Lexus IS250 IS220d GSE20 ALE20 - HEATER
COMBUSTION TYPE POWER HEATER SYSTEM - PROBLEM SYMPTOMS TABLE
If the normal system code is displayed during a DTC check even through the problem still occurs, check the circuits for each problem symptom in the order given in the table below, and proceed to the relevant troubleshooting.
| Symptom | Suspected area | See page |
| The combustion type power heater does not operate. | 1. ECU power source circuit | |
| 2. Power heater switch circuit | ||
| 3. Power heater fuel pump circuit | ||
| 4. Power heater alternator circuit | ||
| 5. Combustion heater assembly |