Mitsubishi Galant (2004+). Manual - part 1683

COMMUNICATION METHOD

SIMPLIFIED WIRING SYSTEM (SWS)

54B-3

COMMUNICATION METHOD

M2541001000226

As shown in the figure, SWS communications con-
nect the ETACS-ECU, the column switch (in the col-
umn ECU), the front ECU, and the sunroof-ECU. 
CAN communications connect the ETACS-ECU, the 
powertrain control module, the A/C-ECU, the 
SRS-ECU, the combination meter, the ABS-ECU, 
and the multi center display unit (middle grade type). 
These two communications groups are connected to 
form a dedicated network for sending multiplex data.

AC306603

ETACS-ECU

FRONT-ECU

COLUMN SWITCH
(COLUMN-ECU)

SUNROOF-ECU

SWS

CAN

A/C-ECU

POWERTRAIN CONTROL
MODULE

COMBINATION METER

MULTI CENTER
DISPLAY UNIT
(MIDDLE GRADE TYPE)

AB

Single-direction communication

Bidirectional communication

ABS-ECU

SRS-ECU

MULTI-DISTRIBUTION INPUT/OUTPUT BY CIRCUIT

SIMPLIFIED WIRING SYSTEM (SWS)

54B-4

MULTI-DISTRIBUTION INPUT/OUTPUT BY CIRCUIT

M2541002000230

Multi-distribution is employed by the following cir-
cuits. The relation of the input switches, sensors, 
ECUs connected by multi-distribution lines, and out-
puts are also shown below.

TONE ALARM

•

Ignition key reminder tone alarm function

•

Lights still ON reminder warning function

•

Seat belt tone alarm function

•

Door ajar warning buzzer

•

Multi center display operation tone <vehicles with 
multi center display (middle grade type)>

•

Turn-signal light buzzer

AC305309

Circuit and Input Switch and Sensor

ECUs and Switches 
Connected by Multi-
Distribution

Output Side

• 

Ignition switch (IG1)

• 

All door switch

• 

Key reminder switch

Tone alarm
 (built-in ETACS-ECU)

ETACS-ECU

Column switch
(Lighting or turn
signal light switch)

AB

Combination meter

• 

Ignition switch (IG1)

• 

Seat belt switch

• 

Vehicle speed signal

: CAN communication line

: SWS communication line

Multi center display unit
(middle grade type)

•  

Tone alarm sound signal

MULTI-DISTRIBUTION INPUT/OUTPUT BY CIRCUIT

SIMPLIFIED WIRING SYSTEM (SWS)

54B-5

Windshield wiper washer

•

Windshield mist wiper

•

Vehicle speed-dependent variable windshield 
intermittent wiper

•

Windshield low speed wiper

•

Windshield high speed wiper

•

Windshield washer

AC305313

Circuit and Input Switch and Sensor

ECUs and Switches 
Connected by Multi-
Distribution

Output Side

AB

• 

Ignition switch (ACC)

Column switch 
(Windshield wiper
washer switch)

• 

Windshield wiper motor

• 

Windshield washer motor

Column switch (Windshield 
intermittent wiper volume)

Front-ECU

A/C-ECU

• 

Ignition switch (ACC)

ETACS-ECU

: CAN communication line

: SWS communication line

Combination meter

• 

Vehicle speed signal

Multi center display unit
(middle grade type)

• 

Ignition switch (ACC)

MULTI-DISTRIBUTION INPUT/OUTPUT BY CIRCUIT

SIMPLIFIED WIRING SYSTEM (SWS)

54B-6

Lighting

•

Headlight, taillight

•

Headlight automatic shutoff function

•

Fog light

Flasher

•

Turn signal light

•

Hazard warning light

AC305314

Circuit and Input Switch and Sensor

ECUs and Switches 
Connected by Multi-
Distribution

Output Side

AB

• 

Ignition switch (IG1)

• 

Driver's door switch

• 

Fog light switch

Column switch
(Lighting switch)

• 

Headlights

• 

Taillights

• 

Fog lights

•  

Illumination lights

Front-ECU

• 

Ignition switch (IG2)

ETACS-ECU

Combination meter

•  

High beam indicator and 

   Fog light indicator

•  

Illumination lights

: CAN communication line

: SWS communication line

Combination meter

• 

Ignition switch (IG1)

AC305317

Circuit and Input Switch and Sensor

ECUs and Switches 
Connected by Multi-
Distribution

Output Side

AB

Combination meter (Turn 
signal lights indicator)

Turn signal lights

Column switch
(Turn signal light
switch)

• 

Ignition switch (IG1)

• 

Hazard warning light switch

ETACS-ECU

: CAN communication line

: SWS communication line

Combination meter

• 

Ignition switch (IG1)