Toyota CH-R Service Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT RAIN SENSOR

(a) Disconnect the R1 rain sensor connector.

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

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
R1-4 (SIG) - R1-2 (ES)	Ignition switch ON	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
R1-2 (ES) - Body ground	Always	Below 1 Ω

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

(d) Reconnect the R1 rain sensor connector.

*a	Component with harness connected (Rain Sensor)

(e) Connect an oscilloscope to the rain sensor connector.

(f) Check for pulses.

OK:

Tester Connection	Condition	Specified Condition
3 (MPX) - 2 (ES)	Ignition switch ON	Pulse generation

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

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Toyota C-HR (AX20) 2023-2025 Owner's Manual