Rain Sensor Circuit

WIPER / WASHER: WIPER AND WASHER SYSTEM (w/ Rain Sensor): Rain Sensor Circuit
- Rain Sensor Circuit

DESCRIPTION

The windshield wiper relay assembly receives a signal from the rain sensor to control the auto wiper system.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY - RAIN SENSOR)

(a) Disconnect the D78 windshield wiper relay assembly connector.

(b) Disconnect the T3 rain sensor connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

2. INSPECT WINDSHIELD WIPER RELAY ASSEMBLY

(a) Reconnect the windshield wiper relay assembly connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPLACE WINDSHIELD WIPER RELAY ASSEMBLY Removal
OK -- Continue to next step.

3. INSPECT RAIN SENSOR

(a) Reconnect the rain sensor connector.





(b) Connect an oscilloscope to the rain sensor connector.

(c) Check for pulses.

OK:





Text in Illustration





NG -- REPLACE RAIN SENSOR Removal

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Wiper and Washer System (w/ Rain Sensor)