Code No.B1A24 Transponder ID not registered
caution
When replacing the ECU, always check that the communication circuit is normal.
DIAGNOSIS FUNCTION
KOS&OSS-ECU sets diagnosis code No. B1A24 when the key ID was not registered in it.
JUDGEMENT CRITERIA
KOS&OSS-ECU determines that the abnormality is present, if the key ID is not registered in it when the ignition switch is turned "ON".
PROBABLE CAUSES
Key ID not registered
Malfunction of KOS&OSS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Register the key ID
Refer to the separate manual "How to register an ID" to register the keyless operation key ID.
Q. Is the key ID registration complete?
Go to Step 2.
Perform troubleshooting (Refer to
).
STEP 2. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the KOS&OSS-ECU.
Q. Is the diagnosis code set?
Replace KOS&OSS-ECU and register the ID codes (Refer to
).
The diagnosis is complete.
Go to Step 2.
Perform troubleshooting (Refer to 
).Replace KOS&OSS-ECU and register the ID codes (Refer to ).The diagnosis is complete.