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, B1A09, B1A0A or B1A0B.
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.
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(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 ).
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(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.
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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 key (refer to ), and then check whether the diagnosis
code is set again.
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(1)Push the lock switch or unlock switch of keyless operation key.
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(2)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.