Inspection Procedure

1. Disconnect the W4 sensor connector.
2. Disconnect the W8 junction block connector.
3. Measure the resistance of the wire harness side connectors.

   Standard resistance 

   RESISTANCE SPECIFIED CONDITION
   
   

   Tester Connection	Specified Condition
   W4-1 (SIG) - W8-10 (IG2)	Below 1 Ω
   W4-2 (MPX) - W8-9 (MPX1)	Below 1 Ω
   W4-3 (ES) - W8-17 (GND2)	Below 1 Ω

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 1: Identifying W4 Rain And W8 Overhead Junction Block Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE RAIN SENSOR