Code No.B2402: STL unit comm.(system ID)
Code No.B2403: STL unit comm.(CRC)
Code No.B2404: STL unit comm.(function code)
Code No.B2405: STL unit comm.(rolling code)
Code No.B2406: STL unit comm.(PTC operate)
Code No.B2407: STL unit comm.(EEPROM)
Code No.B2408: STL unit comm.(solenoid)


caution
  • If the diagnosis code No. 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 normal.










DIAGNOSIS FUNCTION




  • 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 operation 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 steering lock unit and KOS-ECU, or solenoid failure

TROUBLE JUDGMENT


Range of check
  • When the IG knob unlock communication is performed by pressing the ignition push switch
Judgement 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

PROBABLE CAUSES



  • Malfunction of the key reminder switch (integrated into the steering lock unit)
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of the KOS-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Connector check: C-211 Key reminder switch connector, C-104 KOS-ECU connector

Q. Is the check result normal?
Go to Step 3.
Repair the defective connector.

STEP 3. Check the wiring harness between the C-211 key reminder switch connector terminal No. 12, 9 and the C-104 KOS-ECU connector terminal No. 4, 5.

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

Q. Is the check result normal?
Go to Step 4.
Repair the wiring harness.

STEP 4. Replace the key reminder switch, and check whether the diagnosis code is reset.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?
Replace KOS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Deal with Intermittent Malfunction ).