Rain Sensor Circuit [08/2014 - ]: Procedure

1. Disconnect the H75 windshield wiper relay assembly connector.
2. Disconnect the T7 rain sensor connector.
3. 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

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  OK

OK 

See step  2

1. Reconnect the H75 windshield wiper relay assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. 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)

Result:  NG

NG 

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY 

(See article. Refer to REMOVAL [08/2014 - ] )

Result:  OK

OK 

See step  3

1. Reconnect the T7 rain sensor connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect an oscilloscope to the rain sensor connector.
3. 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)

Result:  OK

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(See article. Refer to PROBLEM SYMPTOMS TABLE [08/2014 - ] )

Result:  NG

NG 

REPLACE RAIN SENSOR 

(See article. Refer to REMOVAL [08/2014 - ] )