Mitsubishi Outlander GS45X. Manual - part 1121

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-63

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 encrypted code and keyless opera-
tion key ID (refer to 

P.42B-15

), 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 : Replace KOS-ECU and register the ID codes. (Refer 

to 

P.42B-15

.)

NO :  The procedure is complete.

DTC B2402: STL unit comm. (system ID), 

 

DTC B2403: STL unit comm. (CRC), 

 

DTC B2404: STL unit comm. (function code), 

 

DTC B2405: STL unit comm. (rolling code), 

 

DTC B2406: STL unit comm. (PTC operate), 

 

DTC B2407: STL unit comm. (EEPROM), 

 

DTC B2408: STL unit comm. (solenoid)

CAUTION

• If the DTC B2402, B2403, B2404, B2405, 

B2406, B2407, or B2408 is set, diagnose the 
CAN bus lines.

• Whenever the steering lock unit is replaced, 

ensure that the communication circuit is nor-
mal.

ACA02753

 Key Reminder Switch and KOS-ECU Circuit

KOS-ECU

KEY
REMINDER
SWITCH

AB

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-64

.

DTC SET CONDITION

When the ignition push switch is pressed, the steer-
ing lock unit communicates with KOS-ECU to unlock 
the IG knob. However, if there is a failure shown 
below, the corresponding DTC is set.

• B2402: System ID (vehicle specific code) failure

• B2403: Cyclic Redundancy Check (CRC): The 

error detection strategy to detect a continuously 
occurring error (burst error), the calculation result 
discrepancy

• B2404: Function code failure

• B2405: Rolling code (automatically changing a 

code for lock/unlock each time when a lock oper-
ation is performed)

• B2406: PTC thermistor continuously activated or 

activated to prevent solenoid abnormal heating 
on the communication with steering lock unit

• B2407: EEPROM failure

• B2408: Communication error between the steer-

ing lock unit and KOS-ECU, or solenoid failure

.

TECHNICAL DESCRIPTION (COMMENT)

Range of check

• When the IG knob unlock communication is per-

formed by pressing the ignition push switch

Judgment criteria

• B2402: Steering lock unit communication error 

(system ID) or received system ID error

• B2403: Steering lock unit communication error 

(CRC) or received frame CRC calculation result 
discrepancy

• B2404: Steering lock unit communication error 

(function code) or received frame function code 
undefined

• B2405: Steering lock unit communication error 

(rolling code) or received rolling code out of the 
permissible range

• B2406: Steering lock unit communication error 

(PTC operation) or PTC thermistor activated to 
prevent solenoid abnormal heating

• B2407: Steering lock unit communication error 

(EEPROM) or RRPROM failure

• B2408: Steering lock unit communication error 

(solenoid) or solenoid failure

.

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

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 (Vehicles with 

CAN communication system)

AC702145

Connector: C-102

AB

AC702217 AB

Connector: C-211

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-65

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-17

).

STEP 2. Check key reminder switch connector C-211 and 
KOS-ECU connector C-102 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-102 in good condition?
YES : Go to Step 3.
NO :  Repair the defective connector.

STEP 3. Check the wiring harness between the key 
reminder switch connector C-211 (terminal No. 12, 9) and 
the KOS-ECU connector C-102 (terminal No. 4, 5).

• Check the signal lines for open circuit and short circuit.

Q: Is the wiring harness between key reminder switch 

connector C-211 (terminal No. 12, 9) and the KOS-ECU 
connector C-102 (terminal No. 4, 5) in good condition?
YES : Go to Step 4.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

DIAGNOSIS

TSB Revision

KEYLESS OPERATION SYSTEM (KOS)

42B-66

STEP 4. Replace the key reminder switch, and check 
whether the diagnostic trouble code is reset.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

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

YES : Replace KOS-ECU and register the ID codes. (Refer 

to 

P.42B-15

.)

NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

DTC B2409: STL unit comm.(No response)

CAUTION

• If the DTC B2409 is set, diagnose the CAN bus 

lines.

• Whenever the steering lock unit is replaced, 

ensure that the communication circuit is nor-
mal.

ACA02754

 Key Reminder Switch and KOS-ECU Circuit

KOS-ECU

KEY
REMINDER
SWITCH

AB