Code No.B1A10 Keyless/KOS key 1 low battery
Code No.B1A11 Keyless/KOS key 2 low battery
Code No.B1A12 Keyless/KOS key 3 low battery
Code No.B1A13 Keyless/KOS key 4 low battery
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When replacing the ECU, always check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
If KOS&OSS-ECU receives the keyless operation key low battery voltage signal, KOS&OSS-ECU sets diagnosis code No. B1A10, B1A11, B1A12, or B1A13.
JUDGEMENT CRITERIA
- B1A10: If KOS&OSS-ECU receives the keyless operation key 1 (the first keyless operation key registered with KOS&OSS-ECU) low battery voltage signal in five consecutive times, it is judged as abnormal.
- B1A11: If KOS&OSS-ECU receives the keyless operation key 2 (the second keyless operation key registered with KOS&OSS-ECU) low battery voltage signal in five consecutive times, it is judged as abnormal.
- B1A12: If KOS&OSS-ECU receives the keyless operation key 3 (the third keyless operation key registered with KOS&OSS-ECU) low battery voltage signal in five consecutive times, it is judged as abnormal.
- B1A13: If KOS&OSS-ECU receives the keyless operation key 4 (the fourth keyless operation key registered with KOS&OSS-ECU) low battery voltage signal in five consecutive times, it is judged as abnormal.
PROBABLE CAUSES
- Malfunction of the keyless operation key battery
- Malfunction of the keyless operation key
- Malfunction of KOS&OSS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Replace the battery in the keyless operation key and recheck the diagnosis code
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(1)Replace the battery in the keyless operation key.
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(2)Push the lock switch or unlock switch of keyless operation key.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
Perform troubleshooting if KOS&OSS-ECU diagnosis code except No.B1A10, B1A11, B1A12 or B1A13 is set. Then go to Step 2.
The diagnosis is complete.
STEP 2. Check whether the diagnosis code is set again.
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.
Q.
Is the diagnosis code set?
Replace KOS&OSS-ECU and register the ID codes (Refer to ).
The diagnosis is complete.