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)Synchronise the rolling codes as follows:

  • Push the lock switch or unlock switch of keyless operation key twice or more.
  • When the keyless operation is not recovered after performing the above procedure, register the key again (refer to ).
(2)Recheck if the diagnosis code is set.
..... Push the lock switch or unlock switch of keyless operation key.
..... Check if the diagnosis code is set.

Q. Is the diagnosis code set?





STEP 2. Check whether the diagnosis code is reset.



(1)Push the lock switch or unlock switch of keyless operation key.
(2)Check if the diagnosis code is set.

Q. Is the diagnosis code set?