Mitsubishi Evolution X. Manual - part 536

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-51

STEP 2. Replace the battery in the keyless operation key 
and recheck the diagnostic trouble code.
Replace the battery of the keyless operation key for which the 
DTC is set, and check whether the DTC is reset.
(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Go to Step 3.
NO :  The procedure is complete (Discharged battery).

STEP 3. Replace the keyless operation key and recheck 
the diagnostic trouble code.
Replace the keyless operation key for which the DTC is set 
with a new one, register the key ID and keyless operation key 
ID (refer to 

P.42B-12

), and check whether the DTC is reset.

(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) Check if the DTC is set.
Q: Is the DTC set?

YES : Go to Step 4.
NO :  The procedure is complete.

STEP 4. Check receiver antenna module connector C-08, 
receiver antenna assembly connector D-14, KOS-ECU 
connector C-05, joint connector (6) C-16 and intermittent 
connector C-41 for loose, corroded or damaged terminals, 
or terminals pushed back in the connector.
Q: Is the receiver antenna module connector C-08, receiver 

antenna assembly connector D-14, KOS-ECU connector 
C-05, joint connector (6) C-16 and intermittent 
connector C-41 in good condition?
YES : Go to Step 5.
NO :  Repair the defective connector.

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-52

STEP 5. 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-53

(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 6.
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-54

STEP 6. 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 ground

OK: No continuity

(4) Check the wiring harness between reciever anntena 

assembly connector D-14 (terminal No.12) 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