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