Wiper And Washer. Wiper And Washer System Rain Sensor Circuit

Body Electrical. Lexus Gs430, Gs300. Uzs190 Grs190

Wiper And Washer. Lexus Gs430, Gs300. Uzs190 Grs190

WIPER AND WASHER SYSTEM - Rain Sensor Circuit

DESCRIPTION

This circuit provides power to operate the rain sensor.
The auto wiper system operates when the wiper switch is in the AUTO position.
The rain sensor is connected to each ECU through the multiplex communication line.
When the rain sensor detects raindrops in the detection area of the windshield glass, the sensor sends a wiper control signal according to the amount of raindrops to the cowl side junction block ECU LH.
The rain sensor also sends signals to the adaptive laser radar cruise control system and the mirror defogger system.

WIRING DIAGRAM

Lexus Gs430, Gs300. Uzs190 Grs190.Wiper And Washer.Wiper And Washer System.Wiper And Washer System Rain Sensor Circuit

INSPECTION PROCEDURE

HINT:

Before the procedure, check that the Multiplex Communication System (MPX) DTCs are not output (Click here).

1.CHECK RAIN SENSOR

Disconnect the Y4 rain sensor connector.

Measure the voltage of the connector.
Standard voltage:
Tester Connection
Condition
Specified Condition
Y4-1 (SIG) - Y4-3 (ES)
Engine switch on (IG)
10 to 14 V
Y4-1 (SIG) - Y4-3 (ES)
Engine switch off
Below 1 V

REPAIR OR REPLACE HARNESS AND CONNECTOR (RAIN SENSOR - OVERHEAD JUNCTION BLOCK)

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

Tester Connection	Condition	Specified Condition
Y4-1 (SIG) - Y4-3 (ES)	Engine switch on (IG)	10 to 14 V
Y4-1 (SIG) - Y4-3 (ES)	Engine switch off	Below 1 V