If the diagnosis
code No. B2413 is set in the steering lock unit, diagnose the CAN bus lines. If there is any
fault in the CAN bus lines, an incorrect diagnosis code may be set. In this case, the set diagnosis
code is not highly reliable.
Whenever the steering lock unit (integrated in the key reminder switch) is replaced,
ensure that the communication circuit is normal.
DIAGNOSIS FUNCTION
If KOS-ECU detects an abnormality in power supply of the steering lock unit, KOS-ECU sets
the diagnosis code No. B2413.
JUDGEMENT CRITERIA
If an abnormality in power supply of the exterior or interior transmitter antenna is detected
when power supply of it is turned on, KOS-ECU determines that there is a problem.
PROBABLE CAUSES
Damaged wiring harness and connectors
Malfunction of the steering lock unit (integrated into the key reminder switch)
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. Voltage measurement at the C-211 key reminder switch connector
(1)Disconnect the connector, and measure at the harness side.
(2)Turn the ignition push switch to the ON position.
(3)Measure the voltage between the key reminder switch connector terminal No. 9 and earth. OK: 5 ±
0.5 V
Q.
Is the check result normal?
Go to Step 4.
Check the C-108 KOS-ECU connector and the
wiring harness between the C-108 KOS-ECU (terminal No. 5) and the C-209 key reminder switch connector
(terminal No. 9), and repair them if necessary. If it is normal, replace KOS-ECU and register
the ID codes (Refer to ).
note
Check the power supply line for open circuit and short circuit.
STEP 4. Connector check: C-104 KOS-ECU connector
Q.
Is the check result normal?
Go to Step 5.
Repair the defective connector.
STEP 5. Check the wiring harness between the C-104 KOS-ECU connector
terminal No. 31 and the C-211 key reminder switch connector terminal No. 11.
Check the earth wires for open circuit.
Q.
Is the check result normal?
Go to Step 6.
Repair the wiring harness.
STEP 6. 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 ).
)
)
)
)
)
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting 
).
On completion, go to Step 2.)