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.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Heater assembly does not operate | Proceed to ECU Power Source Circuit | |
| Proceed to Power Heater Switch Circuit | ||
| Proceed to Power Heater Fuel Pump Circuit | ||
| Proceed to Power Heater Alternator Circuit | ||
| Replace heater assembly |