Mitsubishi Evolution X. Manual - part 572

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-195

STEP 9. Check the wiring harness between the receiver 
antenna assembly connector D-14 (terminal Nos.1, 8, 12, 3, 
5) and the KOS-ECU connector C-05 (terminal Nos.12, 32, 
7, 9, 13) for open circuit.
(1) Disconnect reciever anntena assembly connector D-14 and 

KOS-ECU connector C-05, and check the wiring harness.

(2) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.1) and KOS-ECU 
connector C-05 (terminal No.12)

OK: Continuity exists (2 

Ω or less)

(3) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.8) and KOS-ECU 
connector C-05 (terminal No.32)

OK: Continuity exists (2 

Ω or less)

(4) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.12) and KOS-ECU 
connector C-05 (terminal No.7)

OK: Continuity exists (2 

Ω or less)

(5) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.3) and KOS-ECU 
connector C-05 (terminal No.9)

OK: Continuity exists (2 

Ω or less)

AC709707

AC709707

Harness side: C-05

DK

Harness side: D-14

AC709707

Harness side: C-05

DL

Harness side: D-14

AC709707DM

Harness side: D-14

Harness side: C-05

AC709707DN

Harness side: C-05

Harness side: D-14

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-196

(6) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.5) and KOS-ECU 
connector C-05 (terminal No.13)

OK: Continuity exists (2 

Ω or less)

Q: Is the wiring harness between receiver antenna 

assembly connector D-14 (terminal Nos.1, 8, 12, 3, 5) 
and the KOS-ECU connector C-05 (terminal Nos.12, 32, 
7, 9, 13) in good condition?
YES  : Go to Step 10.
NO (receiver antenna assembly connector D-14 terminal 
No.1  

− KOS-ECU connector C-05 terminal No.12.) : 

Repair the wiring harness between receiver antenna 
assembly connector D-14  (terminal No.1) and the 
KOS-ECU connector C-05 (terminal No.12).

NO (receiver antenna assembly connector D-14 terminal 
No.8 

− KOS-ECU connector C-05 terminal No.32.) : 

Repair the wiring harness between receiver antenna 
assembly connector D-14  (terminal No.8) and the 
KOS-ECU connector C-05 (terminal No.32).

NO (receiver antenna assembly connector D-14 terminal 
No.12 

− KOS-ECU connector C-05 terminal No.7.) : 

Repair the wiring harness between receiver antenna 
assembly connector D-14  (terminal No.12) and the 
KOS-ECU connector C-05 (terminal No.7).

NO (receiver antenna assembly connector D-14 terminal 
No.3 

− KOS-ECU connector C-05 terminal No.9.) : Repair 

the wiring harness between receiver antenna 
assembly connector D-14  (terminal No.3) and the 
KOS-ECU connector C-05 (terminal No.9).

NO (receiver antenna assembly connector D-14 terminal 
No.5 

− KOS-ECU connector C-05 terminal No.13.) : 

Repair the wiring harness between receiver antenna 
assembly connector D-14  (terminal No.5) and the 
KOS-ECU connector C-05 (terminal No.13).

AC709707DO

Harness side: C-05

Harness side: D-14

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-197

STEP 10. Check the wiring harness between the receiver 
antenna assembly connector D-14 (terminal Nos.1, 8, 12, 3, 
5) and the ground for short circuit.
(1) Disconnect reciever anntena assembly connector D-14, 

and check the wiring harness.

(2) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.1) and ground

OK: No continuity

(3) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.8) and and ground

OK: No continuity

(4) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.12) and and ground

OK: No continuity

(5) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.3) and ground

OK: No continuity

AC709707FZ

Harness side: D-14

AC709707FY

Harness side: D-14

AC709707FX

Harness side: D-14

AC709707FW

Harness side: D-14

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-198

(6) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.5) and ground

OK: No continuity

Q: Is the wiring harness between receiver antenna 

assembly connector D-14 (terminal Nos.1, 8, 12, 3, 5) 
and the ground in good condition?
YES  : Go to Step 11.
NO (receiver antenna assembly connector D-14 terminal 
No.1  

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14  (terminal 
No.1) and the KOS-ECU connector C-05 (terminal 
No.12).

NO (receiver antenna assembly connector D-14 terminal 
No.8 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14  (terminal 
No.8) and the ground.

NO (receiver antenna assembly connector D-14 terminal 
No.12 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14  (terminal 
No.12) and the ground.

NO (receiver antenna assembly connector D-14 terminal 
No.3 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14  (terminal 
No.3) and the ground.

NO (receiver antenna assembly connector D-14 terminal 
No.5 

− ground.) : Repair the wiring harness between 

receiver antenna assembly connector D-14  (terminal 
No.5) and the ground.

STEP 11. Check the power supply circuit to the reciever 
antenna assembly. Measure the voltage at reciever 
antenna assembly connector D-14.
(1) Disconnect reciever antenna assembly connector D-14 and 

measure the voltage available at the harness side of the 
connector.

(2) Measure the voltage between terminal No. 12 and ground.

• The voltage should measure 5 volt.

Q: Is the measured voltage 5 volt?

YES : Go to Step 12.
NO :  Replace KOS-ECU and register the ID codes. (Refer 

to 

P.42B-12

.)

AC709707FV

Harness side: D-14

AC608254 CZ

Harness side: D-14