Mitsubishi Evolution X. Manual - part 540

 

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Mitsubishi Evolution X. Manual - part 540

 

 

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-67

DTC B2409 STL unit comm.(No response)

CAUTION

• If DTC B2409 is set, diagnose the CAN bus 

lines.

• Whenever the steering lock unit is replaced, 

ensure that the communication circuit is nor-
mal.

.

DTC SET CONDITION

When the ignition push switch is pressed, the steer-
ing lock unit communicates with KOS-ECU to unlock 
the IG knob. If the steering lock unit communication 
error (no response) occurs at this time, the DTC is 
set.

.

TECHNICAL DESCRIPTION (COMMENT)

When the IG knob unlock communication is per-
formed by pressing the ignition push switch, if the 
steering lock unit communication error (no response) 
occurs, the steering lock unit is judged as abnormal.

.

TROUBLESHOOTING HINTS

• Malfunction of the key reminder switch (inte-

grated into the steering lock unit)

• Wiring harness or connector failure of CAN bus 

line

• Malfunction of the KOS-ECU

KOS-ECU

KEY
REMINDER
SWITCH

Key Reminder Switch and KOS-ECU Circuit

AC708950AZ

Connector: C-05

AC708953AC

Connector: C-211

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-68

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

).

STEP 2. Check key reminder switch connector C-211 and 
KOS-ECU connector C-05 for loose, corroded or damaged 
terminals, or terminals pushed back in the connector.
Q: Is the key reminder switch connector C-211 and 

KOS-ECU connector C-05 in good condition?
YES : Go to Step 3.
NO :  Repair the defective connector.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-69

STEP 3. Wiring harness check between C-211 key reminder 
switch connector and C-05 KOS-ECU connector for open 
circuit.
(1) Disconnect C-211 key reminder switch connector and C-05 

KOS-ECU connector.

(2) Measure at the connector side of C-211 key reminder 

switch connector and C-05 KOS-ECU connector.

(3) Measure the resistance between the terminals.

•

C-211 key reminder switch connector terminal No.9 

− 

C-05 KOS-ECU connector terminal No.5.

•

C-211 key reminder switch connector terminal No.11 

− 

C-05 KOS-ECU connector terminal No.31.

•

C-211 key reminder switch connector terminal No.12 

− 

C-05 KOS-ECU connector terminal No.4.

OK: Continuity exists (2

Ω or less)

Q: Is the check result normal?

YES : Go to Step 4.
NO (C-211 key reminder switch connector terminal No.9 
− C-05 KOS-ECU connector terminal No.5.) : An open 

circuit is present in the wiring harness between C-211 
key reminder switch connector terminal No. 9 and 
C-05 KOS-ECU connector terminal No. 5. Repair the 
wiring harness.

NO (C-211 key reminder switch connector terminal 
No.11 

− C-05 KOS-ECU connector terminal No.31.) : An 

open circuit is present in the wiring harness between 
C-211 key reminder switch connector terminal No. 11 
and C-05 KOS-ECU connector terminal No. 31. 
Repair the wiring harness.

NO (C-211 key reminder switch connector terminal 
No.12 

− C-05 KOS-ECU connector terminal No.4.) : An 

open circuit is present in the wiring harness between 
C-211 key reminder switch connector terminal No. 12 
and C-05 KOS-ECU connector terminal No. 4. Repair 
the wiring harness.

AC709710 AB

Harness side: C-05

Harness side: C-211

AC709710 AC

Harness side: C-05

Harness side: C-211

AC709710 AD

Harness side: C-05

Harness side: C-211

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-70

STEP 4. Check the wiring harness between the C-211 key 
reminder switch connector (terminal Nos. 9, 11, 12) and the 
ground for short circuit.
(1) Disconnect C-211 key reminder switch connector, and 

check the wiring harness.

(2) Check the wiring harness between C-211 key reminder 

switch connector (terminal No.9) and ground

OK: No Continuity

(3) Check the wiring harness between C-211 key reminder 

switch connector (terminal No.11) and ground

OK: No Continuity

(4) Check the wiring harness between C-211 key reminder 

switch connector (terminal No.12) and ground

OK: No Continuity

Q: Is the wiring harness between C-211 key reminder 

switch connector (terminal No. 9, 11, 12) and the ground 
in good condition?
YES  : Go to Step 5.
NO (key reminder switch connector C-211 terminal No.9 
− ground.) : Repair the wiring harness between C-211 key 

reminder switch connector (terminal No. 9) and the 
ground.

NO (key reminder switch connector C-211 terminal 
No.11 

− ground.) : Repair the wiring harness between 

C-211 key reminder switch connector (terminal No. 
11) and the ground.

NO (key reminder switch connector C-211 terminal 
No.12 

− ground.) : Repair the wiring harness C-211 key 

reminder switch connector (terminal No. 12) and the 
ground.

AC709703AG

Harness side: C-211

AC709703AH

Harness side: C-211

AC709703AI

Harness side: C-211

 

 

 

 

 

 

 

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