Mitsubishi Montero (2002-2004). Manual - part 477

DOME LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-79

DOME LIGHT

DOME LIGHT DIAGNOSIS

M1542010500263

The dome light is controlled by the Simplified Wiring 
System (SWS). For troubleshooting, refer to GROUP 
54B, SWS Diagnosis 

− Symptom Chart 

P.54Bb-2

. 

HIGH-MOUNTED STOPLIGHT

REMOVAL AND INSTALLATION

M1542005100151

ACX00801AB

3

2

1

4

REMOVAL STEPS

1.

HIGH-MOUNTED STOPLIGHT 
COVER

2.

HIGH-MOUNTED STOPLIGHT 
BODY

3.

SOCKET ASSEMBLY

4.

BULB

REMOVAL STEPS (Continued)

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-80

SIDE STEP LIGHT

GENERAL DESCRIPTION CONCERNING THE SIDE STEP LIGHT

M1542013000018

.

SIDE STEP LIGHT TIMER FUNCTION
The side step light-ECU controls the side step lights 
as follows when the ignition switch is at "LOCK" 
(OFF) position and all the doors are closed:

• If the side step light-ECU receives door unlock 

signal from the unlock relay, the side step lights 
fade in over a 0.6 second period, and then illumi-
nate for 13.2 seconds at maximum brightness. 
Then the lights will fade out over a 1.2 second 
period.

• If the side step light-ECU receives lock signal 

from the lock relay, the side step lights fade out 
over a 1.2 second period.

• If a door is opened, the side step lights fade in 

over a 0.6 second period, and then illuminate for 
148.2 seconds at maximum brightness. Then the 
lights will fade out over a 1.2 second period.

The side step light-ECU controls the side step lights 
as follows when the ignition switch is at "LOCK" 
(OFF) position and any door is open:

• The side step lights do not go out until a predeter-

mined period elapses even if the doors are 
locked.

• The side step lights do not illuminate even if the 

doors are unlocked.

• When the doors are closed while the side step 

lights are on, the lights illuminate for 28.8 sec-
onds at maximum brightness immediately after 
that and then fade out.

• If all the doors are closed with the side step lights 

on and then any door is opened before the lights 
go out, the lights illuminate for 148.2 seconds at 
maximum brightness immediately after that, and 
then fade out.

If the ignition switch is turned from "LOCK" (OFF) to 
"ON" with the side step lights on, the side step light-
ECU makes the side step lights fade out.

SIDE STEP LIGHT DIAGNOSIS

INTRODUCTION

M1542010500564

The side step light system consists of the side step 
light assembly, side step light-ECU, ETACS-ECU 
and all door switches. If the side step light does not 

illuminate, one of these components may be defec-
tive.

AC203828

ON

OFF

ON (Door opened)

OFF (Door closed)

ON

OFF

Ignition switch (IG1)

<SAMPLE TIMING CHART>

Door switch

Side step light output

t1

t2 t3

t1:     0.6 second
t2:   13.2 seconds
t3:     1.2 seconds
t4: 148.2 seconds
t5:   28.8 seconds

Lock relay output

OFF

ON

Unlock relay output

OFF

ON

t4

t1

not 
more 
than t2

t3

t1

t3

t3

t1

t3

t1

not 
more 
than t4

t5

not 
more 
than t4

AB

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-81

TROUBLESHOOTING STRATEGY

M1542010600141

Use these steps to plan your diagnostic strategy. If 
you follow them carefully, you will be sure that you 
have exhausted most of the possible ways to find a 
side step light fault.
1. Gather information from the customer.

2. Verify that the condition described by the 

customer exists.

3. Find the malfunction by following the symptom 

chart.

4. Verify the malfunction is eliminated.

SYMPTOM CHART

M1542009100227

SYMPTOM

INSPECTION 
PROCEDURE

REFERENCE PAGE

The side step light do not illuminate.

1

P.54A-82

The left or right side step light do not illuminate.

2

P.54A-89

The side step light do not illuminate normally when the door is 
unlocked or locked.

3

P.54A-97

The side step light do not illuminate normally when any door is 
opened or closed.

4

P.54A-103

SIDE STEP LIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-82

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: The Side Step Lights do not Illuminate.

Side Step Light-ECU Circuit

ACX02274

FUSIBLE LINK (1)

AE

BATTERY

AC204170

CONNECTORS : D-28, D-137

D-28

AV

D-137(GR)