Mitsubishi Evolution X. Manual - part 547

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-95

DTC B2410: Rear antenna(indoor) open

CAUTION

When replacing the ECU, always check that the 
communication circuit is normal.

AC609425

KOS-ECU

KEYLESS 
OPERATION 
KEY

SKY  BLUE

SKY  BLUE

SKY  BLUE

SKY  BLUE

RED- BLA

CK

RED- BLA

CK

RED- BLA

CK

RED- BLA

CK

BLA

CK

-WHITE

BLA

CK

-BLUE

BLA

CK

-BLUE

 Inside Transmission Antenna assembly (Rear) Circuit

AC

INSIDE TRANSMISSION 
ANTENNA ASSEMBLY 
(REAR)

AC708950AZ

Connector: C-05

AC708951AZ

Connector: C-23

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-96

.

DTC SET CONDITION

If an open circuit is detected in the inside transmitter 
antenna (rear), the DTC is set.

.

TECHNICAL DESCRIPTION (COMMENT)

When the ignition push switch is pressed, or when 
the antenna open circuit detection request is 
received from the diagnosis function, the failure is 
detected.

.

TROUBLESHOOTING HINTS

• Malfunction of the inside transmitter antenna 

assembly (rear)

• Malfunction of the KOS-ECU

• Damaged wiring harness and connectors

DIAGNOSIS

STEP 1. Check KOS-ECU connector C-05 and inside 
transmitter antenna assembly (rear) connector F-02 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are KOS-ECU connector C-05 and inside transmitter 

antenna assembly (rear) connector F-02 in good 
condition?
YES : Go to Step 2.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that the inside transmitter antenna 

assembly (rear) works normally.

AC708955

Connector: D-11

AO

AC708970AL

Connector: F-02

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-97

STEP 2. Check the wiring harness between the KOS-ECU 
connector C-05 (terminal Nos. 6, 20, 40) and inside 
transmitter antenna assembly (rear) connector F-02 
(terminal Nos. 3, 2, 1) for open circuit.
(1) Disconnect KOS-ECU connector C-05 and inside 

transmitter antenna assembly (rear) connector F-02, and 
check the wiring harness.

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

C-05 (terminal No.6) and inside transmitter antenna 
assembly (rear) connector F-02 (terminal No.3).

OK: Continuity exists (2 

Ω or less)

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

C-05 (terminal No.20) and inside transmitter antenna 
assembly (rear) connector F-02 (terminal No.2).

OK: Continuity exists (2 

Ω or less)

AC709707GE

Harness side: C-05

Harness side: F-02

AC709707 GF

Harness side: C-05

Harness side: F-02

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-98

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

C-05 (terminal No.40) and inside transmitter antenna 
assembly (rear) connector F-02 (terminal No.1).

OK: Continuity exists (2 

Ω or less)

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

(terminal Nos. 6, 20, 40) and inside transmitter antenna 
assembly (rear) connector F-02 (terminal Nos. 3, 2, 1) in 
good condition?
YES  : Go to Step 3.
NO (KOS-ECU connector C-05 terminal No.6 

− inside 

transmitter antenna assembly (rear) connector F-02 
terminal No.3.) : Repair the wiring harness between 

KOS-ECU connector C-05 (terminal No.6) and inside 
transmitter antenna assembly (rear) connector F-02 
(terminal No.3).

NO (KOS-ECU connector C-05 terminal No.20 

− inside 

transmitter antenna assembly (rear) connector F-02 
terminal No.2.) : Repair the wiring harness between 

KOS-ECU connector C-05 (terminal No.20) and 
inside transmitter antenna assembly (rear) connector 
F-02 (terminal No.2).

NO (KOS-ECU connector C-05 terminal No.40 

− inside 

transmitter antenna assembly (rear) connector F-02 
terminal No.1.) : Repair the wiring harness between 

KOS-ECU connector C-05 (terminal No.40) and 
inside transmitter antenna assembly (rear) connector 
F-02 (terminal No.1).

AC709707GG

Harness side: F-02

Harness side: C-05