Mitsubishi Outlander GS45X. Manual - part 1143

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-151

STEP 4. Check the wiring harness between KOS-ECU 
connector C-102 (terminal No. 23) and lock/unlock switch 
(front door: RH) connector E-08 (terminal No. 1), and 
lock/unlock switch (front door: RH) connector E-08 
(terminal No. 2) and ground. 

• Check the signal and ground wires for open circuit.

NOTE: Also check intermediate connector C-112 and C-113 for 
loose, corroded, or damaged terminals, or terminals pushed 
back in the connector. If intermediate connector C-112 and 
C-113 is damaged, repair or replace the damaged compo-
nent(s) as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Are the wiring harness between KOS-ECU connector 

C-102 (terminal No. 23) and lock/unlock switch (front 
door: RH) connector E-08 (terminal No. 1), and 
lock/unlock switch (front door: RH) connector E-08 
(terminal No. 2) and ground in good condition?
YES : Go to Step 5.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Check that 
the front passenger’s door lock/unlock switch works 
normally.

STEP 5. KOS communication test.
Using scan tool (M.U.T.-III), perform the antenna communica-
tion test to check that the exterior transmitter antenna (front 
passenger's door) communicates normally (Refer to 

P.42B-197

).

Q: Is the check result normal?

YES : Go to Step 6.
NO :  Perform troubleshooting for the diagnostic trouble 

code No. B240B (Refer to 

P.42B-35

).

STEP 6. Check of the troubles.
Operate the lock/unlock switch (front passenger’s side) to 
check that the door can be locked. 
Q: Is the check result normal?

YES : Intermittent malfunction is suspected. (Refer to 

GROUP 00, How to Use Troubleshooting/Inspection 
Service Points 

− How to cope with intermittent 

malfunctions 

P.00-15

).

NO :  Replace KOS-ECU and register the ID codes (Refer 

to 

P.42B-188

).

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-152

Inspection Procedure 9: The lock switch and open switch of the liftgate lock release handle do 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 outside transmission antenna 

assembly (liftgate)

• Malfunction of the liftgate lock release handle

• Damaged wiring harness and connectors

• Malfunction of the KOS-ECU

ACA02762

KOS-ECU

OPEN 
SWITCH 

LOCK
SWITCH 

LIFTGATE LOCK 
RELEASE HANDLE

Liftgate Lock Release Handle Circuit

AB

BLA

CK

BLA

CK

BLA

CK-

YELLO

W

GRA

Y

BR

O

W

N

B

R

O

WN

BR

O

W

N

GRA

Y

GRA

Y

AC901375AC

Connector: F-09

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-153

DIAGNOSIS

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 Diagnostic Trouble 

Code Chart 

P.42B-35

.

NO :  Go to Step 2.

STEP 2. Check liftgate lock release handle connector F-09 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is liftgate lock release handle connector F-09 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 liftgate lock release handle 

works normally.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-154

STEP 3. Check the wiring harness between liftgate lock 
release handle connector F-09 (terminal No. 2) and ground. 

• Check the ground wires for open circuit.

Q: Are the wiring harness between liftgate lock release 

handle connector F-09 (terminal No. 2) and ground in 
good condition?
YES : Go to Step 4.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Check that 
the liftgate lock release handle works normally.

STEP 4. Liftgate lock release handle check
(1) Remove the liftgate lock release handle (Refer to GROUP 

42A, Liftgate Handle and Latch 

P.42A-174

).

(2) Check continuity when the liftgate lock release handle is 

operated to "ON" or "OFF" position.
<OPEN SWITCH>

<LOCK SWITCH>

Q: Is the liftgate lock release handle normal?

YES : Go to Step 5.
NO :  Replace the liftgate lock release handle. Check that 

the liftgate lock release handle works normally.

STEP 5. KOS communication test
Using scan tool (M.U.T-III), perform the antenna communica-
tion test to check that the outside transmission antenna assem-
bly (liftgate) communicates normally (Refer to 

P.42B-197

).

Q: Is the check result normal?

YES : Go to Step 6
NO :  Perform troubleshooting for diagnostic trouble code 

No. B240C (Refer to 

P.42B-35

).

Switch 
position

Terminal 
number

Normal value

Push (open)

1 

− 2 

Continuity 
exists (2 

Ω or 

less)

Release

1 

− 2 

No continuity

Switch 
position

Terminal 
number

Normal value

Push (lock)

2 

− 3 

Continuity 
exists (2 

Ω or 

less)

Release

2 

− 3 

No continuity

ACA00837AD

Lock switch

Open switch