DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK MAIN BODY ECU LH (COWL SIDE J/B LH)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH (COWL SIDE J/B LH) - BODY GROUND)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH (COWL SIDE J/B LH) - BATTERY)
WIPER AND WASHER SYSTEM - Wiper Motor Power Source Circuit
DESCRIPTION
This circuit provides power to the front wiper motor and operates the main body ECU LH (cowl side J/B LH).
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK MAIN BODY ECU LH (COWL SIDE J/B LH) |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| LD-13 (IG) - LD-8 (SGND) | Engine switch off | Below 1 V |
| Engine switch on (IG) | 10 to 14 V |
| LD-13 (IG) - LD-9 (SGND) | Engine switch off | Below 1 V |
| Engine switch on (IG) | 10 to 14 V |
| LM-1 (WIG) - LD-3 (GND) | Always | 10 to 14 V |
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 2.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH (COWL SIDE J/B LH) - BODY GROUND) |
Disconnect the LD and main body ECU LH (cowl side J/B LH) connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| LD-3 (GND) - Body ground | Always | Below 1 Ω |
| LD-9 (SGND) - Body ground | Always | Below 1 Ω |
| LD-8 (SGND) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH (COWL SIDE J/B LH) - BATTERY) |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| LD-13 (IG) - Body ground | Engine switch off | Below 1 V |
| Engine switch on (IG) | 10 to 14 V |
| LM-1 (WIG) - 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
