Mitsubishi Montero Sport (2004+). Manual - part 506

IGNITION SWITCH

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CHASSIS ELECTRICAL

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SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1: When the Driver's Side Door is Opened, the Ignition Key Hole Illumination Light
does not Illuminate.

FUSIBLE
LINK

RELAY
BOX

JUNCTION BLOCK

ETACS-
ECU

TONE
ALARM

KEY
REMINDER
SWITCH

FRONT
DOOR
SWITCH
(LH)

IGNITION KEY HOLE
ILLUMINATION
LIGHT

IOD OR
STORAGE
CONNECTOR

IGNITION
SWITCH (IG1)

WHEN KEY
IS REMOVED

Ignition Key Hole Illumination Circuit

IGNITION SWITCH

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CIRCUIT OPERATION

• The ETACS-ECU monitors the ignition switch by

detecting voltage from the ignition switch.

• The ETACS-ECU judges that the driver's side

door is opened or closed by detecting voltage
from the front door switch (LH).

• When the driver's door is opened (door switch

on), the ignition key hole illumination light will illu-
minate. When the driver's door is closed (door
switch off), the ignition key hole illumination light
will go out within 15 seconds.

AC003431

CONNECTOR: A-54X

A-54X

AC003434

CONNECTOR: C-11

C-11

AC003622

CONNECTOR: C-72

C-72 (B)

AC003432AB

CONNECTOR: D-01

JUNCTION BLOCK

(FRONT)

D-01

AC003435AD

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

D-13

D-14(B)

D-08

D-11

JUNCTION BLOCK(REAR)

AC003433

CONNECTOR: D-16

D-16

AC003436 AB

CONNECTORS: E-35, E-42

E-42

E-33

IGNITION SWITCH

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CHASSIS ELECTRICAL

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TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a malfunction in the key hole
illumination light circuit system or input signal from
the driver's side door switch.

TROUBLESHOOTING HINTS

• Malfunction of the driver's side door switch

• Malfunction of the key hole illumination light

• Damaged harness wire or connector

• Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

• MB991529: Diagnostic Trouble Code Check Harness

• 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)

STEP 1. Check the input signal (by using pulse check).

Check the ETACS-ECU input signal (driver’s side door) by
using scan tool MB991958.

CAUTION

To prevent damage to scan tool MB991958, always turn the
ignition switch to "LOCK" (OFF) position before connect-
ing or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Check that the tone alarm of scan tool MB991958 sounds

when the driver's side door is opened.

Q: Does the tone alarm of scan tool MB991958 sound when

the input signal enters?
YES : Replace the ETACS-ECU. Check that the malfunction

is eliminated.

NO : Go to Step 3.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

IGNITION SWITCH

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STEP 2. Check the input signal from the driver's side door
switch (by using a voltmeter).

Check the input signals from the following switches:
(1) Use special tool MB991529 to connect a voltmeter between

ground terminal 4 or 5 and ETACS-ECU terminal 9 of the
data link connector.

(2) Check that the voltmeter indicator deflects once when the

input signal enters.

Q: Does the voltmeter indicator deflect?

YES : Replace the ETACS-ECU. Check that the malfunction

is eliminated.

NO : Go to Step 3.

STEP 3. Check the driver's side door switch.

Remove the driver's side door switch. Refer to GROUP 42,
Door

P.42-132

Q: Is the driver's side door switch in good condition?

YES : Go to Step 4.
NO : Replace it. Check that the malfunction is eliminated.

STEP 4. Check the driver's side door switch ground circuit

Measure the resistance between the driver's side door switch
body (metal section) and ground.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with

this range?
YES : Go to Step 5.
NO : Repair the harness wire or connector. Then go to Step

AC003527

GROUNDED TERMINAL

ETACS-ECU
TERMINAL

MB991529

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

Released (ON)

− 2, 1 − 3, 2 − 3 Less than 2 ohms

Depressed (OFF) 1

− 2, 1 − 3, 2 − 3 Open circuit

AC002733 AB

AC002734

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