Code No.B1A08 Keyless/KOS key1 performance
Code No.B1A09 Keyless/KOS key2 performance
Code No.B1A0A Keyless/KOS key3 performance
Code No.B1A0B Keyless/KOS key4 performance


caution When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION



JUDGMENT CRITERIA



  • B1A08: If the difference between the rolling code for the keyless operation key 1 (the first keyless operation key registered with KOS-ECU) and that memorised by KOS-ECU is large, it is judged as abnormal.
  • B1A09: If the difference between the rolling code for the keyless operation key 2 (the second keyless operation key registered with KOS-ECU) and that memorised by KOS-ECU is large, it is judged as abnormal.
  • B1A0A: If the difference between the rolling code for the keyless operation key 3 (the third keyless operation key registered with KOS-ECU) and that memorised by KOS-ECU is large, it is judged as abnormal.
  • B1A0B: If the difference between the rolling code for the keyless operation key 4 (the fourth keyless operation key registered with KOS-ECU) and that memorised by KOS-ECU is large, it is judged as abnormal.

PROBABLE CAUSES



  • Rolling code out of synchronisation
  • Malfunction of the keyless operation key
  • Malfunction of the KOS-ECU

DIAGNOSTIC PROCEDURE


STEP 1. Synchronise the rolling code and recheck the diagnosis code.



(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Press the lock or unlock switch of the keyless operation key for which the diagnosis code is set at least once to synchronise the rolling codes.
(4)Check if the diagnosis code is set.

Q. Is the diagnosis code set?





STEP 2. 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?