glass. The printed heater is okay if 6 V is displayed.
3.If a voltage of 12 V is indicated at point A, the open circuit location is between point A and the (-) terminal to find the point where the voltage changes is the location of the open circuit.
4.In addition, if a voltage of 0 V is indicated at point A, the open circuit location is between point A and the (+) terminal. Use the same procedure as described above to find the point where the voltage changed to 12 V.