DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT FUSE (PWR HTR)
CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - BODY GROUND)
CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - BATTERY)
COMBUSTION TYPE POWER HEATER SYSTEM - ECU Power Source Circuit
DESCRIPTION
This is power source for the power heater ECU (combustion heater assembly).
WIRING DIAGRAM
INSPECTION PROCEDURE
Remove the PWR HTR fuse from the engine room R/B and J/B No. 1.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Inspection item | Condition | Specified condition |
| PWR HTR fuse | Always | Below 1 Ω |
| 2.CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - BODY GROUND) |
Remove the power heater ECU (combustion heater assembly).
Disconnect the connector from the power heater ECU (combustion heater assembly).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester connection
(Symbols) | Condition | Specified condition |
| A51-1 (E) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - BATTERY) |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester connection
(Symbols) | Condition | Specified condition |
| A51-5 (B) - Body ground | Always | 10 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
LEXUS IS250, IS220d / GSE20 ALE20
