Mitsubishi Galant (2004+). Manual - part 1688

ECU FUNCTIONS AND CONTROLS IN THE SWS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-23

FLASHER TIMER

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Turn signal light
The turn signal light output (flashing signal) is turned ON when 
the ignition switch is ON and the turn signal light switch is ON 
(LH or RH.) If the front or rear turn signal light bulb has burned 
out, the flashing speed increases to indicate that the bulb has 
burned out.

.

Hazard warning light
Detects the signal where the hazard warning light switch input 
changes from OFF to ON, and reverse the flashing state 
according to this signal. The hazard warning lights toggle on 
and off whenever the hazard warning light switch is operated.
NOTE: The hazard warning light switch is a push-return type 
toggle switch.

.

Turn signal indicators
At the same time that the turn-signal lights are illuminated, the 
ETACS-ECU sends a signal to illuminate the turn-signal light 
indicator via the CAN bus line. The combination meter receives 
the transmitted signal and turns the turn-signal light indicator 
on and off.

FOG LIGHT

.

Fog light

The fog lights will illuminate only when the fog light 
switch is operated while the low-beam headlights are 
on.

AC005444AB

Ignition switch

Turn signal 

light switch LH

Turn signal 

light switch RH

Turn signal 

light output LH

Turn signal 

light output RH

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

AC005445AC

Hazard warning

light switch

Turn signal 

light output LH

Turn signal 

light output RH

ON

OFF

ON

OFF

ON

OFF

AC306459

ON

OFF

ON

OFF

ON

OFF

ON

OFF

Tail light switch

Headlight switch

Dimmer switch

Fog light switch

ON

OFF

Fog light

AB

ECU FUNCTIONS AND CONTROLS IN THE SWS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-24

The fog lights will be switched off when any of the fol-
lowing conditions are met. The fog lights will also be 
switched off automatically by headlight automatic 
shutoff function.

•

When the high-beam headlights are switched on, 
the fog lights will be switched off. If the low-beam 
headlights are switched on again, the fog lights 
will illuminate again.

•

When the headlight switch is turned off or the tail 
lights and headlights are off, the fog lights will be 
switched off. If the low-beam headlights are 
switched on again, the fog lights will not illumi-
nate again.

.

Fog light indicator
At the same time that the fog lights are illuminated, the 
ETACS-ECU sends a signal to illuminate the fog light indicator 
via the CAN bus line. The combination meter receives the 
transmitted signal and turns the fog light indicator on and off.

INTERIOR LIGHT

.

Interior light control function

The ETACS-ECU controls the interior lights by turn-
ing them on and off in the following way:

•

When a door is opened with the ignition switch 
off, the interior lights up to a luminance of 100 
percent. When a door is closed, the interior lights 
dim to a luminance of 65 percent, and go off 30 
seconds later. However if the ignition switch is 
turned ON or if a door is locked while the interior 
lights are dimming, the dome light will go off at 
that point.

•

When a door is opened with the ignition switch 
ON, the interior lights up at a luminance of 100 
percent. When a door is closed, the interior lights 
go off.

•

When the ignition key is removed with all doors 
closed, the interior lights up at a luminance of 100 
percent, and goes off 30 seconds later. However 
if the ignition key is inserted again or if a door is 
locked while the interior lights is lighting, the inte-
rior lights will go off at that point.

•

To check keyless entry operations more easily, 
the interior lights flash once when the doors are 
locked. When the doors are unlocked, the interior 
lights at a luminance of 100 percent, and go off 
15 seconds later.

NOTE: The dimmer function can be customized on 
vehicles equipped with a multi center display (middle 
grade type.) Refer to 

P.54B-28

.

NOTE: The dotted lines indicate that lighting mode 
when the ignition switch is turned ON, door is locked, 
or any door is opened during the timer illumination 
time.

