Windshield Wiper & Washer - Evolution Mitsubishi Lancer Evolution VIII

WINDSHIELD LOW-SPEED (AND HIGH-SPEED) WIPER OPERATION

1. If the windshield low-speed wiper switch is turned to the ON position with the ignition switch at the "ACC" or "ON" position, the column switch sends a low-speed wiper ON and high-speed wiper OFF signals to the front-ECU. This turns the wiper signal on and the wiper speed control relay off (low-speed), causing the wipers to operate at low-speed.
2. If the windshield high-speed wiper switch is turned to the ON position, the column switch sends a low-speed wiper OFF and high-speed wiper ON signals to the front-ECU. This turns both the wiper signal and the wiper speed control relay on (high-speed), causing the wipers to operate at high-speed.

Note. The windshield wiper speed is adjustable with the built-in wiper speed control relay. High-speed operation takes place when the wiper speed control relay is set to "ON". Low-speed operation takes place when the wiper speed control relay is set to "OFF".

WINDSHIELD INTERMITTENT WIPER OPERATION

The ETACS-ECU calculates the wiper operation interval according to the voltage signal sent from the column switch. Then the ETACS-ECU sends a signal to the front-ECU. The front-ECU determines the wiper operation interval and turns on the wiper relay signal relay. This causes the wiper auto stop relay to turn on. Then the wiper auto stop relay will turn off after the wipers reach the park position. This causes the wiper signal relay and then the wipers to turn off. If the wiper signal relay remains off for the wiper operation interval, the relay turns on again, causing the wipers to operate in intermittent mode.

WINDSHIELD MIST WIPER OPERATION

1. If the windshield mist wiper switch is turned to the ON position with the ignition switch at the "ACC" or "ON" position, the mist wiper high-speed operation signal is sent to the front-ECU. This signal turns on the wiper speed control relay, causing the wipers to work at high-speed while the mist switch is on.
2. While the windshield mist wiper switch remains turned on when the intermittent mode is still working, the wipers work as the mist wiper. However, the wipers return to the intermittent mode again when the switch is changed back to "INT" position.
3. To prevent the windshield mist wiper from operating when the windshield wiper switch is turned OFF, the windshield mist wiper does not work for 0.5 second after the windshield intermittent wiper switch, the windshield low-speed wiper switch and the windshield high-speed wiper switch are turned OFF.

WINDSHIELD WASHER OPERATION

1. If the windshield washer switch is turned to ON position with the ignition switch at "ACC" or "ON" position, the windshield washer ON signal is sent to the front-ECU. After 0.3 second, the windshield wiper signal turns on. After the windshield washer switch signal turns off, the windshield wiper signal turns off in three seconds.

WINDSHIELD WIPER AND WASHER DIAGNOSIS

The windshield wiper and washer are controlled by the Simplified Wiring System (SWS). For troubleshooting, refer to SWS DIAGNOSIS .

Note. Even when the ETACS-ECU has failed, the windshield wiper can work at low speed as fail-safe mode. (Normally, the windshield wiper operates when the ignition switch is at the "ACC" position. But, if it enters the fail-safe mode, the wiper can operate only when the ignition switch is at the "ON" position.)

WINDSHIELD INTERMITTENT WIPER INSPECTION

1. If the windshield intermittent wiper interval adjusting knob is operated, the wiper interval should change.
2. Holding the windshield intermittent wiper interval adjusting knob, input the simulated vehicle speed with scan tool MB991958 (MUT-III sub Assembly) and check that the wiper interval changes as the vehicle speed changes.
3. If not carry out the troubleshooting.

Scheme 19

Note. For removal and installation of the wiper and washer switch, refer to COLUMN SWITCH .

<< A>> WINDSHIELD WIPER MOTOR ASSEMBLY REMOVAL

1. Remove the windshield wiper motor assembly mounting bolt. CAUTION: Be careful not to damage the windshield glass when the windshield wiper motor assembly is removed.
2. Use the flat-tipped screwdriver to disengage the link between the windshield wiper motor assembly and the link assembly to remove the windshield wiper motor assembly.

Scheme 20

>>A<< WIPER BLADE INSTALLATION

Scheme 21

>>B<< WIPER BLADE ASSEMBLY INSTALLATION

Install the wiper blade at the specified position (standard value)

Standard value: (A) 34 +/- 5 mm (1.3 +/- 0.20 inch)

Scheme 22

FRONT WIPER MOTOR CHECK

Inspect the windshield wiper motor by removing the harness connector with the motor attached to the vehicle.

WIPER MOTOR AT LOW OR HIGH SPEED OPERATION

Connect the battery to the windshield wiper motor to inspect the operation of motor rotation in low or high speed.

Scheme 23

WIPER MOTOR AT STOP POSITION OPERATION

1. Connect the battery to the windshield wiper motor to rotate the motor in a low speed as shown in the illustration (A) and disconnect the battery during rotation to stop the motor.
2. Connect between the terminals and the battery as shown in the illustration (B) and confirm whether the motor stops at the automatic stop position after rotating in a low speed.

Scheme 24

WINDSHIELD WIPER AND WINDSHIELD WASHER SWITCH CHECK

Check continuity between the switch terminals.

SPECIFIED CONDITION

Scheme 25

WINDSHIELD INTERMITTENT WIPER VOLUME CHECK

Check that the resistance varies between 0 and 1 kohm when the windshield intermittent volume is turned from FAST to SLOW after measuring resistance between connector terminals 3 and 6 at the column switch.

Scheme 26

Scheme 27

>>A<< WASHER TANK ASSEMBLY INSTALLATION

>>B<< REAR WASHER HOSE INSTALLATION

Align the marking on the rear washer hose with the clip as shown.

Scheme 28

FRONT WASHER MOTOR CHECK

1. Remove the washer tank assembly with the washer hose attached. Then fill the washer tank with water.
2. Check to see that the water is vigorously sprayed. When connecting the positive battery terminal to terminal number 2 and terminal number 1 to the negative battery terminal.

Scheme 29

WINDSHIELD WASHER FLUID EJECTION CHECK

Move the nozzle to adjust the position so that the spray is in the correct area.

Scheme 30

See also:
• SWS DIAGNOSIS
• COLUMN SWITCH