Mitsubishi 380. Manual - part 6

SWS DIAGNOSIS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-21

LAMPING

ITEM

ITEM NO. INPUT SIGNAL

DISPLAY ON 
DIAGNOSTIC TOOL

NORMAL CONDITION

H/L AUTO-CUT 00

Headlight switch

HEADLAMP SW (COLUMN 
ECU)

Either is ON

01

Taillight switch

TAILLAMP SW (COLUMN 
ECU)

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

OFF

32

Front door switch

FRONT DOOR SW (ETACS 
ECU)

ON

35

Headlight 
automatic shutoff 
function

H/L AUTO-CUT (ETACS 
ECU)

ON

70

Response by the 
front-ECU

FRONT ECU ACK (FRONT 
ECU)

NORMAL ACK or SLEEP 
ACK

OFF

00

Headlight switch

HEADLAMP SW (COLUMN 
ECU)

OFF

01

Tail lamp switch

TAILLAMP SW (COLUMN 
ECU)

OFF

03

Passing lamp 
switch

PASSING SW (COLUMN 
ECU)

OFF

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON or OFF

35

Headlight 
automatic shutoff 
function

H/L AUTO-CUT (ETACS 
ECU)

OFF

70

Response by the 
front-ECU

FRONT ECU ACK (FRONT 
ECU)

NORMAL ACK or SLEEP 
ACK

HEADLAMP HI 00

Headlight switch

HEADLAMP SW (COLUMN 
ECU)

ON

02

Dimmer switch

DIMMER SW (COLUMN 
ECU)

ON or OFF

03

Passing lamp 
switch

PASSING SW (COLUMN 
ECU)

OFF

30

Ignition switch 
(IG1)

IG SW (IG1) (COLUMN 
ECU)

ON

35

Headlight 
automatic shutoff 
function

H/L AUTO-CUT (COLUMN 
ECU)

OFF

70

Response by the 
front-ECU

FRONT ECU ACK 
(COLUMN ECU)

HI-BEAM ACK

SWS DIAGNOSIS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-22

NOTE:  When checking the input signals (off, tail, 
low-beam or high-beam), turn the ignition switch to 
the "ON" position in order to disable the headlamp 
automatic shutoff function. However, since the 
headlamp operation does not depend on the ignition 
switch positions, the diagnostic tool MB991958 
(MUT-III Sub Assembly) does not display the title 

"IGNITION SWITCH".

HEADLAMP 
LO

00

Headlight switch

HEADLAMP SW (COLUMN 
ECU)

ON

03

Passing lamp 
switch

PASSING SW (COLUMN 
ECU)

OFF

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON or OFF

35

Headlight 
automatic shutoff 
function

H/L AUTO-CUT (ETACS 
ECU)

OFF

70

Response by the 
front-ECU

FRONT ECU ACK (FRONT 
ECU)

NORMAL ACK

PASSING 
LAMP

03

Passing lamp 
switch

PASSING SW (COLUMN 
ECU)

ON

70

Response by the 
front-ECU

FRONT ECU ACK (FRONT 
ECU)

NORMAL ACK or HI-BEAM 
ACK

F.FOG LAMP

00

Headlight switch

HEADLAMP SW (COLUMN 
ECU)

ON

36

Front fog lamp 
switch

F.FOG LAMP (COLUMN 
ECU)

ON

35

Headlight 
automatic shutoff 
function

H/L AUTO-CUT (ETACS 
ECU)

OFF

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON or OFF

70

Response by the 
front-ECU

FRONT ECU ACK (FRONT 
ECU)

NORMAL ACK or HI-BEAM 
ACK

TAIL LAMP

00

Headlight switch

HEADLAMP SW (COLUMN 
ECU)

OFF

01

Tail lamp switch

TAILLAMP SW (COLUMN 
ECU)

ON

03

Passing lamp 
switch

PASSING SW (COLUMN 
ECU)

OFF

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON or OFF

35

Headlight 
automatic shutoff 
function

H/L AUTO-CUT (ETACS 
ECU)

OFF

70

Response by the 
front-ECU

FRONT ECU ACK (FRONT 
ECU)

NORMAL ACK

ITEM

ITEM NO. INPUT SIGNAL

DISPLAY ON 
DIAGNOSTIC TOOL

NORMAL CONDITION

SWS DIAGNOSIS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-23

For checking item "HEADLAMP HI", the diagnostic 
tool MB991958 (MUT-III Sub Assembly) displays 
"OFF" on the item No.2 "DIMMER SW" when the 
headlamps are at high-beam. Therefore, the 
diagnostic tool MB991958 (MUT-III Sub Assembly) 
should display "ON" momentarily when the dimmer 
switch is operated.

.

TURN SIGNAL

.

BUZZER

NOTE:  The headlamp automatic shutoff function 
operates approximately one second after the lighting 
monitor tone alarm starts sounding, and then the 
tone alarm ceases sounding.

.

ITEM

ITEM NO. INPUT SIGNAL

DISPLAY ON 
DIAGNOSTIC TOOL

NORMAL CONDITION

TURN-SIG.LH

10

Turn-signal lamp 
switch (RH)

T/S RH SW (COLUMN 
ECU)

OFF

11

Turn-signal lamp 
switch (LH)

T/S LH SW (COLUMN 
ECU)

ON

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON

TURN-SIG.RH

10

Turn-signal lamp 
switch (RH)

T/S RH SW (COLUMN 
ECU)

ON

11

Turn-signal lamp 
switch (LH)

T/S LH SW (COLUMN 
ECU)

OFF

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON

ITEM

ITEM NO. INPUT SIGNAL

DISPLAY ON DIAGNOSTIC 
TOOL

NORMAL CONDITION

LGT 
MONI.ALRM

00

Headlamp switch

HEADLAMP SW (COLUMN 
ECU)

Either is ON

01

Tail lamp switch

TAILLAMP SW (COLUMN 
ECU)

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

OFF

32

Front door switch

FRONT DOOR SW (ETACS 
ECU)

ON

35

Headlamp 
automatic shutoff 
function

H/L AUTO-CUT (ETACS 
ECU)

OFF

43

Tone alarm

BUZZER (ETACS ECU)

ON

OTHER 
ALARM

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON

43

Tone alarm

BUZZER (ETACS ECU)

ON

SWS DIAGNOSIS

SIMPLIFIED WIRING SYSTEM (SWS)

54B-24

SUNROOF

PULSE CHECK

M1549015100562

1. The input signals (signals other than SWS 

communication line signals), which are 
compatible with the SWS monitor by using the 
diagnostic tool MB991958 (MUT-III Sub 
Assembly) or voltmeter, can be confirmed by the 
Pulse Check.

2. Use the diagnostic tool MB991958 (MUT-III Sub 

Assembly) or voltmeter to check the following 
input signals.

NOTE:  If a problem is found in the Pulse Check, 
refer to Input Signal Chart 

P.54B-61

.

Switches and their conditions, which are applicable 
for Pulse Check

ITEM

ITEM NO. INPUT SIGNAL

DISPLAY ON 
DIAGNOSTIC TOOL

NORMAL CONDITION

SUNROOF 
OPE.

30

Ignition switch 
(IG1)

IG SW (IG1) (ETACS ECU)

ON

72

Response by the 
sunroof-ECU

S/R ECU ACK (SUNROOF 
ECU)

INPUT CHECK (only 
momentarily when switch is 
operated)

INPUT SIGNAL

REQUIREMENTS FOR SOUNDING TONE 
ALARM

Key reminder switch

When the ignition key is pulled out

Hazard warning lamp switch

When the switch is turned from off to on

Door switches

A door is opened when all the doors are 
closed

Door lock key cylinder switch

When a door is locked or unlocked by a key 
cylinder

Door lock actuators

Move the door lock knob from lock position 
to unlock position or vice versa

Door lock switch (incorporated in the power window main 
switch and front power window sub switch)

When a door is locked or unlocked by a door 
lock switch

Keyless entry transmitter

When the switch is turned from off to on

Interior lamp loaded signal

Illuminates the interior lamps