Mitsubishi Galant (2004+). Manual - part 268

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-263

WINDSHIELD WIPER AND WASHER

GENERAL DESCRIPTION CONCERNING THE WINDSHIELD WIPER AND WASHER

M1549021500116

The following ECUs affect the functions and control 
of the windshield wiper and washer.

Windshield wiper and washer control function

.

Intermittent control (Vehicle speed-dependent variable 
type)
ETACS-ECU uses the dial position of the variable intermittent 
wiper control switch and the vehicle speed signal sent by the 
combination meter to calculate the interval to be sent to the 
front-ECU.
NOTE: The speed-sensitive wiper can be customized on vehi-
cles equipped with a multi center display (middle grade type). 
Refer to 

P.54B-578

.

The front-ECU determines the intermittent time T1 from the 
input SWS data signal, and turns ON the windshield wiper drive 
signal. When the wiper is at the STOP position, the windshield 
wiper auto-stop signal goes OFF, then turns OFF the wind-
shield wiper drive signal. After the intermittent time T1 seconds 
from when the windshield wiper drive signal turned ON, the 
windshield wiper drive signal is turned ON again and the above 
operation is repeated.
NOTE: If the intermittent time T1 is within 2 seconds, the wiper 
is operated consecutively at LOW-speed by the front ECU.

.

FUNCTION

CONTROL ECU

Windshield wiper and washer 
control function

Intermittent control (Vehicle 
speed-dependent variable type)

ETACS-ECU, front-ECU, column 
switch

Mist wiper control

ETACS-ECU, column switch

Low speed wiper and high speed 
wiper control

ETACS-ECU, column switch

Washer control

ETACS-ECU, column switch

AC305397

Intermittent 

time T1 

(seconds)

Variable intermittent wiper

control switch position

Intermittent 

time T1 

(seconds)

Vehicle speed  (km/h)

When at SLOW position

Change in intermittent time 
according to vehicle speed

Change in intermittent time by variable 
intermittent wiper control switch (when 
vehicle is stationary)

0

100

19.0

0

FAST

SLOW

19.0

AB

60

4.6

14.0

4.6

1.6

When at FAST position

2.0

AC200355AC

ON

OFF

ON

OFF

WINDSHIELD
WIPER 
AUTOSTOP 
SIGNAL

WINDSHIELD
WIPER DRIVE
SIGNAL

T1

T1

T1: Intermittent time

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-264

Mist wiper control

When the ignition switch is in the ACC or ON posi-
tion, and the windshield mist wiper switch is turned 
ON, the front-ECU turns ON the windshield wiper 
drive signal. At the same time, the wiper speed 
switching relay is turned ON (HIGH-SPEED). While 
the windshield mist wiper switch is ON, the wind-
shield wiper will operate at high speed. Then, if the 
windshield mist wiper switch is turned off, the wiper 
operates at low speed until it stops at the predeter-
mined park position.

When the windshield mist switch is turned on briefly, 
the wiper operates once at low speed.
At the point the windshield mist switch is turned ON, 
if the windshield wiper has been operating intermit-
tently, the same operations as the above will be per-
formed while the windshield mist wiper switch is ON. 
After the windshield mist wiper switch goes OFF, the 
intermittent operations will be set again T1 seconds 
after the last windshield wiper auto-stop signal turn-
ing ON.

.

Low speed wiper and high speed wiper control

When the ignition switch is at the ACC or ON posi-
tion, and the windshield low speed wiper switch of 
the column switch is turned ON, the front-ECU turns 
ON the windshield wiper drive signal, turns OFF (LO) 
the windshield wiper speed relay, and operates the 

windshield wiper at low speed. Next, when the wind-
shield high speed wiper switch is turned ON, the 
windshield wiper drive signal is turned ON, the wind-
shield wiper speed switching relay is turned ON (HI), 
and the windshield wiper is operated at high speed.

.

AC200047AB

ON

OFF

ON

OFF

ON

OFF

ON (HIGH)

Windshield mist wiper switch

Windshield wiper auto-stop 
signal

Windshield wiper drive signal

Windshield wiper speed 
switching relay

OFF (LOW)

When windshield 
wiper switch is OFF

When windshield intermittent 
wiper is operating

T1: Intermittent time

T1

T1

AC005437AF

ON

OFF

ON

OFF

ON

OFF

ON (HIGH)

Windshield low-speed 
wiper switch

Windshield high-speed 
wiper switch

Windshield wiper auto-stop 
signal

ON

OFF

Windshield wiper 
drive signal

Windshield wiper 
speed switching relay OFF (LOW)

Low speed operations

High speed operations

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-265

Washer control

When the ignition switch is in the ACC or ON posi-
tion, and the windshield washer switch is turned ON, 
the front-ECU turns ON the windshield washer relay. 
The windshield wiper drive signal is turned ON after 
0.15 seconds until 2 seconds after the windshield 

washer switch goes OFF to operate the windshield 
wiper continuously. When the windshield washer 
switch is turned ON, if the windshield wiper is operat-
ing intermittently, intermittent operations will be con-
tinued after continuous operations.
NOTE: The wiper drive signal output time varies 
according to the conditions. Refer to the following 
table for details.

AC306460 AB

ON

OFF

ON

OFF

ON

OFF

ON

WINDSHIELD WASHER 
SWITCH

WINDSHIELD WASHER 
RELAY

WINDSHIELD WIPER 
AUTO-STOP SIGNAL

WINDSHIELD WIPER 
DRIVE SIGNAL

OFF

WHEN WINDSHIELD WIPER 
SWITCH IS OFF

WHEN WINDSHIELD INTERMITTENT 
WIPER IS OPERATING

T: WIPER OPERATING TIME AFTER WINDSHIELD WASHER SWITCH IS OFF

TI

TI

TI

T

T

t1

t1

t2

t2

t2: WINDSHIELD WASHER OPERATING TIME

t1: 0.15 SECONDS

TI: INTERMITTENT TIME

WHEN WIPER SWITCH IS OFF WHEN WIPER SWITCH IS SET 

TO INT

WHEN WIPER SWITCH IS SET 
TO LO OR HI

t2 0.15 

second or 
less

0.15 - 0.8 
second

0.8 
second or 
more

0.15 
second or 
less

0.15 - 0.8 
second

0.8 
second or 
more

0.15 
second or 
less

0.15 - 0.8 
second

0.8 
second or 
more

T

0 second 1.2 

seconds

2 seconds 0 second 1.2 

seconds

2 seconds 0 second 1.2 

seconds

2 seconds

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-266

General circuit diagram for the windshield wiper and washer

IGNITION
SWITCH (ACC)

IGNITION
SWITCH (IG2)

IGNITION
SWITCH (IG1)

RELAY BOX
(FUSE     )

FRONT-ECU

WINDSHIELD
WIPER
MOTOR

CIRCUIT
BREAKER

DATA LINK
CONNECTOR

VARIABLE
INTERMITTENT
WIPER
CONTROL
SWITCH

WINDSHIELD
WASHER
SWITCH

WINDSHIELD
WIPER
SWITCH

WINDSHIELD
WASHER
MOTOR

22

ETACS-
ECU

COLUMN-ECU

COLUMN 
SWITCH

JUNCTION 
BLOCK