Mitsubishi Evolution X. Manual - part 534

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-43

DTC B2352: Antenna fail

CAUTION

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

.

DTC SET CONDITION

If an open circuit or short to ground occurs in the 
antenna, KOS-ECU sets DTC B2352.

.

TECHNICAL DESCRIPTION (COMMENT)

When the ignition switch is turned ON with the emer-
gency operation by the inversely-inserted keyless 
operation key, KOS-ECU sends signals to the 
receiver antenna module. The receiver antenna 
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 at 
this time, KOS-ECU determines that there is a prob-
lem.

.

TROUBLESHOOTING HINTS

• Malfunction of the receiver antenna module

• Damaged wiring harness and connectors

• Malfunction of KOS-ECU

Receiver Antenna  Module and KOS-ECU Circuit

IMMOBILIZER
ANTENNA

KEYLESS
OPERATION
KEY

RECEIVER ANTENNA
MODULE

KOS-ECU

EMERGENCY
KEY

KEY ID

JOINT
CONNECTOR (6)

AC708950AZ

Connector: C-05

AC708951CG

Connectors: C-08, C-16

C-16 (B)

C-08

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-44

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

KOS-ECU connector C-05 and joint connector (6) C-16 
in good condition?
YES : Go to Step 2.
NO :  Repair the defective connector.

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-45

STEP 2. Check the wiring harness between the receiver 
antenna module connector C-08 (terminal Nos. 2, 1, 8, 12) 
and the KOS-ECU connector C-05 (terminal Nos. 11, 12, 32, 
7) for open circuit.
(1) Disconnect reciever anntena module connector C-08 and 

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

(2) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.2) and KOS-ECU 
connector C-05 (terminal No.11)

OK: Continuity exists (2 

Ω or less)

(3) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.1) and KOS-ECU 
connector C-05 (terminal No.12)

OK: Continuity exists (2 

Ω or less)

(4) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.8) and KOS-ECU 
connector C-05 (terminal No.32)

OK: Continuity exists (2 

Ω or less)

AC709707

Harness side: C-05

DZ

Harness side: C-08

AC709707

Harness side: C-05

DZ

Harness side: C-08

AC709707

Harness side: C-05

EB

Harness side: C-08

DIAGNOSIS

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KEYLESS OPERATION SYSTEM (KOS)

42B-46

(5) Check the wiring harness between reciever anntena 

module connector C-08 (terminal No.12) and KOS-ECU 
connector C-05 (terminal No.7)

OK: Continuity exists (2 

Ω or less)

Q: Is the wiring harness between receiver antenna module 

connector C-08 (terminal Nos. 2, 1, 8, 12) and the 
KOS-ECU connector C-05 (terminal Nos. 11, 12, 32, 7) in 
good condition?
YES  : Go to Step 3.
NO (receiver antenna module connector C-08 terminal 
No.2 

− KOS-ECU connector C-05 terminal No.11.) : 

Repair the wiring harness between receiver antenna 
module connector C-08  (terminal No. 2) and the 
KOS-ECU connector C-05 (terminal No. 11).

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

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

Repair the wiring harness between receiver antenna 
module connector C-08  (terminal No. 1) and the 
KOS-ECU connector C-05 (terminal No. 12).

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

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

Repair the wiring harness between receiver antenna 
module connector C-08  (terminal No. 8) and the 
KOS-ECU connector C-05 (terminal No. 32).

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

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

Repair the wiring harness between receiver antenna 
module connector C-08  (terminal No. 12) and the 
KOS-ECU connector C-05 (terminal No. 7).

AC709707EC

Harness side: C-08

Harness side: C-05