Mitsubishi Evolution X. Manual - part 569

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-183

STEP 12. Check the wiring harness between the receiver 
antenna module connector C-08 (terminal Nos. 2, 1, 8, 12) 
and the ground for short circuit.
(1) Disconnect reciever anntena module connector C-08, and 

check the wiring harness.

(2) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.2) and ground

OK: No continuity

(3) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.1) and ground

OK: No continuity

(4) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.8) and ground

OK: No continuity

AC709707HK

Harness side: C-08

AC709707GA

Harness side: C-08

AC709707HL

Harness side: C-08

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-184

(5) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.12) and ground

OK: No continuity

Q: Is the wiring harness between receiver antenna module 

connector C-08 (terminal Nos. 2, 1, 8, 12) and the ground 
in good condition?
YES  : Go to Step 13.
NO (receiver antenna module connector C-08 terminal 
No.2 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 2) and the ground.

NO (receiver antenna module connector C-08 terminal 
No.1 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 1) and the ground.

NO (receiver antenna module connector C-08 terminal 
No.8 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 8) and the ground.

NO (receiver antenna module connector C-08 terminal 
No.12 

− ground.) : Repair the wiring harness between 

receiver antenna module connector C-08  (terminal 
No. 12) and the ground.

STEP 13. Replace the receiver antenna module, and retest 
the system.
Check that the keyless operation key can be registered.
Q: Is the keyless operation key that cannot be registered 

using scan tool?
YES : Replace KOS-ECU and register the ID codes (Refer 

to 

P.42B-12

).

NO :  The procedure is complete.

AC709707HM

Harness side: C-08

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-185

Inspection Procedure 3: Abnormality in KOS-ECU power supply and ground circuits

CAUTION

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

.

TECHNICAL DESCRIPTION (COMMENT)

If the KOS-ECU does not work at all or if the 
KOS-ECU cannot communicate with the scan tool, 
the KOS-ECU power supply or the ground circuit 
may be defective.

KOS-ECU  Power Supply Circuit

IG1
RELAY

POWER
SUPPLY

KOS-ECU

ETACS-ECU

AC708950AZ

Connector: C-05

AC708972AB

Connector: C-317

Junction block

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-186

.

TROUBLESHOOTING HINTS

• Damaged wiring harness and connectors

• Malfunction of KOS-ECU

DIAGNOSIS

Required Special Tools:

• MB992006: Extra fine probe

• MB991223: Harness set

STEP 1. Check KOS-ECU connector C-05 and ETACS-ECU 
connector C-317 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Is the KOS-ECU connector C-05 and ETACS-ECU 

connector C-317 in good condition?
YES : Go to Step 2.
NO :  Repair the defective connector.

STEP 2. Check the wiring harness between the KOS-ECU 
connector C-05 (terminal No.38, 39) and the ETACS-ECU 
connector C-317 (terminal No.10, 5) for open circuit.
(1) Disconnect KOS-ECU connector C-05 and ETACS-ECU 

connector C-317, and check the wiring harness.

(2) Check the wiring harness between KOS-ECU connector 

C-05 (terminal No.38) and ETACS-ECU connector C-317 
(terminal No.10)

OK: Continuity exists (2 

Ω or less)

(3) Check the wiring harness between KOS-ECU connector 

C-05 (terminal No.39) and ETACS-ECU connector C-317 
(terminal No.5)

OK: Continuity exists (2 

Ω or less)

Q: Is the wiring harness between KOS-ECU connector C-05 

(terminal No.38, 39) and the ETACS-ECU connector 
C-317 (terminal No.10, 5) in good condition?
YES : Go to Step 3.
NO :  Repair the wiring harness between KOS-ECU 

connector C-05 (terminal No.38, 39) and the 
ETACS-ECU connector C-317 (terminal No.10, 5).

AC709707EJ

Harness side: C-05

Harness side: C-317

AC709707EK

Harness side: C-05

Harness side: C-317