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.
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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.
JUDGEMENT 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.
Synchronise the rolling codes, and check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(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.
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(4)Check if the diagnosis code is set.
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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 encrypted code and keyless operation key ID (refer to 
),
and check whether the diagnosis code is reset.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
Replace KOS-ECU and register the ID codes (Refer to ).
The diagnosis is complete.