Mitsubishi Montero Sport (2004+). Manual — part 534

HEADLIGHT

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CHASSIS ELECTRICAL

54-123

HEADLIGHT

INSPECTION

M1543019501567

AMBIENT TEMPERATURE SENSOR CHECK

Check the internal resistance of the ambient temperature sen-
sor are at the standard values at temperature of 20

°C (68°F)

and 40

°C (104°F).

Standard value:
Approximately 1,200

Ω [at 20°C (68°F)]

Approximately 500

Ω [at 40°C (104°F)]

LIGHTING SYSTEM DIAGNOSIS

INTRODUCTION TO LIGHT REMINDER ALARM DIAGNOSIS

M1542010500490

A ETACS-ECU is mounted in all vehicles.
ETACS-ECU has a light reminder tone alarm func-
tion. The light reminder tone alarm function alerts the
driver that the lights have not been turned off. If the
following symptoms occur, the system may be mal-
functioning.

• When the tone alarm does not stop sounding

when the ignition key is turned to the "ON" posi-
tion.

• When the tone alarm does not stop sounding

when the lighting switch is turned "OFF."

• When the tone alarm does not stop sounding

when the driver's door is closed.

• When the tone alarm does not sound when the

ignition key is inserted ("OFF" position), the light-
ing switch is turned to the "ON" position (HEAD"
or "TAIL" position), and the river's door is opened.

LIGHT REMINDER ALARM DIAGNOSIS TROUBLESHOOTING STRATEGY

M1542010600118

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
light reminder alarm 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. Confirm that the malfunction is eliminated.

SYMPTOM CHART

M1542009100197

AC002772

AB

SENSOR

DRYER

THERMOMETER

SYMPTOM

INSPECTION
PROCEDURE

REFERENCE PAGE

Light reminder tone alarm function does not work normally.

1

P.54-124

Day time running light function does not illuminate <Vehicles for
Canada>.

2

P.54-139

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CHASSIS ELECTRICAL

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SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: Light Reminder Tone Alarm Function does not Work Normally.

FUSIBLE
LINK

8

FUSIBLE
LINK

RELAY
BOX

RELAY
BOX

JUNCTION
BLOCK

ETACS-
ECU

TONE
ALARM

KEY
REMINDER
SWITCH

FRONT
DOOR
SWITCH
(LH)

IOD OR
STORAGE
CONNECTOR

IGNITION
SWITCH (IG1)

WHEN KEY
IS REMOVED

COLUMN
SWITCH

LIGHTING
SWITCH

11

JOINT
CONNECTOR (3)

Light Reminder Tone Alarm Circuit

HEADLIGHT

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CHASSIS ELECTRICAL

54-125

.

AC003431

CONNECTOR: A-54X

A-54X

AC

AC003478

AC

CONNECTOR: C-70

C-70

AC003622

CONNECTOR: C-72

AD

C-72 (B)

AC003476 AC

CONNECTOR: D-01

JUNCTION BLOCK (FRONT)

D-01

AC003479

AC

CONNECTORS: D-08, D-11, D-13, D-14

D-08

D-11

JUNCTION BLOCK (REAR)

D-13

D-14 (B)

AC003477AB

CONNECTORS: D-16, D-24

D-16

D-24

AC003480

AB

CONNECTORS: E-33, E-42

E-33

E-42

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CHASSIS ELECTRICAL

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CIRCUIT OPERATION

• The ETACS-ECU judges the state of the ignition

switch by detecting voltage from the ignition
switch.

• The ETACS-ECU judges whether the driver's

side door is opened or closed by defecting the
front door switch (LH) signal.

• The ETACS-ECU judges whether the ignition

switch in inserted or removed by defecting the
key reminder switch signal.

• The ETACS-ECU judges the state of the column

switch (lighting switch) by defecting voltage from
the column switch (lighting switch).

• When the river's door is opened (door switch on)

with the lighting switch in the on ("TAIL" or
"HEAD") position, the tone alarm will sound con-
tinuously to remind the driver that the lights (tail-
lights or headlights) are on.

.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably an abnormal signal from the
lighting switch or a defective driver's side door
switch.

.

TROUBLESHOOTING HINTS

• Malfunction of the driver's side door switch

• Damaged harness or connector

• Malfunction of the ETACS-ECU

.

DIAGNOSIS

Required Special Tools:

• MB991223: Test Harness Set

• 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 (Vehicles without

CAN communication system)

• MB991529: Diagnostic Trouble Code Check Harness