Code No.B2409 STL unit comm.(No response)


caution
  • If the diagnosis code No. B2409 is set, diagnose the CAN bus lines.
  • Whenever the steering lock unit is replaced, ensure that the communication circuit is normal.










DIAGNOSIS FUNCTION



JUDGEMENT CRITERIA



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. 9, 11, 12 and the C-104 KOS-ECU connector terminal No. 5, 31, 4.

  • 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 ).