Mitsubishi Evolution X. Manual - part 580

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-227

STEP 4. Check the wiring harness between the unlock 
sensor (front door: RH) connector E-05 (terminal Nos. 4, 2, 
6) and the ground for short circuit.
(1) Disconnect unlock sensor (front door: RH) connector E-05, 

and check the wiring harness.

(2) Check the wiring harness between unlock sensor (front 

door: RH) connector E-05 (terminal No. 4) and ground

OK: No continuity

(3) Check the wiring harness between unlock sensor (front 

door: RH) connector E-05 (terminal No. 2) and ground

OK: No continuity

(4) Check the wiring harness between unlock sensor (front 

door: RH) connector E-05 (terminal No.6) and ground.

OK: No continuity

Q: Is the wiring harness between unlock sensor (front 

door: RH) connector E-05 (terminal Nos. 4, 2, 6) and the 
ground in good condition?
YES  : Go to Step 5.
NO [unlock sensor (front door: RH) connector E-05 
terminal No.4 

− ground.] : Repair the wiring harness 

between unlock sensor (front door: RH) connector 
E-05 (terminal No.4) and ground.

NO [unlock sensor (front door: RH) connector E-05 
terminal No.2 

− ground.] : Repair the wiring harness 

between unlock sensor (front door: RH) connector 
E-05 (terminal No.2) and the ground.

NO [unlock sensor (front door: RH) connector E-05 
terminal No.6 

− ground.] : Repair the wiring harness 

between unlock sensor (front door: RH) connector 
E-05 (terminal No.6) and the ground.

AC709707IT

Harness side: E-05

AC709707IU

Harness side: E-05

AC209731

AC208731CQ

Harness side: E-05

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-228

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 (passen-
ger's side) communicates normally (Refer to 

P.42B-265

).

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-78

).

STEP 6. Check of the troubles
Operate the unlock sensor (front door: RH) and check that the 
door can be locked.
Q: Is the check result normal?

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

to 

P.42B-12

).

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-229

Inspection Procedure 13: Trunk lid opener 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.

AC609043

KOS-ECU

TRUNK LID 

OPENER

SWITCH

RED

BLUE- YELLO

W

BLUE- YELLO

W

BLUE- YELLO

W

BLA

CK

BLA

CK

 Trunk Lid Opener Switch Circuit

AC

AC708950AW

C-42

Connectors: C-05, C-42

C-05

AC708955AL

Connector: D-17

D-17 (BR)

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-230

.

TROUBLESHOOTING HINTS

• Malfunction of the exterior transmitter antenna 

assembly (trunk lid)

• Malfunction of the trunk lid opener switch

• Damaged wiring harness and connectors

• Malfunction of the KOS-ECU

DIAGNOSIS

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

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

• MB991824: Vehicles 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-10

."

(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-20

.

NO :  Go to Step 2.

AC708970AG

Connectors: F-09, F-27

F-09

F-27

AC608435

Data link connector

MB991827

MB991824

MB991910

AB