Mitsubishi Montero (2002-2004). Manual - part 233

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-9

HOW TO CHECK ECUs

M1549014900208

1. Use the scan tool and the SWS monitor kit to 

check ECUs. (Refer to MUT-II Reference Manual)

2. The following ECUs can be checked by using the 

scan tool and the SWS monitor kit.

NOTE:  The "ECU COMM CHK" function checks a 
communication status of ECUs "NG" does not 
always mean ECU malfunction. If a malfunction is 
found by the "ECU COMM CHK," proceed "Symptom 
Procedure" (Refer to 

P.54Bb-2

).

SWS monitor kit-compatible ECUs and their conditions

NOTE: 

.

•

*

1

: If the ignition switch is turned to the "LOCK" 

(OFF) or "ACC" when "NG" is displayed beside 
the "ETACS ECU" or the signal request line is 
abnormal, the scan tool shows "NG" beside the 
"COLUMN ECU."

•

*

2

: When "NG" is displayed beside the "ETACS 

ECU," the scan tool shows "NG" beside the 
"FRONT ECU" and "SUNROOF ECU."

•

*

3

: If "NG" is displayed beside the "COLUMN 

ECU," "NG" is displayed on the "CENTER DISP."

SERVICE DATA CHECK

M1549015000208

1. Use the scan tool and the SWS monitor kit to 

check "Service Data."
This "Service Data" check is applicable for 
signals, which are transmitted and received 
through the SWS communication line. For input 
signals, which are not compatible with the SWS 
monitor kit, refer to the Pulse Check procedure 
(by using the scan tool or voltmeter) 

P.54Ba-18

.

2. The following input signals can be checked by 

using the scan tool and the SWS monitor kit.
NOTE: If a problem is found in the "Service Data" 
check, refer to the Problems during Input Signal 
Check <SWS monitor>. (Refer to 

P.54Bc-2

.)

<DATA LIST REFERENCE TABLE>

• COLUMN ECU (column switch)

ECUs TO BE CHECKED

DISPLAY ON SCAN 
TOOL

NORMAL 
CONDITION

ECU CONDITION

Column switch (column-
ECU)

COLUMN ECU

OK*

1

All of the column switch, power 
supply, ground and interconnecting 
communication line are normal

ETACS-ECU

ETACS ECU

OK

All of the ETACS-ECU switch, power 
supply, ground and interconnecting 
communication line are normal

Front-ECU

FRONT ECU

OK*

2

All of the front-ECU, power supply, 
ground and interconnecting 
communication line are normal

Sunroof motor assembly 
(sunroof-ECU)

SUNROOF ECU

OK*

2

All of the sunroof motor assembly, 
power supply, ground and 
interconnecting communication line 
are normal

RV meter

CENTER DISP.

OK*

3

All of the RV meter, power supply, 
ground and interconnecting 
communication line are normal

Other SWS-related ECUs

Other ECUs

NG

ECUs are not used

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-10

CHECK 
ITEM

ITEM 
NO.

DISPLAY ON 
SCAN TOOL

CHECK CONDITION

NORMAL 
CONDITION

Dimmer 
switch

02

DIMMER SW

Dimmer switch: ON

ON

Dimmer switch: OFF

OFF

Windshield 
washer 
switch

09

FRONT 
WASH.SW

Windshield washer switch: ON

ON

Windshield washer switch: OFF

OFF

Headlight 
washer 
switch

16

H/L WASHER 
SW

Headlight washer switch: ON

ON

Headlight washer switch: OFF

OFF

Headlight 
switch

00

HEADLIGHT 
SW

Lighting switch: HEAD

ON

Lighting switch: Other than HEAD

OFF

Windshield 
high-speed 
wiper switch

07

HI WIPER SW

Wiper switch: HI

ON

Wiper switch: Other than HI

OFF

With or 
without 
windshield 
intermittent 
wiper interval 
adjusting 
knob

15

INT WIPE 
KNOB

Vehicles with intermittent wiper adjusting 
knob

EQUIP

Vehicles without intermittent wiper adjusting 
knob

NON

Windshield 
intermittent 
wiper switch

05

INT WIPER SW Wiper switch: INT

ON

Wiper switch: Other than INT

OFF

Windshield 
low-speed 
wiper switch

06

LO WIPER SW Wiper switch: LO

ON

Wiper switch: Other than LO

OFF

Windshield 
mist wiper 
switch

08

MIST WIPER 
SW

Wiper switch: Mist

ON

Wiper switch: Other than "Mist" position

OFF

Passing light 
switch

03

PASSING SW

Passing light switch: ON

ON

Passing light switch: OFF

OFF

Tail light 
switch

01

TAILLIGHT SW Lighting switch: TAIL

ON

Lighting switch: OFF

OFF

Turn-signal 
light switch 
(LH)

11

T/S LH SW

Turn-signal light switch: LH

ON

Turn-signal light switch: Other than LH

OFF

Turn-signal 
light switch: 
RH

10

T/S RH SW

Turn-signal light switch: RH

ON

Turn-signal light switch: Other than RH

OFF

Rear wiper 
switch

13

REAR WIPER 
SW

Rear wiper switch: INT

ON

Rear wiper switch: Other than INT

OFF

Rear washer 
switch

14

REAR 
WASH.SW

Rear wiper switch: Washer

ON

Rear wiper switch: Other than "Washer" 
position

OFF

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-11

• ETACS ECU

CHECK 
ITEM

ITEM 
NO.

DISPLAY ON 
SCAN TOOL

CHECK CONDITION

NORMAL 
CONDITION

BEEP DATA 60

beep data

1. Ignition switch: ACC or ON
2. Carry out the audio preset operation.

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

Other than the condition above

OFF

Tone alarm

43

BUZZER

1. Ignition switch: LOCK (OFF)
2. Key reminder switch: ON
3. Front door switch: ON (front door open)

ON

When requirements for sounding each 
warning tone alarm are not satisfied

OFF

Front door 
switch

32

FRONT DOOR 
SW

Front door switch (right or left): right or left 
door switch is on (right or left front door is 
open)

ON

Front door switches (right and left): both 
right and left door switches are off (both 
right and left front doors are closed)

OFF

Center 
display input 
signal

62

DISPLAY 
SIGNAL

1. Ignition switch: ACC or ON
2. Carry out the audio preset operation.

YES (only 
momentarily when 
switch is operated)

Other than the condition above

NO

Center 
display sleep 
status

61

DISPLAY 
SLEEP

Ignition switch: LOCK (OFF)

SLEEPING

Ignition switch: ACC or ON

OPERATING

Front door 
switch

32

FRONT DOOR 
SW

Front door switch (right or left): right front 
door or left front door switch is on (right or 
left front door is open):

ON

Front door switch (right or left): Both right 
and left door switches are off (both right and 
left front doors are closed)

OFF

Front fog 
lights

36

F.FOG LIGHT

1. Lighting switch: HEAD or TAIL
2. Fog light switch: ON

ON

Other than the condition above

OFF

Headlight 
automatic 
shutdown 
function

35

H/L AUTO-CUT 1. Lighting switch: Other than OFF

2. Ignition switch: from ON or START to 

LOCK (OFF) or ACC

3. Front door switch: ON (front door open)

OFF to ON (after 
approximately one 
second)

When requirements for the headlight 
automatic shutdown are not satisfied

OFF

Ignition 
switch (IG1)

30

IG SW (IG1)

Ignition switch: ON or START

ON

Ignition switch: LOCK (OFF) or ACC

OFF

Ignition 
switch (ACC)

31

IG SW (ACC)

Ignition switch: ACC or ON

ON

Ignition switch: LOCK (OFF) or START

OFF

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54Ba-12

NOTE: For item number 43, the scan tool also dis-
play "ON" when the light reminder tone alarm or R 
(reverse) position warning tone alarm is triggered.

• FRONT ECU

NOTE: For item number 70, the scan tool also dis-
plays "NG" under the "ECU COMM CHK" when it dis-
plays "NO ACK" under the front-ECU check.

• SUNROOF ECU (sunroof motor assembly)

NOTE: For item number 72, the scan tool also dis-
plays "NG" under the "ECU COMM CHK" when it dis-
plays "No response" under the sunroof-ECU check.

Transmission 
range switch 
("R" position)

41

INHIBITOR SW Transmission range switch: R position

ON

Transmission range switch: Other than R 
position

OFF

Windshield 
intermittent 
wiper interval

37

INT WIPE 
TIME

1. Ignition switch: ACC or ON
2. Operate the intermittent wiper adjusting 

knob, and change the wiper interval

The scan tool 
displays 
intermittent wiper 
interval in 
response to the 
intermittent wiper 
adjusting knob 
positions

Theft-alarm 
headlights

45

THEFTALM. H/
L

Keyless entry transmitter panic button: ON

ON

Keyless entry transmitter panic button: OFF OFF

CHECK 
ITEM

ITEM 
NO.

DISPLAY ON 
SCAN TOOL

CHECK CONDITION

NORMAL 
CONDITION

CHECK 
ITEM

ITEM 
NO.

DISPLAY ON 
SCAN TOOL

CHECK CONDITION

NORMAL 
CONDITION

Response by 
the front-
ECU

70

FRONT ECU 
ACK

Lighting switch is at position other than OFF 
(excluding when high-beam is on) or the 
wiper switch is at position other than OFF

NORMAL ACK

• Ignition switch: ON or START

• Lighting switch: OFF

• Wiper switch: OFF

SLEEP ACK

• Lighting switch: HEAD

• Headlight: High-beam

HI-BEAM ACK

Except above conditions

NO ACK

CHECK 
ITEM

ITEM 
NO.

DISPLAY ON 
SCAN TOOL

CHECK CONDITION

NORMAL 
CONDITION

Response by 
the sunroof-
ECU

72

S/R ECU ACK

1. Ignition switch: ON or START
2. While sunroof is off

NORMAL ACK 

→ 

SLEEP ACK (after 
approximately 30 
seconds)

1. Ignition switch: ON or START
2. One of the sunroof switches is on

INPUT CHECK 

→ 

NORMAL ACK

Except above conditions

NO ACK