Mitsubishi Evolution X. Manual - part 844

WINDSHIELD WIPER AND WASHER

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EXTERIOR

51-59

INSPECTION PROCEDURE 10: The windshield washer does not work normally.

FUSIBLE
LINK

34

AC708856

WINDSHIELD
WASHER
RELAY

NO
USED
RELAY

WASHER
MOTOR

Windshield Washer Motor Circuit

INPUT SIGNAL 
(COLUMN-ECU)

WINDSHIELD 
WASHER

AB

ACC
RELAY3

AC708950

Connector: C-47

AE

AC708972

Connectors: C-304, C-309

AE

C-309 (B)

C-304

WINDSHIELD WIPER AND WASHER

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EXTERIOR

51-60

.

CIRCUIT OPERATION

The windshield washer switch sends a signal 
through the column-ECU (incorporated in the column 
switch) to the ETACS-ECU. If the column-ECU sends 
a windshield washer switch "ON" signal to the 
ETACS-ECU, the ETACS-ECU turns on the relay 
(incorporated in the ETACS-ECU), thus causing the 
washer motor to be turned on.

.

TECHNICAL DESCRIPTION (COMMENT)

If the windshield washer does not work normally, the 
washer motor, the column switch (windshield wiper 
and washer switch) or the ETACS-ECU may be 
defective.

.

TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

• The washer motor may be defective

• The column switch may be defective

• The ETACS-ECU may be defective

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Verify the windshield wiper operation.
Q: Does the windshield wiper operate normally?

YES : Go to Step 2.
NO :  Refer to Inspection Procedure 1 "The windshield 

wipers do not work at all 

P.51-25

."

AC708955AI

Connector: D-20

D-20 (B)

WINDSHIELD WIPER AND WASHER

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EXTERIOR

51-61

STEP 2. Use the scan tool MB991958 to check if an 
ETACS-related diagnostic trouble code is set. 
Connect the scan tool. Refer to GROUP 54A ETACS, "How to 
connect the scan tool (M.U.T.-III) 

P.54A-579

."

Q: Is the diagnostic trouble code set?

YES : Diagnose the ETACS-ECU. Refer to GROUP 54A 

ETACS, "Diagnostic trouble code chart 

P.54A-582

."

NO :  Go to Step 3.

STEP 3. Check the input signal related to the windshield 
washer operation.

• Ignition switch: ACC

• Windshield washer switch: ON

OK: Normal condition is displayed.

Q: Is the check result normal?

NO :  Go to Step 4.
YES : Refer to GROUP 54A 

− ETACS, Input signal chart 

P.54A-639

.

STEP 4. Check windshield washer motor connector D-20 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is windshield washer motor connector D-20 in good 

condition?
YES : Go to Step 5.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the windshield wiper works 

normally.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

Item No.

Display on scan tool Normal condition

Item 237

Front washer

ON

WINDSHIELD WIPER AND WASHER

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EXTERIOR

51-62

STEP 5. Check the operation of windshield washer motor.
(1) Disconnect windshield washer motor connector D-20 and 

check at windshield washer motor connector side.

(2) Fill the windshield washer tank with washer fluid.
(3) When battery voltage is applied between terminals 1 and 2, 

washer fluid should spray out.

Q: Does the washer motor operate normally?

YES : Go to Step 6.
NO :  Replace the washer motor. Verify that the windshield 

washer works normally.

STEP 6. Check ETACS-ECU connector C-304 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-304 in good condition?

YES : Go to Step 7.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the windshield washer works 

normally.

STEP 7. Measure the voltage at ETACS-ECU connector 
C-304.
(1) Disconnect ETACS-ECU connector C-304 and measure the 

resistance available at the wiring harness side of the 
connector.

(2) Ignition switch: ACC
(3) windshield washer switch: ON
(4) Measure the voltage between C-304 ETACS-ECU 

connector terminal No. 13 and body ground.

OK: Battery voltage

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 10.
NO :  Go to Step 8.

AC608513

AB

AC608254 CV

Harness side: C-304