Heated Glass Element: Testing and Inspection
Rear Window Defogger Function TestBefore troubleshooting the rear window defogger circuit, perform multiplex integrated control system troubleshooting using B-CAN System Diagnosis Test Mode A.
NOTE:
- Be careful not to scratch or damage the defogger wires with the tester probe.
- Before testing, check the No. 14 (40 A) fuse in the under-hood fuse/relay box and No. 7 (7.5 A) and No. 30 (7.5 A) fuses in the under-dash fuse/relay box.
1. Check for voltage between the positive terminal (A) and body ground with the ignition switch and defogger switch ON.
There should be battery voltage.
- If there is no voltage, check for:
- Faulty rear window defogger relay.
- Faulty AM/FM antenna amplifier-rear window defogger coil.
- Faulty passenger's climate control switch assembly.
- Faulty display panel control unit.
- An open in the BLK/YEL wire to the positive terminal.
- If there is voltage, go to step 2.
2. Disconnect the negative terminal (B) from the rear window defogger.
3. Check for continuity between the negative terminal and body ground.
If there is no continuity, check for an open in the wire or poor ground (G801). If there is continuity, go to step 4.
4. Reconnect the negative terminal to the rear window defogger.
5. Turn the ignition switch ON (II) and the rear window defogger switch ON.
6. Touch the voltmeter positive probe to the each points on 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 it is more than specified at one of the points, there is a break in the negative half of the wire.
- If it is less than specified at one of the points, there is a break in the positive half of the wire.