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
When the ignition push switch is pressed, the steering 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 diagnosis code is set.
JUDGEMENT CRITERIA
When the IG knob unlock communication is performed by pressing the ignition push switch,
if the steering lock unit communication error (no response) occurs, the steering lock unit is
judged as abnormal.
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 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 ).