Mitsubishi Evolution X. Manual - part 553

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-119

.

DTC SET CONDITION

If KOS-ECU detects an abnormality in power supply 
of the receiver antenna module or receiver antenna 
assembly, KOS-ECU sets DTC No. B2415.

.

TECHNICAL DESCRIPTION (COMMENT)

When the ignition switch is turned to ON, KOS-ECU 
transmits the signal to the receiver antenna module 
and receiver antenna assembly. The receiver 
antenna module and receiver antenna assembly 
transmits random numbers to the keyless operation 
key when it receives signals from KOS-ECU. If an 
open circuit or short to ground occurs on the wiring 
harness between KOS-ECU and receiver antenna 
module or receiver antenna assembly at this time, 
KOS-ECU determines that there is a problem.

.

TROUBLESHOOTING HINTS

• Malfunction of CAN bus line

• Damaged wiring harness and connectors

• Malfunction of the receiver antenna assembly

• Malfunction of the receiver antenna module

• Malfunction of KOS-ECU

DIAGNOSIS

Required Special Tools:

• 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, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool (MB991958), always turn 
the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool (MB991958).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).

AC708955AM

Connector: D-14

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-120

STEP 2. 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 3.
NO :  Repair the defective connector.

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-121

STEP 3. 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

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KEYLESS OPERATION SYSTEM (KOS)

42B-122

(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 4.
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