Mitsubishi Montero (2004+). Manual - part 687

GENERAL DESCRIPTION

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-5

SEAT BELT WARNING LIGHT

If any of the following conditions is met with the igni-
tion switch at "ON" or "ST", the ETACS-ECU illumi-
nates the indicator light by using the driver's seat belt 
switch signal.

• The ETACS-ECU illuminates the indicator light 

for six seconds if the ignition switch is turned 
"ON" while the seat belt switch is on (the driver's 
seat belt is not fastened).

• The ETACS-ECU flashes the indicator light 12 

cycles (after 0.5 seconds) if the seat belt switch is 
on (driver's seat belt is not fastened) when sixty 
seconds or more have elapsed since the ignition 
switch is turned "ON". One cycle consists of 
five-second "on" and then three-second "off".

NOTE: The ETACS-ECU stops flashing the indicator 
light immediately when the seat belt witch is off 
(driver's seat belt is fastened) or the ignition switch is 
turned to the "OFF" or "ACC" position while the seat 
belt tone alarm function is working.

HEADLIGHT

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Headlight automatic shutdown function
When the headlights or taillights are on, and the igni-
tion switch is turned from "ON" to "LOCK" (OFF) or 
"ACC" position or the ignition key is removed, the 
headlights will be switched off in three minutes. If the 
driver's door is opened within that three-minute 
period, the headlights will be switched off automati-
cally. This prevents the battery from discharging.
NOTE: The headlight automatic shutdown function 
can be disabled by the SWS configuration function. 
Refer to 

P.54B-635

.

.

Headlight dimmer switch automatic resetting 
function
This function allows the dimmer switch to be reset to 
the low-beam position whenever the headlight switch 
is turned to the ON position.

FLASHER TIMER

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Turn-signal light
When the ignition switch is turned to the "ON" posi-
tion and turn-signal light switch is placed in the ON 
position for right or left turn-signaling, the system 
generates turn-signal light drive signals (flashing sig-
nals). The system also notifies of a blown turn-signal 
light bulb by shortening the flashing intervals of the 
corresponding indicator light.

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Hazard warning light
The system detects a change from OFF to ON of the 
hazard warning input signal and activates or shuts off 
the hazard warning lights accordingly.

FOG LIGHT

The fog light switch becomes active only when the 
headlights are at the low-beam mode. Therefore, if 
the headlights are turned off, the fog lights will also 
be switched off. When the headlights are turned on 
during the next key cycle, the fog lights will be off 
regardless of the fog light switch position.

DOME LIGHT

With the dome light switch in the "door controlled 
operation" (middle) position, the ETACS-ECU con-
trols the dome light operation as follows:

• When a door is opened from outside or inside 

[with the ignition switch turned to "LOCK" (OFF)]: 
When a door is opened, the ETACS-ECU causes 
the dome light to be illuminated at 100% intensity. 
When the door is closed, it dims the dome light to 
65% intensity and approximately 30 seconds 
later, turns out the light completely. During this 
period (timer controlled period), the dome light 
goes out if the ignition switch is turned "ON" or 
the doors are locked.

• When a door is opened or closed with the ignition 

switch in the "ON" position: The dome light illumi-
nates at 100% intensity when a door is opened 
and turned out when it is closed.

• When no door is opened and the ignition key is 

removed: The dome light is illuminated at 100% 
intensity and turned off approximately 30 sec-
onds later. During that time (timer-controlled 
period), the dome light goes out if the ignition key 
is inserted and turned to "ON" or the door locking 
system is activated.

• Dome light's answerback operation in response 

to door lock control by keyless entry system: To 
allow the driver to confirm the doors have locked 
by the keyless entry system, the ETACS-ECU 
causes the dome light to blink twice when the 
doors are locked by the RKE system and to illu-
minate for approximately 15 seconds when the 
doors are locked. The dome light's answerback 
operation in response to a keyless entry system 
control action is accompanied by flashing of the 
hazard warning lights.

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-6

THEFT-ALARM SYSTEM

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Theft-alarm System Operation
If a door, back door or hood is opened, when the 
theft-alarm system has been armed the horn 
(theft-alarm horn and horn) will sound and headlights 
flash (high-beam) intermittently for a period of 180 
seconds.

.

Panic Alarm Function
With the theft-alarm function armed, pressing the 
panic button on the keyless entry system transmitter 
causes the horn (theft-alarm horn and horn) to sound 
for about 180 seconds in an attempt to prevent theft. 
The alarm is turned off by pressing any switch on the 
transmitter.

