WIPER AND WASHER SYSTEM Rain Sensor Circuit

DESCRIPTION

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

CAUTION / NOTICE / HINT

PROCEDURE

1. Click here

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

   
   

   1. Disconnect the H51 windshield wiper relay assembly connector.

   2. Disconnect the T1 rain sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H51-14 (MPX1) - T1-1 (MPX1) Always Below 1 Ω T1-1 (MPX1) - Body ground Always 10 kΩ or higher

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

2. Click here

   CHECK HARNESS AND CONNECTOR (ROOF CONSOLE BOX ASSEMBLY - IG CIRCUIT AND BODY GROUND)

   
   

   1. Disconnect the T10 roof console box assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition T10-1 (IG) - T10-21 (GND2) Power switch on (IG) 11 to 14 V

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

3. Click here

   CHECK HARNESS AND CONNECTOR (RAIN SENSOR - AUXILIARY BATTERY AND BODY GROUND)

   
   

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

      Standard Resistance
      Tester Connection Condition Specified Condition T1-2 (ES) - T10-21 (GND2) Always Below 1 Ω T1-4 (SIG) - T10-14 (IG2) Always Below 1 Ω

   
   
   • OKClick here
   • NG

     REPAIR OR REPLACE HARNESS OR CONNECTOR

4. Click here

   INSPECT ROOF CONSOLE BOX ASSEMBLY

   
   

   1. Reconnect the T10 roof console box assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition T1-4 (SIG) - T1-2 (ES) Power switch on (IG) 11 to 14 V

   
   
   • OKClick here
   • NG

     REPLACE ROOF CONSOLE BOX ASSEMBLY (Click here)

5. Click here

   INSPECT RAIN SENSOR

   
   
   1. 

      Reconnect the T1 rain sensor connector.

   2. Connect an oscilloscope to the rain sensor connector.

   3. Check for pulses.

      OK
      Tester Connection Condition Specified Condition T1-1 (MPX1) - T1-2 (ES) Power switch on (IG) Pulse generation

      Table 1. Text in Illustration

      *a	Component with harness connected (Rain Sensor)

   
   
   • OK

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

   • NG

     REPLACE RAIN SENSOR (Click here)