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


The mechanism which automatically changes a code for lock/unlock each time a lock operation is performed is referred to as a rolling code. If KOS-ECU receives wrong signal (out of synchronisation of a rolling code) from the keyless operation key, KOS-ECU memorises the diagnosis code No. B1A08, B1A09, B1A0A or B1A0B.

JUDGMENT CRITERIA




PROBABLE CAUSES




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?

Go to Step 2

The diagnosis is complete.

STEP 2. Check whether the diagnosis code is reset.


Replace the keyless operation key for which the diagnosis code is set with a new one, register the key (refer to ), and then check whether the diagnosis code is set again.
(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?

Replace KOS-ECU and register the ID codes (Refer to ).

The diagnosis is complete.