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
Code No.B1A0C Keyless key 5 performance
Code No.B1A0D Keyless key 6 performance
Code No.B1A0E Keyless key 7 performance
Code No.B1A0F Keyless key 8 performance

caution

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

DIAGNOSTIC FUNCTION

The door locking/unlocking code is automatically updated every time the doors are locked (rolling code). WCM stores diagnosis code No. B1A08, B1A09, B1A0A, B1A0B, B1A0C, B1A0D, B1A0E, or B1A0F when it receives wrong signal (rolling code out of synchronisation) from the transmitter.

JUDGEMENT CRITERIA

B1A08: WCM determines that the abnormality is present when the rolling code received from the transmitter 1 (the first transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
B1A09: WCM determines that the abnormality is present when the rolling code received from the transmitter 2 (the second transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
B1A0A: WCM determines that the abnormality is present when the rolling code received from the transmitter 3 (the third transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
B1A0B: WCM determines that the abnormality is present when the rolling code received from the transmitter 4 (the fourth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
B1A0C: WCM determines that the abnormality is present when the rolling code received from the transmitter 5 (the fifth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
B1A0D: WCM determines that the abnormality is present when the rolling code received from the transmitter 6 (the sixth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
B1A0E: WCM determines that the abnormality is present when the rolling code received from the transmitter 7 (the seventh transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
B1A0F: WCM determines that the abnormality is present when the rolling code received from the transmitter 8 (the eighth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.

PROBABLE CAUSES

Rolling code out of synchronisation
Malfunction of the transmitter
Malfunction of the WCM

DIAGNOSTIC PROCEDURE

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

(1)Synchronise the rolling code. Use either way to synchronise the rolling code:

Push the transmitter switches twice or more.
Resister the encrypted code of keyless entry (Refer to ).

note *: Name of the signals to be registered.

(2)Recheck if the diagnosis code is set.
..... Erase the diagnosis code.
..... Push the lock switch or unlock switch of transmitter.
..... 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 transmitter by which the diagnosis code is set with a new one, register the encrypted code and the keyless entry secret code (Refer to

), and recheck if the diagnosis code is set.

(1)Erase the diagnosis code.

(2)Push the lock switch or unlock switch of transmitter.

(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace WCM and register the ID codes (Refer to

The diagnosis is complete.