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 | See page |
|---|---|---|
| The combustion heater assembly does not operate. | Power heater alternator circuit | |
| Power heater fuel pump circuit | ||
| Power heater switch circuit | ||
| ECU power source circuit | ||
| PWR HTR Fuse, A/C Fuse | - | |
| Combustion heater assembly | - | |
| Heater fuel pump sub-assembly | - | |
| Generator assembly (for 1ND-TV) | - | |
| Heater switch assembly | - | |
| Wire harness or connector | - |