Mitsubishi Montero Sport (2004+). Manual — part 508

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-19

NOTE: After inspecting IOD storage connector A-54X, inspect
the wire. If IOD storage connector A-54X is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector Inspec-
tion

P.00E-2

.

Q: Are the harness wires between fusible link number 8

and key reminder switch connector D-16 (terminal No.1)
in good condition?
YES : Go to Step 12.
NO : Repair or replace them. Then check that the

malfunction is eliminated.

STEP 12. Check the harness wires between key reminder
switch connector D-16 (terminal No.2 and 6) and

ETACS-ECU connector D-11 (terminal No.8 and 12).

AC200774

2

1

CONNECTOR: A-54X

AB

A-54X

AC202060

4

5

3

1

6

7

2

1

2

4

5

3

6

8

9

7

10

11

13

14

12

16

17

201918

15

AC201086

IGNITION SWITCH

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CHASSIS ELECTRICAL

54-20

NOTE: After inspecting intermediate connector C-72, junction
block D-13, inspect the wire. If intermediate connector C-72,
junction block D-13 are damaged, repair or replace them. Refer
to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Q: Are the harness wires between key reminder switch

connector D-16 (terminal No.2 and 6) and ETACS-ECU
connector D-11 (terminal No.8 and12) in good
condition?
YES : Replace the ETAS-ECU.
NO : Go to step 13.

STEP 13. Check for continuity between terminals (except
terminal No. 4 and No. 6) of key reminder switch connector
D-16.

(1) Measure at key reminder switch connector D-16 without

disconnecting the connector.

(2) Check that there is no continuity between key reminder

switch terminal No. 4 and each terminal (except terminal
No. 6), as well as between key reminder switch terminal
No.6 and each terminal (except terminal No. 4).

Q: Does continuity exist between terminals?

YES : Replace the key reminder switch. If the functions,

which are described in "CIRCUIT OPERATION", work
normally, the input signal from the key reminder
switch should be normal.

NO : Go to Step 14.

STEP 14. Recheck for malfunction.
Q: Is a malfunction eliminated?

YES : This procedure is complete. (If no malfunctions are

found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Point

− How to

Cope with Intermittent Malfunction

P.00-7

.)

NO : Go to Step 1.

8

19

7

6

5

16

15

17 18

4

3

2

10 11 12 13

1
9

14

AC201910

CONNECTOR: C-72

AB

C-72 (B)

AC202060

4

5

3

1

6

7

2

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-21

INSPECTION PROCEDURE 2: The Ignition Key Hole Illumination Light does not Go Out.

.

CIRCUIT OPERATION
Refer to Inspection Procedure 1

P.54-11

.

.

TECHNICAL DESCRIPTION (COMMENT)
The cause is probably a short circuit n the harness or
a defective ETACS-ECU.

.

TROUBLESHOOTING HINTS

• 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 switch)
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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CHASSIS ELECTRICAL

54-22

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.

AC003527

GROUNDED TERMINAL

ETACS-ECU
TERMINAL

MB991529

AB

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

Released (ON)

1

− 2, 1 − 3, 2 − 3 Less than 2 ohms

Depressed (OFF) 1

− 2, 1 − 3, 2 − 3 Open circuit

AC002733 AB

1

2

3

AC002734