DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK MAIN BODY ECU RH (COWL SIDE J/B RH) (HDLO SIGNAL)
INSPECT FRONT CONTROLLER (ENGINE ROOM NO. 2 J/B) (FRWA SIGNAL)
CHECK HEADLIGHT CLEANER SWITCH ASSEMBLY
CHECK MAIN BODY ECU RH (COWL SIDE J/B RH) (HRLY SIGNAL)
CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - MAIN BODY ECU RH)
CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - FRONT CONTROLLER)
CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER SWITCH ASSEMBLY - MAIN BODY ECU RH)
WIPER AND WASHER SYSTEM - Headlight Cleaner Switch Circuit
DESCRIPTION
This circuit detects the conditions (on or off) of the headlight cleaner switch.
The headlight cleaner control relay receives the following signals:
Headlight cleaner switch signal
Headlight operating signal
Daytime running light operating signal
Front washer motor operating signal
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK MAIN BODY ECU RH (COWL SIDE J/B RH) (HDLO SIGNAL) |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| A36-4 (HDLO) - Body ground | Engine switch on (IG) and light control switch OFF | 10 to 14 V |
| A36-4 (HDLO) - Body ground | Engine switch on (IG) and light control switch in HEAD position | Below 1 V |
| 2.INSPECT FRONT CONTROLLER (ENGINE ROOM NO. 2 J/B) (FRWA SIGNAL) |
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
| Tester Connection | Condition | Specified Condition |
| 2F-8 (FRWA) - Body ground | Engine switch on (IG) and front washer is stopped | 10 to 14 V |
| 2F-8 (FRWA) - Body ground | Engine switch on (IG) and front washer is operated | Below 1 V |
| 3.CHECK HEADLIGHT CLEANER SWITCH ASSEMBLY |
Disconnect the connector from the headlight cleaner switch assembly.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| 4 - 3 | Headlight cleaner switch not pushed | 10 kΩ or higher |
| 4 - 3 | Headlight cleaner switch pushed | Below 1 Ω |
| OK | |
| |
| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE |
|
| 5.CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - MAIN BODY ECU RH) |
Disconnect the A3 headlight cleaner control relay connector.
Disconnect the A36 main body ECU RH (cowl side J/B RH) connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connector | Condition | Specified Condition |
| A3-1 (HDLO) - A36-1 (HDLO) | Always | Below 1 Ω |
| A3-1 (HDLO) - Body ground | Always | 10 k Ω or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - MAIN BODY ECU RH) |
|
|
| OK | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU RH (COWL SIDE J/B RH) - BATTERY) |
|
| 6.CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - FRONT CONTROLLER) |
Disconnect the 2F front controller (engine room No. 2 J/B) connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| A3-5 (FRWA) - 2F-8 (FRWA) | Always | Below 1 Ω |
| A3-5 (FRWA) - Body ground | Always | 10 k Ω or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - FRONT CONTROLLER) |
|
|
| OK | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT CONTROLLER (OVERHEAD J/B) - BATTERY) |
|
| 7.CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER SWITCH ASSEMBLY - MAIN BODY ECU RH) |
Disconnect the J13 headlight cleaner switch assembly connector.
Disconnect the RL main body ECU RH (cowl side J/B RH) connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
| Tester Connection | Condition | Specified Condition |
| J13-4 (L) - RL-7 (HRLY) | Always | Below 1 Ω |
| RL-7 (HRLY) - Body ground | Always | 10 k Ω or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT CLEANER SWITCH ASSEMBLY - MAIN BODY ECU RH) |
|
|
| OK | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU RH (COWL SIDE J/B RH) - BATTERY) |
|
LEXUS IS250, IS220d / GSE20 ALE20