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AC101555AF

ON

ACC

LOCK (OFF)

Key removed

ON (Any door is open)

OFF (All doors are closed)

LOCK

OFF

UNLOCK

100 %

65 %

0 %

t1: 30 seconds
t2: 15 seconds

t1

t1

t2

Ignition switch

Door switch

Keyless entry sytem
door lock or unlock signal

Interior light intensity

ECU FUNCTIONS AND CONTROLS IN THE SWS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-25

Interior light automatic-shutoff function

Illuminated interior lights such as the front dome 
light, etc. (all lights using the dome light fuse as the 
power supply) will automatically go off in the follow-
ing conditions to prevent the battery from discharging 
as a result of forgetting to turn off the lights or incom-
plete closing of the door.

•

When the ignition switch is turned off and more 
than 30 minutes pass by with the interior light illu-
minated, the interior lights will go off automati-
cally.

•

When the ignition switch is turned off and one of 
the door switches remains open for 30 minutes 
continuously, the interior lights will go off auto-
matically.

NOTE: The interior light automatic shutoff function 
can be customized on vehicles equipped with a multi 
center display (middle grade type.) Refer to 

P.54B-28

.

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Seat belt indicator

AC210856 AB

T1

T2

T2

ON

ON (Any door is open)

Illuminated

ACC

OFF

Extinguished

Ignition switch

Door switch

Interior light

ON

DOOR

Dome light switch

T1: 30 minutes
T2: Within 30 minutes

T1

T2

OFF (All doors are closed)

T1

AC305420

ON

OFF

ON (UNFASTENED)

OFF (FASTENED)

ON (ILLUMINATED)

OFF (NOT ILLUMINATED)

IGNITION SWITCH (IG1)

SEAT BELT  
SWITCH
(DRIVER'S SIDE)

SEAT BELT 
WARNING
LIGHT

AC

ECU FUNCTIONS AND CONTROLS IN THE SWS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-26

If any of the following conditions are met with the 
ignition switch at "ON" or "ST", the ETACS-ECU illu-
minates or extinguishes the seat belt indicator by 
using the driver's seat belt switch signal and the vehi-
cle speed signal from the combination meter.

•

The seat belt indicator illuminates when the seat 
belt switch is turned on (driver's seat belt is not 
fastened) with the ignition switch "ON.

•

Flashes and illuminates the indicator 12 cycles 
(after 0.5 seconds) if any of the following condi-
tions are met when sixty seconds or more have 
elapsed since the ignition switch is turned "ON". 
One cycle consists of five-second "flash" and 
then three-second "illuminate".

a. The vehicle speed has reached 8 km/h (5 

mph) while the seat belt switch is turned on 
(driver's seat belt is not fastened) with the 
ignition switch "ON.

b. The seat belt switch has been turned on 

(driver's seat belt has not been fastened) for 
at least ten seconds while the ignition switch 
has been turned "ON" and the vehicle speed 
has been 8 km/h (5 mph) or more.

NOTE: Once this timer operation has been acti-

vated, it will not be activated again until the 
vehicle speed reduces to 3 km/h (2 mph) or 
less even if any of the following conditions are 
met.

•

The indicator stops illuminating if the ignition 
swtich or the seat belt switch is turned off (the 
driver's seat belt is fastened) while the timer 
operation is active. 

.

AC305443

ON

OFF

ON (UNFASTENED)

OFF (FASTENED)

ON (ILLUMINATED)

OFF (NOT ILLUMINATED)

IGNITION SWITCH (IG1)

SEAT BELT 
SWITCH
(DRIVER'S SIDE)

SEAT BELT 
WARNING
LIGHT

8 km/h (5 mph)

0 km/h (0 mph)

VEHICLE SPEED

e

3 km/h (2 mph)

ON

OFF

a: 0.48 SECOND

b: 0.52 SECOND

c: 1 SECOND

d: 3 SECONDS

e: 60 SECONDS  OR MORE

f: 10 SECONDS

AB

a

g

g

g

f

b

c

c

c

c

c

d

12 CYCLES

1 CYCLE

12 CYCLES

12 CYCLES

12 CYCLES

SEAT BELT 
WARNING
LIGHT

g: 0.5 SECOND