Mitsubishi Montero Sport (2004+). Manual - part 456

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NOTE: After inspecting intermediate connectors C-01 and E-18 
inspect the wire. If intermediate connectors C-01 or E-18 is 
damaged, repair or replace damaged component. Refer to 
GROUP 00E 

P.00E-2

, Harness Connector Inspection. Then go 

to Step 22.
Q: Are there any damaged harness wires between 

ETACS-ECU connectors D-10 (terminals No.21 and 
No.24) <Vehicles without keyless entry system> or D-27 
(terminals No.41 and No.42) <Vehicles with keyless 
entry system> and door lock actuator (liftgate) 
connector G-04 (terminals No.1 and No.2)?
YES : Replace the ETACS-ECU and then go to step 22.
NO :  Repair or replace the damaged components. Refer to 

GROUP 00E 

P.00E-2

, Harness Connector inspection. 

Then go to Step 22.

STEP 22. Retest the system.
Q: Does the door lock function operate normally?

YES : The procedure is complete.
NO :  Return to Step 1.

AC309309AC

C-01

CONNECTOR: C-01

AC309463

CONNECTOR: E-18

E-18

AB

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INSPECTION PROCEDURE 6: Forgotten Key Prevention Function does not Operate (Center Door 
Locking System Function Works Normally) <Vehicles with keyless entry system>.

AC004333AB

Key Reminder Switch Circuit

AC004969

CONNECTOR: C-72

AC

C-72 (B)

AC004311BB

CONNECTORS: D-11, D-27 

D-11

D-27 (B)

JUNCTION BLOCK

(REAR)

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TECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU operates the forgotten key preven-
tion function, based on the input signals from the fol-
lowing switches:

• Key reminder switch

• Driver's or front passenger's door switch

If the function does not work normally, a defect on 
the relevant circuit or the ETACS-ECU may be sus-
pected.

.

TROUBLESHOOTING HINTS

• Malfunction of the key reminder switch

• Malfunction of the driver's or front passenger's 

door switch

• Malfunction of the ETACS-ECU

• Damaged harness wires or connectors

AC004311BC

CONNECTORS: D-13, D-14

JUNCTION BLOCK

(REAR)

D-14 (B)

D-13

AC004968

CONNECTOR: D-16

AC

D-16

AC004311BD

CONNECTOR: D-26 

JUNCTION BLOCK

(REAR)

D-26 (B) 

AC004329AF

E-33

CONNECTORS: E-33, E-46

E-46

AC005005AB

E-42

E-41

CONNECTORS: E-41, E-42

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DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• 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

STEP 1.Choose method of ETACS-ECU input signal check.
Q: Is the ETACS-ECU input signal check performed by 

scan tool MB991958 or a voltmeter?
By Scan tool MB991958 : Go to Step 2.
By a Voltmeter <Key reminder switch input signal 
check> : Go to Step 3.
By a Voltmeter <Front driver’s door switch input signal 
check> : Go to Step 4.
By a Voltmeter <Front passenger’s door switch input 
signal check> : Go to Step 5.

STEP 2. Check the input signal (by using the pulse check) 
(by using MB991958).
Check the ETACS-ECU input signal (key reminder switch or 
front door switches) by using scan tool MB991958.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Operate scan tool MB991958 as follows:

1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."

(3) Insert the key to the ignition switch.
(4) Open the front driver’s door or front passenger’s door.
(5) Check that scan tool MB991958 sounds
Q: Does the tone alarm of scan tool MB991958 sound when 

the input signal enters?
YES : Replace the ETACS-ECU and then go to Step 19.
NO <Key reminder switch input signal> : Go to Step 6.
NO <Front driver’s door switch input signal> : Go to 

Step 11.

NO <Front passenger’s door switch input signal> : Go 

to Step 15.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN