Code No.B2400 KOS key registration fail

caution

Keyless operation key or spare key is registered to another vehicle.
If commercial electric products are connected, communication with the keyless operation key or spare key cannot be performed normally, and the key registration may fail. When performing the registration, disconnect all the commercial electric products.
If diagnosis code No. B2400 is set, diagnose the CAN bus lines.
When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSIS FUNCTION

If the registration of the keyless operation key to KOS&OSS-ECU fails, KOS&OSS-ECU sets diagnosis code No. B2400.

JUDGEMENT CRITERIA

If the registration of the keyless operation key ID fails, KOS&OSS-ECU determines that there is a problem.

PROBABLE CAUSES

Keyless operation key or spare key is registered to another vehicle
At the registration, there is an object near the keyless operation key which interferes with the communication.
Wrong keyless operation key registration method
Failure of keyless operation key code registration
Battery drain of keyless operation key
Malfunction of the keyless operation key
Malfunction of CAN bus line
Malfunction of KOS&OSS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Interference check at keyless operation key registration

At the keyless operation key registration, check if there is another key nearby or anything that interferes with the communication (magnets or objects that generate radio waves such as air-cleaning devices with a power plug).

Q. Are there other keys or anything that interferes with the communication?

Move away or remove other keys or anything that interferes with the communication.

Go to Step 2.

STEP 2. Check of keyless operation key registration method

Check that the correct method was used at the registration of keyless operation key.

Q. Is the check result normal?

Go to Step 3.

STEP 3. 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 4.

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting

). On completion, go to Step 4.

STEP 4. M.U.T.-III diagnosis code

Check if any diagnosis code is set in the KOS&OSS-ECU.

Q. Is the diagnosis code set?

Refer to Diagnosis code chart

Go to Step 5.

STEP 5. Register the keyless operation key again and recheck the diagnosis code

(1)Register the keyless operation key again.

(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace KOS&OSS-ECU and register the ID codes (Refer to

The diagnosis is complete.