Rain Sensor Circuit

WIPER AND WASHER: WIPER AND WASHER SYSTEM: Rain Sensor Circuit

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 at the multiplex communication circuit.
When it detects raindrops that are stuck to the detection area on the windshield glass, it sends the wiper control signal according to the amount of raindrops to the Windshield Wiper ECU.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT RAIN SENSOR (SIG, ES)




(a) Disconnect the connector from the rain sensor.
(b) Check that there is continuity between terminal ES on the wire harness side and body ground.
Standard:
Continuity
(c) Turn the ignition switch to ON.
(d) Measure the voltage between terminals SIG and ES on the wire harness side.
Standard voltage:
10 to 14 V
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER ECU - RAIN SENSOR)
(a) Check for open and short circuit in the harness and the connector between terminal MPX1 of the windshield wiper ECU and the terminal MPX of the rain sensor.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE