Caution: Wrap the voltmeter probe with thin foil. Press the foil against the conductor with your finger and move it along the conductor to locate the break in the circuit.
1. Turn on the rear window defroster. Use a voltmeter to measure the voltage at the center of each defroster filament. If the voltage is approximately 6 V, the heating element is OK.
2. If the voltage is 12V, there is an open circuit between the center point and the positive terminal.
3. If the voltage is 0V, there is an open circuit between the center point and the negative terminal.
4. To locate the break, slowly move the probe toward the possible break. There will be a sharp change in voltage at the break point.
5. Use an ohmmeter to measure the resistance between the terminal and the center of the heating filament, and between the same terminal and the center of the adjacent filament. A heating element with a break will have a resistance twice as great as a good element.
1. Heating element without breakage;
2. Central point of the thread with a break;
3. Terminal (+). The voltmeter shows twice the voltage
This publication is based on information from the portal: HyundaiBook