Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Heater. Lexus Is250, Is220D. Gse20 Ale20
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 | Click here |
| 2. Power heater switch circuit | Click here | |
| 3. Power heater fuel pump circuit | Click here | |
| 4. Power heater alternator circuit | Click here | |
| 5. Combustion heater assembly | Click here |