Mitsubishi Montero (2002-2004). Manual — part 350

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-447

INTERIOR LIGHT

GENERAL DESCRIPTION CONCERNING INTERIOR LIGHT

M1549021800065

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.

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.

FUNCTION

CONTROL ECU

Dome light control function

ETACS-ECU

Ignition key hole illumination light function

ETACS-ECU

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

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-448

General circuit diagram for interior lights

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-449

SYMPTOM PROCEDURES

TSB Revision

SWS SYMPTOM PROCEDURES

54Bb-450

INSPECTION PROCEDURE M-1: Interior Light: The dome light do not illuminate or go out normally.

NOTE: This troubleshooting procedure requires the
use of scan tool MB991502 and SWS monitor kit
MB991862. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor

P.54Ba-8

."

Interior Light Circuit

ACX02274

FUSIBLE LINK (1)

AE

BATTERY

AC204170

CONNECTORS : D-26, D-28

BP

D-28

D-26