On-Vehicle Inspection [08/2013 - ]

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT RAIN SENSOR

Disconnect the T1 rain sensor connector.

Fig 1: Rain Sensor Connector End View
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Voltage

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

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

Standard Resistance

Tester Connection	Condition	Specified Condition
2 (ES) - Body ground	Always	Below 1 Ω

TEXT IN ILLUSTRATION

*a	Front view of wire harness connector (to Rain Sensor)

If the result is not as specified, repair or replace the harness or connector.

Reconnect the T1 rain sensor connector.

Fig 2: Rain Sensor Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Connect an oscilloscope to the rain sensor connector.

Check for pulses.

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

TEXT IN ILLUSTRATION

*a	Component with harness connected (Rain Sensor)

If the result is not as specified, replace the rain sensor.