WIPER AND WASHER SYSTEM > Rain Sensor Circuit

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DESCRIPTION

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

WIRING DIAGRAM


E144480E09


INSPECTION PROCEDURE

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

  1. Disconnect the H75 windshield wiper relay assembly connector.

  1. Disconnect the T7 rain sensor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H75-8 (SIG) - T7-4 (SIG)
    		Always
    		Below 1 Ω
    T7-4 (SIG) - Body ground
    		Always
    		10 kΩ or higher
    H75-14 (PA1) - T7-3 (AUTO)
    		Always
    		Below 1 Ω
    T7-3 (AUTO) - Body ground
    		Always
    		10 kΩ or higher
    H75-25 (E) - T7-1 (ES)
    		Always
    		Below 1 Ω
    T7-1 (ES) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT WINDSHIELD WIPER RELAY ASSEMBLY


    E169150E09

  1. Reconnect the H75 windshield wiper relay assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H75-8 (SIG) - H75-25 (E)
    		Power switch on (IG)
    		7.5 to 8.5 V

    Text in Illustration 
    *a
    		Component with harness connected
    (Windshield Wiper Relay Assembly)



NG
REPLACE WINDSHIELD WIPER RELAY ASSEMBLY (Click here)
OK


3.INSPECT RAIN SENSOR


    E141656E22

  1. Reconnect the T7 rain sensor connector.

  1. Connect an oscilloscope to the rain sensor connector.

  1. Check for pulses.

    OK:
    Tester Connection
    		Condition
    		Specified Condition
    T7-3 (AUTO) - T7-1 (ES)
    		Power switch on (IG)
    		Pulse generation

    Text in Illustration 
    *a
    		Component with harness connected
    (Rain Sensor)



NG
REPLACE RAIN SENSOR (Click here)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)