Heated Glass Element: Testing and Inspection

Rear Window Defogger Function Test

NOTE:

- Be careful not to scratch or damage the defogger wires with the tester probe.
- Before testing, make sure the No. 8 (30 A) [No. 8 (40 A)] fuse in the under-hood fuse/relay box and the No. 36 (10 A) fuse in the under-dash fuse/relay box are OK.
[ ]: 2-door

1. Turn the ignition switch to ON (II), then turn the rear window defogger switch ON.

2. Measure the voltage between rear window defogger A (1P) positive terminal and body ground. There should be battery voltage.

- If there is no voltage, check for:
- Faulty rear window defogger relay.
- Faulty HVAC control unit/heater control panel.
- An open or high resistance in the RED wire to the positive terminal.
- If there is voltage, go to step 3.





3. Measure the voltage between rear window defogger B (1P) negative terminal and body ground. There should be less than 0.2 V.

- If there is more than 0.2 V, check for:
- An open or high resistance in the ground wire.
- Poor ground (G801)
- If there is less 0.2 V, go to step 4.

4. Touch the voltmeter positive probe along each defogger wire, and the negative probe to the negative terminal.

- If the voltage is as specified, the defogger wire up to that point is OK.
- If the voltage is not as specified, repair the defogger wire.
- If voltage is more than specified at one of the points, there is a break in the negative half of the wire.
- If voltage is less than specified at one of the points, there is a break in the positive half of the wire.