CONFIGURATION FUNCTION

The keyless entry hazard answerback function and 
the headlight automatic shutdown function can be 
adjusted by the special operation. Or they can be 
returned to the initial condition.

SWS DIAGNOSIS

GENERAL DESCRIPTION

BEFORE CARRYING OUT TROUBLESHOOTING

M1549014700204

Before carrying out troubleshooting, check the fol-
lowing two items.

• Make sure that the ETACS-ECU, the junction 

block (J/B), the front-ECU and the engine com-
partment relay box are connected securely.

• Make sure that fuses and fusible links related to 

relevant systems are not blown.

SWS DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1549000500638

1. Gather information about the problem from the 

customer.

2. Verify that the condition described by the 

customer exists.
NOTE: If an error occurs in the SWS communica-
tion line, the ECU isolated from the communica-
tion line performs a fail-safe or backup operation, 
so the problem may not match the one shown in 
the Trouble Symptom Chart. However, the cause 
of the failure can be tracked down by performing 
the following troubleshooting with the SWS moni-
tor.

3. Version number and destination check

Check whether the SWS version number (0) and 
destination (North America) meet the vehicle 
specifications. If they are different, replace the 
ETACS-ECU with a correct one.

4. Use scan tool to select "ECU COMM CHK" on the 

SWS monitor display.
Check whether the communication status of the 
input- or output-signal-side ECU associated with 
the defective function is normal.

• If "OK" is displayed for all related ECUs, they 

communicate with each other normally and the 
input or output signal circuit system may be 
defective. Therefore, check SWS monitor service 
data.

• If "NG" is displayed for any of the related ECUs, 

something may be wrong with the ECU for which 
"NG" appears, its power supply or grounding sys-
tem, or a wiring harness or connector between 
the SWS monitor and the ECU. Check the wiring 
harness and connectors associated with the ECU 
and examine the ECU itself.

5. Service data on the SWS monitor

Select the defective function from the 
function-specific diagnostic menu, and check the 
service data that appears for each function item.
NOTE: In addition to the function-specific diag-
nostic menu, a service data menu is available for 
SWS monitor service data to check all items for 
each ECU.
(1) When the SWS communication line is 

monitored.

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-7

(2) You can determine whether the problem lies in 

the input or output signal circuit system by 
checking whether communication data is 
correct.

• The switch condition does not meet the service 

data display: Input signal system related to defec-
tive functions

• The switch condition meets the service data dis-

play: Output signal system related to defective 
functions

6. Check of input signal circuit system

Check relevant switch, sensor, input signal-side 
ECU and their wiring harness and connector.

7. Check of output signal circuit system

Check an output signal-side ECU, electrical load 
components and their wiring harness and 
connector.

HOW TO CONNECT SWS MONITOR

M1549014800494

Required Special Tools:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991911: MUT-III Main Harness B

• MB991813: SWS Monitor Kit

• MB991806: SWS Monitor Cartridge

• MB991812: SWS Monitor Harness (For Column-ECU)

• MB991822: Probe Harness

• MB991863: SWS Monitor Harness (For 13-pin)

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Connect 
the main harness B MB991911 before connecting the SWS 
monitor harness (for 13-pin) MB991862 or the SWS moni-
tor harness (for column-ECU) MB991812. Be sure to con-
nect SWS monitor cartridge MB991806 after turning on the 
V.C.I. MB991924.

.

SWS DIAGNOSIS

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-8

SWS communication line connecting method <SWS 
monitor harness (for 13-pin)>
1. Ensure that the ignition switch is at the "LOCK" (OFF) 

position.

2. Start up the personal computer.
3. Connect special tool MB991827 to special tool MB991824 

and the personal computer.

4. Connect special tool MB991911 to special tool MB991824.
5. Connect special tool MB991911 to the data link connector 

(16-pin).

6. Connect special tool MB991812 to data link connector 

(13-pin).

7. Connect special tool MB991862 to special tool MB991806.
8. Connect special tool MB991806 to special tool MB991824.
9. Turn the power switch of special tool MB991824 to the "ON" 

position.
NOTE: When special tool MB991824 is energized, special 
tool MB991824 indicator light will be illuminated in a green 
color.

10.Start the MUT-III system on the personal computer.

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AC309091

MB991911

MB991827

MB991824 

AB

MB991806

MB991862

DATA LINK
CONNECTOR 
(16-PIN)

DATA LINK
CONNECTOR 
(13-PIN)

AC208681

MB991806

AD

MB991862

MB991824

MB991911

MB991827