Checking the heating element
Caution: Wrap thin foil around the tip of the voltmeter probe to prevent damage to the heating element conductor. Use your finger to press the foil against the conductor and move the foil along the conductor to determine the location of the open circuit.
1. Set the engine to 2000 rpm. Check the heating element with a fully charged battery.
2. Turn on the rear window defroster. Use a multimeter to measure the voltage in the middle of the rear window heating element (dot "A"). The heating element is in good condition if the voltage at the point "A" about 6 V.
3. If the voltage at the point "A" about 12 V, then there is an open circuit between the negative terminal of the heating element and the point "A". To determine the location of the break, slowly move the multimeter probe along the heating element from the point "A" to a negative conclusion. In the place where the circuit is broken, a sharp drop in voltage to 0 V will occur.
4. If at a point "A" voltage is 0 V, then an open circuit is located in the area from the point "A" to the positive terminal of the heating element. You can find the place of the break in the way described above. At the break point, there will be a sharp increase in voltage up to 12 V.
Removal and installation of the switch of a heater of back glass
Procedures for removing and installing the rear window defroster switch are given in chapter "Heating, air conditioning and ventilation system".
Check of the relay of a heater of back glass
1. Check for continuity between terminals "1" - "3" relay when no power is applied.
2. Supply power (battery voltage) to conclusions "1" (+) And "3" (-) and check for a closed circuit between the terminals "4" - "5" relay.