Mitsubishi Montero (2004+). Manual — part 792

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-425

STEP 23. Check the wiring harness between joint
connector (2) A-15 (terminal 1) and relay box (fuse No. 20).
Q: Is the wiring harness between joint connector (2) A-15

(terminal 1) and relay box (fuse No. 20) in good
condition?
YES : No action is necessary and testing is complete.
NO : The wiring harness may be damaged or the

connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the fog lights illuminate normally.

INTERIOR LIGHT

GENERAL DESCRIPTION CONCERNING INTERIOR LIGHT

M1549021800140

The ECU related to the interior light function types
and various control functions are as follows.

Dome light control function
When the dome light switch is at the door position,
the ETACS-ECU controls the lighting of the dome
light as follows:

• When a door is opened to get on or get off the

vehicle with the ignition switch off, the dome light
lights up at a luminance of 100 percent. When a
door is closed, the dome light dims at a lumi-
nance of 65 percent, and goes off 30 seconds
later. However if the ignition switch is turned ON
or if all doors are locked while they are closed,
the dome light will go off at that point.

• When a door is opened with the ignition switch

ON, the dome light lights up at a luminance of
100 percent. When a door is closed, the dome
light goes off.

• When the ignition key is removed with all doors

closed, the dome light lights up at a luminance of
100 percent, and goes off 30 seconds later. How-
ever if the ignition key is inserted again or if all
doors are locked while the dome light is lighting,
the dome light will go off at that point.

• The dome light is flashed twice when door is

locked with keyless entry. When door is unlocked
with keyless entry, the dome light lights at a lumi-
nance of 100 percent, and goes off 15 seconds
later.

AC204167

CONNECTOR : A-15

AD

14

13

4

1112

5

3

10

8 9

2

7

1

6

FUNCTION

CONTROL ECU

Dome light control function

ETACS-ECU

Ignition key hole illumination light function

ETACS-ECU

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-426

NOTE: The dotted lines indicate that lighting mode when the ignition switch is turned ON, all doors are locked
during the timer illumination time.

Ignition key hole illumination light function
The ignition key cylinder illumination light illuminates
when the driver's door is opened with the ignition
switch off, and for thirty seconds after the driver's
door is closed. It also illuminates for thirty seconds
after the ignition key is pulled out. In any case, it
goes out when the ignition switch is turned on.

AC101555AC

t: 30 seconds

ON

ON (Any door is open)

LOCK

LOCK (OFF)

OFF (All doors are closed)

OFF

Ignition switch

Door switch

Keyless entry system
door lock or unlock signal

t

t

t

ACC

Key removed

UNLOCK

100%

65%

0%

Dome light intensity

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

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General circuit diagram for interior lights

ETACS-
ECU

JUNCTION BLOCK

FRONT DOOR
SWITCH

(LH)

FRONT DOOR
SWITCH

(RH)

REAR DOOR
SWITCH

(LH)

REAR DOOR
SWITCH

(RH)

REAR
PERSONAL
LIGHT

(LH) (RH)

CARGO
SPACE
LIGHT

DOME
LIGHT

BACK DOOR
SWITCH

KEY
REMINDER
SWITCH

IGNITION
SWITCH (IG1)

RELAY BOX
(FUSE )

18

DATA LINK
CONNECTOR

DATA LINK
CONNECTOR

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-428

INSPECTION PROCEDURE M-1: Interior Light: The dome light, cargo space light and/or rear personal
lights do not illuminate or go out normally.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54B-10

."