Heated Glass Element: Testing and Inspection

Rear Window Defogger Function Test

Upper Rear Window Defogger

NOTE:

- Before testing, troubleshoot the B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.
- Before testing, check the No. 8 (40 A) fuse in the under-hood fuse/relay box and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.
- Be careful not to scratch or damage the defogger wires with the tester probe.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then turn the rear window defogger switch ON.

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

- If there is no voltage, check for:
- A faulty rear window defogger relay Testing and Inspection.
- A faulty climate control unit.
- A faulty audio-navigation and HVAC switch panel (with navigation).
- A faulty audio and HVAC switch panel (without navigation).
- An open or high resistance in the GRN wire to the positive terminal.
- If there is battery voltage, go to step 3.





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

- If there is less than 0.2 V, go to step 4.
- If there is more than 0.2 V, check for:
- An open or high resistance in the ground wire.
- Poor ground (G603).

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.

Lower Rear Window Defogger

NOTE:

- Before testing, troubleshoot the B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.
- Before testing, check the No. 8 (40 A) fuse in the under-hood fuse/relay box and the No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box.
- Be careful not to scratch or damage the defogger wires with the tester probe.

1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode, then turn the rear window defogger switch ON.

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

- If there is no voltage, check for:
- A faulty rear window defogger relay Testing and Inspection.
- A faulty climate control unit.
- A faulty audio-navigation and HVAC switch panel (with navigation).
- A faulty audio and HVAC switch panel (without navigation).
- An open or high resistance in the GRN wire to the positive terminal.
- If there is battery voltage, go to step 3.





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

- If there is less than 0.2 V, go to step 4.
- If there is more than 0.2 V, check for:
- An open or high resistance in the ground wire.
- Poor ground (G603).

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.