Mitsubishi Outlander GS45X. Manual - part 1141

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-143

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code.

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. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.42B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the KOS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the KOS-ECU. Refer to 

P.42B-35

.

NO :  Go to Step 3.

STEP 3. Check the central door locking operation
Check that the central door locking system works normally.
Q: Is the check result normal?

YES : Go to Step 4.
NO :  Perform troubleshooting for the central door locking 

system (Refer to GROUP 42A 

− Door − 

Troubleshooting 

P.42A-37

).

STEP 4. Check the customize function.
Check that either of the followings other than "ENG strt enable" 
or "Both disabled" are set for "KOS feature" with the customiza-
tion function.

• Both enable

• Door Entry enable

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Set either of the followings other than "ENG strt 

enable" or "Both disabled" for "KOS feature" with the 
customization function (Refer to 

P.42B-199

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-144

STEP 5. Key reminder switch check
(1) Disconnect the C-315 ETACS-ECU connector.
(2) Measure the resistance at the harness-side connector with 

the ignition key removed from the ignition key cylinder.

(3) Check for continuity between the C-315 ETACS-ECU 

connector terminal No. 13 and the ground.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Check the C-213 key reminder switch connector, the 

C-315 ETACS-ECU connector, the wiring harness 
between the C-213 key reminder switch connector 
(terminal No. 3) and the C-315 ETACS-ECU 
connector (terminal No. 13), and between the C-213 
key reminder switch connector (terminal No. 2) and 
the ground. If they are normal, replace the key 
reminder switch.

STEP 6. Check with another registered keyless operation 
key.
Q: Does the IG knob turn? (Is the keyless operation key 

recognized?)
YES : Replace the keyless operation key with which the IG 

knob does not turn (no recognition) and register the 
ID codes (Refer to 

P.42B-15

).

NO :  Go to Step 7.

STEP 7. Check of the troubles
Operate the lock/unlock switch and check that the door can be 
locked and unlocked.
Q: Is the check result normal?

YES : The procedure is complete.
NO :  Replace KOS-ECU and register the ID codes (Refer 

to 

P.42B-15

).

AC209731

Connector C-315
(harness side)

AC208731BP

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-145

Inspection Procedure 7: Driver's door lock/unlock switch does not work.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the ground circuit and the com-
munication circuit are normal.

.

PROBABLE CAUSES

• Malfunction of the exterior transmitter antenna 

assembly (driver's side)

• Malfunction of the lock/unlock switch (front door: 

LH)

• Damaged wiring harness and connectors

• Malfunction of the KOS-ECU

ACA20773AB

Lock/unlock switch (Front Door: LH) Circuit

LOCK/UNLOCK SWITCH 
(FRONT DOOR: LH)

KOS-ECU

AC901075AI

Connectors: C-102, C-126,C-127

C-102

C-127 (BR)

C-126

AC702239

Connector: E-23

E-23 (GR)

AC

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-146

DIAGNOSTIC PROCEDURE

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

•  MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic 
trouble code.

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. Refer to "How to connect 

scan tool (M.U.T.-III) 

P.42B-13

."

(2) Turn the ignition switch to the "ON" position.
(3) Check whether the KOS-ECU related DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Diagnose the KOS-ECU. Refer to 

P.42B-35

.

NO :  Go to Step 2.

STEP 2. Check KOS-ECU connector C-102 and lock/unlock 
switch (front door: LH) connector E-23 for loose, corroded 
or damaged terminals, or terminals pushed back in the 
connector.
Q: Are KOS-ECU connector C-102 and lock/unlock switch 

(front door: LH) connector E-23 in good condition?
YES : Go to Step 3.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that the driver’s door lock/unlock 

switch works normally.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector