WIPER AND WASHER SWITCH INSPECTION

Windshield Wiper And Washer Switch

Auto wiper system type

1. Remove the wiper and washer switch. (See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION.)

2. Inspect for continuity between the wiper and washer switch terminals using a tester.

• If there is any malfunction, replace the wiper and washer switch.

Vehicle-speed sensing type

1. Remove the wiper and washer switch. (See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION.)

2. Inspect for continuity between the wiper and washer switch terminals using a tester.

• If there is any malfunction, replace the wiper and washer switch.

3. Connect the negative battery cable.

4. Inspect whether the vehicle speed signal to the wiper and washer switch terminal N (D) is input correctly using an oscilloscope.

• Connect the oscilloscope probes to the wiper and washer switch terminal N (D) (+) and terminal M (C) (-).

• Set oscilloscope to 1V/DIV (Y), 5ms/DIV (X).

• Verify that the wave pattern below is displayed while the vehicle is moving at 30 km/h {19 mph}.

Note

• As the vehicle speed increases, the frequency shortens.

5. If the vehicle speed input signal and continuity for the wiper and washer switch is correct, inspect the windshield wiper motor. (See WINDSHIELD WIPER MOTOR INSPECTION.)

• Even if the windshield wiper motor is normal, if the vehicle-speed-sensing wipers do not operate correctly, replace the wiper and washer switch.

Rear Wiper and Washer Switch

1. Remove the wiper and washer switch. (See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION.)

2. Inspect for continuity between the wiper and washer switch terminals using a tester.

• If there is any malfunction, replace the wiper and washer switch.