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.
As the operation of the power steering system may be limited due to battery voltage reduction history, proceed according to "How to Proceed with Troubleshooting".
| Symptom | Suspected Area | See page |
|---|---|---|
| Rear window defogger system does not operate | DEF fuse | |
| LIN communication system | - | |
| Main body ECU (Instrument panel junction block assembly [DEF relay]) | - | |
| Air conditioning control | - | |
| Air conditioning amplifier | - | |
| Harness or connector | - | |
| Rear window defogger, Quick heater and Mirror heater do not operate | Power steering system (battery voltage reduction history) |