Rain Sensor Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Rain Sensor / Data List.
5. Check the Data List for proper functioning of the rain sensor.
   RAIN SENSOR:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Wiper SW Lo Signal	Front wiper switch LO signal / ON or OFF	ON: Front wiper switch in LO position OFF: Front wiper switch in a position except LO	-
   Wiper SW Hi Signal	Front wiper switch HI signal / ON or OFF	ON: Front wiper switch in HI position OFF: Front wiper switch in a position except HI	-
   Wiper SW Auto Signal	Front wiper switch AUTO signal / ON or OFF	ON: Front wiper switch in HI position OFF: Front wiper switch in a position except HI	-
   Washer SW Signal	Washer switch signal / ON or OFF	ON: Washer switch ON OFF: Washer switch OFF	-

   OK

   The normal conditions listed above are displayed.

NG → See step   2 

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

1. Disconnect the connector from the rain sensor.
   Fig 1: Checking Rain Sensor Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Resistance

   Tester Connection	Condition	Specified Condition
   N3-3 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the connector from the rain sensor.
   Fig 2: Checking Rain Sensor Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Voltage

   Tester Connection	Condition	Specified Condition
   N3-1 - Body ground	Ignition switch off	Below 1 V
   N3-1 - Body ground	Ignition switch on (IG)	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE