Mitsubishi Montero (2002-2004). Manual - part 235

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-17

• TURN SIGNAL

• BUZZER

NOTE: The headlight automatic shutdown function 
works in 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 SCAN TOOL NORMAL CONDITION

TURN-SIG.LH

10

Turn-signal light 
switch (RH)

T/S RH SW

OFF

11

Turn-signal light 
switch (LH)

T/S LH SW

ON

30

Ignition switch 
(IG1)

IG SW (IG1)

ON

TURN-SIG.RH

10

Turn-signal light 
switch (RH)

T/S RH SW

ON

11

Turn-signal light 
switch (LH)

T/S LH SW

OFF

30

Ignition switch 
(IG1)

IG SW (IG1)

ON

ITEMS

ITEM 
NO.

INPUT SIGNAL

DISPLAY ON SCAN TOOL NORMAL CONDITION

CENTR.DIS.AL
M

43

Tone alarm

BUZZER

ON

60

BEEP DATA

beep data

ON (2 kHz) (only 
momentarily when switch is 
operated)

KEY 
REMND.ALM

30

Ignition switch 
(IG1)

IG SW (IG1)

OFF

32

Front door switch

FRONT DOOR SW

ON

43

Tone alarm

BUZZER

ON

LGT 
MONI.ALM

00

Headlight switch

HEADLIGHT SW

Either is on

01

Tail light switch

TAILLIGHT SW

30

Ignition switch 
(IG1)

IG SW (IG1)

OFF

32

Front door switch

FRONT DOOR SW

ON

35

Headlight 
automatic 
shutdown function

H/L AUTO-CUT

OFF

43

Tone alarm

BUZZER

ON

OTHER 
ALARM

30

Ignition switch 
(IG1)

IG SW (IG1)

ON

43

Tone alarm

BUZZER

ON

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-18

• SUNROOF

• THEFT-ALARM

PULSE CHECK

M1549015100216

1. The input signals (signals other than SWS 

communication line signals), which are 
compatible with the SWS monitor by using the 
scan tool or voltmeter, can be confirmed by the 
Pulse Check. (Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-

6

.)

2. Use the scan tool or voltmeter to check the 

following input signals.
NOTE: If a problem is found the Pulse Check, 
proceed to the Problems during Input Signal 
Check <Scan tool or voltmeter> (Refer to 

P.54Bc-

2

).

Switches and their conditions, which are applicable 
for Pulse Check

ITEM

ITEM 
NO.

INPUT SIGNAL

DISPLAY ON SCAN TOOL NORMAL CONDITION

SUNROOF 
OPE.

30

Ignition switch 
(IG1)

IG SW (IG1)

ON

72

Response by the 
sunroof-ECU

S/R ECU ACK

INPUT CHECK (only 
momentarily when switch is 
operated)

ITEM

ITEM 
NO.

INPUT SIGNAL

DISPLAY ON SCAN TOOL NORMAL CONDITION

THEFT-ALARM 45

Theft-alarm 
headlight

THEFTALM. H/L

ON

70

Response by the 
front-ECU

FRONT ECU ACK

NORMAL ACK

INPUT SIGNAL

REQUIREMENT FOR SOUNDING 
TONE ALARM

Key reminder switch

When the inserted ignition key is pulled 
out

Hazard light switch

When the switch is turned from off to on

Seat belt which

When the seat belt is fastened

All door switches (excluding front door switch)

Either of the doors (excluding front door) 
is opened

Driver's, front passenger's or back door lock key cylinder switch When the key cylinder is locked or 

unlocked

Driver's, front passenger's, rear or back door lock actuator

When the driver's key cylinder or inside 
lock knob is unlocked or locked

Door lock switch (incorporated in the power window main 
switch)

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

Hood switch

When the hood is opened

Keyless entry system transmitter

Switches

When the switch is turned from off to on

CHECK AT ECU TERMINAL

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-19

CHECK AT ECU TERMINAL

M1549001200436

1. ETACS-ECU

NOTE: *: The terminal 1 to 20 connectors can not be 
measured as the ETACS-ECU is installed directly on 
the junction block. Therefore, this information is only 
for reference.

19 20

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

21 22 23 24 25 26 27 28 29 30

31 32 33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56

ACX01511

*

AB

TERMINAL 
NO.

