Mitsubishi Montero Sport (2004+). Manual - part 511

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-31

STEP 5. Check key reminder switch connector D-16 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.

Q: Is key reminder switch connector D-16 in good 

condition?
YES : Go to Step 6.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. 

STEP 6. Check the harness wire between key reminder 
switch connector D-16 and body ground.

Q: Is the harness wire between key reminder switch D-16 

(terminal No.4) and body ground damaged?
YES : There is no action to be taken.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. 

AC202060

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AC202060

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IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-32

STEP 7. Check the harness wire between key reminder 
switch connector D-16 (terminal No.2 and 6) and 
ETACS-ECU connector D-11 (terminal No.8 and 12).

NOTE: After checking intermediate connector C-72 and D-13, 
check the wires. If intermediate connector C-72 and D-13 are 
damaged, repair or replace them. Refer to GROUP 00E, Har-
ness Connector Inspection 

P.00E-2

.

Q: Is the harness wire between key reminder switch D-16 

(terminal No.2 and 6) and ETACS-ECU connector D-11 
(terminal No.8 and 12) in good condition?
YES : Go to Step 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. 

AC202060

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201918

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AC201086

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AC201910

CONNECTOR: C-72

AB

C-72 (B)

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-33

STEP 8. Check for continuity between terminals (except 
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 9.

STEP 9. Recheck for malfunction.
Q: Is a malfunction eliminated?

YES : The 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.

INSPECTION PROCEDURE 5: The Ignition Key Reminder Tone Alarm does not Sound when the 
Ignition Key is Inserted and the Driver's Door is Opened. (The Ignition Key is Turned to "OFF" 
Position.)

.

CIRCUIT OPERATION
Refer to Inspection Procedure 1 for the circuit opera-
tion 

P.54-11

.

.

TECHNICAL DESCRIPTION (COMMENT)
It is possible that there is a malfunction of the input 
signal from the door switch or the key reminder 
switch if the ignition key hole illumination light does 
not illuminate.

.

TROUBLESHOOTING HINTS

• Damaged harness wire or connector

• Malfunction of the ETACS-ECU

• Malfunction of the driver's side door switch

.

AC202060

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5

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IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-34

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.

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.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC003527

GROUNDED TERMINAL

ETACS-ECU 
TERMINAL

MB991529

AB