If the 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 ID to KOS-ECU fails, KOS-ECU sets the
diagnosis code No. B2400.
JUDGEMENT CRITERIA
Assuming that another keyless operation key has already been registered with KOS-ECU,
if the registration of the keyless operation key ID fails when a new keyless operation key is
added or the existing key is replaced, KOS-ECU determines that there is a problem.
PROBABLE CAUSES
Keyless operation key ID registration failure
Malfunction of the keyless operation key
Malfunction of KOS-ECU
Malfunction of CAN bus line
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. Replace the battery in the keyless operation key and recheck
the diagnosis code.
Replace the battery of the keyless operation key for which the diagnosis code is set,
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?
Go to Step 3.
The diagnosis is complete. (Discharged battery)
STEP 3. Replace the keyless operation key and recheck the diagnosis
code.
Replace the keyless operation key for which the diagnosis code is set with a new one,
register the key ID and keyless operation key ID (refer to ), 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 ).
Repair the CAN bus line (Refer to GROUP 54C -
Troubleshooting 
).
On completion, go to Step 2.