Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
| Symptom | Suspected Area | Link |
|---|---|---|
| Rear window defogger system does not operate*1 | Air conditioning system | |
| Defogger relay | - | |
| Air conditioning amplifier assembly | - | |
| Air conditioning control assembly | - | |
| Back door glass (rear window defogger wire)*3 | - | |
| Back door glass (rear window defogger wire)*4 | - | |
| Back window glass (rear window defogger wire)*5 | - | |
| Wire harness or connector | - | |
| Rear window defogger system does not operate (indicator on)*2 | DEF fuse | |
| Defogger relay | ||
| Back door glass (rear window defogger wire)*3 | ||
| Back door glass (rear window defogger wire)*4 | ||
| Back window glass (rear window defogger wire)*5 | ||
| Wire harness or connector | - | |
| Rear window defogger system does not operate (indicator offF)*2 | HTR-IG fuse | |
| Defogger relay | ||
| No. 2 heater control sub-assembly | ||
| Wire harness or connector | - |
*1: for Automatic Air Conditioning System
*2: for Manual Air Conditioning System
*3: for Hatchback
*4: for Wagon
*5: for Sedan