Mitsubishi Montero Sport (2004+). Manual - part 510

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-27

STEP 3. Check the ignition switch circuit.

(1) Disconnect ETACS-ECU connector D-11 and measure at 

the junction block side.

(2) Turn the ignition switch to "ON" position.

(3) Measure the voltage between terminal number 3 and 

ground.

Q: Is the battery positive voltage (approximately 12 volts) 

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

is eliminated.

NO :  Go to Step 4.

STEP 4. Check ETACS-ECU connector D-11 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is ETACS-ECU connector D-11 in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. 

AC201084

JUNCTION 
BLOCK (REAR)

D-11

COMPONENT SIDE

AB

CONNECTOR: D-11

AC002729AB

CONNECTOR D-11
(JUNCTION BLOCK SIDE)

AC201084

JUNCTION 
BLOCK (REAR)

D-11

COMPONENT SIDE

AB

CONNECTOR: D-11

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-28

STEP 5. Check the harness wires between the ignition 
switch (IG1) and ETACS-ECU connector D-11 (terminal 
No.3).

NOTE: After inspecting junction block D-08, inspect the wire. If 
junction block D-08 is damaged, repair or replace it. Refer to 
GROUP 00E, Harness Connector Inspection 

P.00E-2

.

Q: Are the harness wires between the ignition switch (IG1) 

and ETACS-ECU connector D-11 (terminal No.3) 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. 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.

AC201941

M

3

1

4

2

CONNECTORS: D-08, D-11

AB

D-08 COMPONENT SIDE

D-11 COMPONENT SIDE

D-08

D-11

JUNCTION BLOCK (FRONT)

IGNITION SWITCH

TSB Revision

CHASSIS ELECTRICAL

54-29

INSPECTION PROCEDURE 4: The Ignition Key Reminder Tone Alarm does not Stop Sounding by 
Removing the Ignition Key. (The Tone Alarm Stops Sounding by Closing the Driver's Door.)

.

CIRCUIT OPERATION
Refer to Inspection Procedure 1 for circuit operation 

P.54-11

.

.

TECHNICAL DESCRIPTION (COMMENT)
It is possible that there is a malfunction of the input 
signal from the key reminder switch or the 
ETACS-ECU.

.

TROUBLESHOOTING HINTS

• Damaged harness wire or connector

• Malfunction of the ETACS-ECU

• Malfunction of the key reminder switch

.

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 (ignition switch position) 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 ignition key is moved from the "LOCK" (OFF) 
position to the "ON" position.

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

TSB Revision

CHASSIS ELECTRICAL

54-30

STEP 2. Check the input signal from the ignition 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 

ignition key is moved from the "LOCK" position to the "ON" 
position.

Q: Does the voltmeter indicator deflect?

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

is eliminated.

NO :  Go to Step 3.

STEP 3. Measure the continuity of the key reminder switch.

(1) Remove the driver's side under cover (Refer to 

P.52A-37

).

(2) Remove the column covers, lower and upper (Refer to 

P.52A-37

).

(3) Disconnect wiring connector D-16 from the key reminder 

switch and measure at the key reminder switch side.

(4) Measure the resistance between terminal numbers 4 and 6.

Q: Does the measured resistance value correspond with 

this range?
YES : Go to Step 4.
NO :  Replace the key reminder switch. Then check that the 

malfunction is eliminated.

STEP 4. Check the input signal from the key reminder 
switch.

Check that the tone alarm stops sounding when terminal num-
ber 6 is grounded.
Q: Does the tone alarm stop sounding?

YES : Go to Step 5.
NO :  Go to Step 7.

AC003527

GROUNDED TERMINAL

ETACS-ECU 
TERMINAL

MB991529

AB

STATUS OF 
IGNITION KEY

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Removed

4 

− 6

Less than 2 ohms

Inserted

4 

− 6

Open circuit

AC002730

AC002731AB

CONNECTOR D-16
(HARNESS SIDE)