Mitsubishi Evolution X. Manual - part 837

WINDSHIELD WIPER AND WASHER

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EXTERIOR

51-31

STEP 11. 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 wiper switch: HI
(4) Measure the voltage between C-304 ETACS-ECU 

connector terminal No. 5 and body ground.

OK: Battery voltage

(5) windshield wiper switch: LO

(6) Measure the voltage between C-304 ETACS-ECU 

connector terminal No. 6 and body ground.

OK: Battery voltage

Q: Is the measured voltage approximately 12 volts (battery 

positive voltage)?
YES : Go to Step 13.
NO :  Go to Step 12.

STEP 12. Check the wiring harness between ETACS-ECU 
connector C-304 (terminals 5, 6) and windshield wiper 
motor connector A-06 (terminals 4, 1).

• Check the input and output lines for open or short circuit.

Q: Is the wiring harness between ETACS-ECU connector 

C-304 (terminals 5, 6) and windshield wiper motor 
connector A-06 (terminals 4, 1) in good condition?
YES : Go to Step 13.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Cables and wire check 

P.00E-12

. 

STEP 13. Retest the system.
Check that the windshield wipers work normally.
Q: Is the check result normal?

YES : Intermittent malfunction. Refer to GROUP 00, How to 

cope with intermittent malfunction 

P.00-15

. 

NO :  Replace the ETACS-ECU.

AC608254CQ

Harness side: C-304

AC608254 CR

Harness side: C-304

WINDSHIELD WIPER AND WASHER

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EXTERIOR

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INSPECTION PROCEDURE 2: The windshield wipers do not work when the wiper switch is at the 
"INT", "Washer" or "Mist" position. However, the wipers work at low speed when the switch is at the 
"Lo" or "Hi" position.

.

TECHNICAL DESCRIPTION (COMMENT)

This system may be at fail-safe mode if the LIN com-
munication line is defective.

If the system cannot receive any signal from the col-
umn switch (windshield wiper and washer switch) 
due to a open circuit in the LIN communication line or 
other reasons, the system will enter the fail-safe 
mode when the ignition switch is at the "ACC" posi-
tion.

.

AC708841

ETACS-ECU

ACC
RELAY3

Windshield Wiper Motor Circuit

WINDSHIELD 
WIPER 
MOTOR

CIRCUIT
BREAKER

· WINDSHIELD WIPER HI SPEED SWITCH
· WINDSHIELD WIPER INTERMIT SWITCH
· WINDSHIELD WIPER LO SPEED SWITCH

· WINDSHIELD WIPER MIST SWITCH

INPUT SIGNAL

WINDSHIELD
WIPER SPEED 
SWITCHING 
RELAY

AB

WINDSHIELD WIPER AND WASHER

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TROUBLESHOOTING HINTS

• The wiring harness or connectors may have 

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

• The column switch may be defective

• The ETACS-ECU may be defective

• The LIN bus line 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. 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 2.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

WINDSHIELD WIPER AND WASHER

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STEP 2. Using scan tool MB991958, check data list. 
Check the input signal related to the windshield wiper opera-
tion.

• Ignition switch: ACC

• Operate the windshield wiper switch at each switch posi-

tion.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Troubleshoot the ETACS-ECU. Refer to ETACS, 

Diagnosis - Inspection Procedure 12 "ETACS-ECU 
does not receive any signal from the column switch 
signal." 

P.54A-639

.

STEP 3. Retest the system.
Check that the windshield wipers work normally.
Q: Is the check result normal?

YES : Intermittent malfunction. Refer to GROUP 00, How to 

cope with intermittent malfunction 

P.00-15

. 

NO :  Replace the ETACS-ECU.

Item No.

Item name

Windshield 
wiper 
switch 
position

Normal 
condition

Item 235

Front wiper 
ACT

LO

ON

HI

INT

ON and 
OFF

MIST

ON

Item 236

Front wiper 
Lo/Hi

LO

OFF

HI

ON

INT

OFF

MIST

ON