INSPECTION ITEM

INSPECTION CONDITION

NORMAL VALUE

1

Output to rear wiper

When rear wiper is operating

Battery positive voltage

2

Power supply to ignition switch 
(ACC)

Ignition switch: "ACC"

Battery positive voltage

3

Output to rear washer

When rear washer is operating

Battery positive voltage

4

Output to door lock

When door lock actuator is 
operating (doors locked)

Battery positive voltage

5

Input of automatic stop signal to 
rear wiper

When rear wiper is operating

Battery positive voltage

6

Battery power supply (for ECU)

Always

Battery positive voltage

7

Input from door switches

Either of door switches: ON 
(Door open)

0 V

8

Output to power window relay

When the power windows can 
work

2 V or less

9

Input from driver's door switch

Driver's door switch: ON (Driver's 
door open)

0 V

11

Battery power supply (for turn-
signal light)

Always

Battery positive voltage

12

Battery positive voltage (for 
central door lock)

Always

Battery positive voltage

14

Output to turn-signal light (LH)

When turn-signal light (LH) is on Battery positive voltage

15

Output to turn-signal light (RH)

When turn-signal light (RH) is on Battery positive voltage

16

Power supply to ignition switch 
(IG1)

Ignition switch: "ON"

Battery positive voltage

17

Output to door unlock (excluding 
direr's door)

When door lock actuator is 
operating (doors unlocked) 

Battery positive voltage

18

Output to dome light

When dome light is on

2 V or less

19

Output to door unlock (for 
driver's door)

When driver's door lock actuator 
is operating (doors unlocked)

Battery positive voltage

20

Ground (for ECU)

Always

0 V

21

SWS communication line

Always

0 

− 12 V (pulse signal)

22

Input of diagnosis indication 
selection

When scan tool is connected

0 V

23

Ground (for sensor)

Always

0 V

CHECK AT ECU TERMINAL

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-20

24

Input from fog light switch

Fog light switch: ON (When the 
switch is depressed)

0 V

25

Input of driver's seat belt switch 
signal

Driver's seat belt switch: ON 
(seat belts unfastened)

0 V

26

Input of key reminder switch 
signal

Key reminder switch: ON 
(ignition key removed)

0 V

27

Input of hazard warning light 
switch signal

Hazard warning light switch: ON 
(When the switch is depressed)

0 V

28

Input of back door lock key 
cylinder switch (LOCK) signal

Back door lock key cylinder 
switch: LOCK

0 V

29

Input of front passengers's door 
switch signal

Front passenger's door switch: 
ON (Front passenger's door 
open)

0 V

31

Output of data request signal

Always

0 

− 5 V (pulse signal)

34

Input of signal from windshield 
intermittent wiper interval 
adjusting knob

Ignition switch: "ACC,"
Windshield intermittent wiper 
interval adjusting knob: "FAST" 
→ "SLOW"

0 

→ 2.5 V

35

Input of "R" position signal from 
transmission range switch

Ignition switch: "ON,"
Selector lever: "R"

Battery positive voltage

36

Output to ignition key hole 
illumination light

When ignition key hole 
illumination light is on

2 V or less

37

Output to data link connector

When DTC sets

0 

− 12 V (pulse signal)

When input check signal is 
output

0 

− 12 V (when input 

pulse signal is 
fluctuating)

39

Output to seat belt warning light When seat belt warning light is 

on

2 V or less

40

Output to the theft-alarm 
indicator light

When the theft-alarm indicator 
light is on

2 V or less

42

Output to horn

When a horn sounds by the 
keyless entry horn answerback 
function or the theft-alarm 
system

2 V or less

45

Input of back door lock key 
cylinder switch (UNLOCK) signal

Back door lock key cylinder 
switch: UNLOCK

0 V

46

Input of front passenger's door 
lock actuator switch (UNLOCK) 
signal

Front passenger's door lock 
actuator switch: UNLOCK

0 V

47

Input of rear and back door lock 
actuator switch (UNLOCK) 
signals

Rear or back door lock actuator 
switch: UNLOCK

0 V

48

Input signal from the hood switch Hood switch: ON (Hood open)

0 V

49

Output to the theft-alarm horn

When theft-alarm horn is 
sounding

2 V or less

TERMINAL 
NO.

INSPECTION ITEM

INSPECTION CONDITION

NORMAL VALUE