DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK MAIN BODY ECU LH (COWL SIDE J/B LH)
INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU)
CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - BODY GROUND)
CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - MAIN BODY ECU LH (COWL SIDE J/B))
WIPER AND WASHER SYSTEM - Wiper Switch (HI Speed) Circuit
DESCRIPTION
The main body ECU LH (cowl side J/B LH) receives a HI position signal from the windshield wiper switch assembly to operate the wiper motor at HI speed.
Even if the ECU malfunctions, this circuit structure enables it to operate the wiper in HI operation mode.
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 |
| Q2-11 (2S) - Body ground | Wiper switch not in HI position | 10 to 14 V |
| Q2-11 (2S) - Body ground | Wiper switch in HI position | Below 1 V |
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 2.INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY (COMBINATION SWITCH ECU) |
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| 3 (2S) - 5 (E) | Wiper switch in HI position | Below 1 Ω |
| 3 (2S) - 5 (E) | Wiper switch not in HI position | 10 kΩ or higher |
| | REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY |
|
|
| 3.CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - BODY GROUND) |
Disconnect the J26 windshield wiper switch assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J26-5 (E) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH - MAIN BODY ECU LH (COWL SIDE J/B)) |
Disconnect the Q2 main body ECU LH (cowl side J/B LH) connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J26-3 (2S) - Q2-11 (2S) | Always | Below 1 Ω |
| Q2-11 (2S) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
LEXUS IS250, IS220d / GSE20 ALE20
