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DTC B1A10: Keyless/KOS
key 1 low battery
DTC B1A11: Keyless/KOS key 2 low battery
DTC B1A12: Keyless/KOS
key 3 low battery
DTC B1A13: Keyless/KOS key 4 low battery
| caution |
When replacing the ECU, always
check that the communication circuit is normal.
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DIAGNOSTIC FUNCTION
If KOS-ECU receives the keyless operation key low battery voltage signal, KOS-ECU sets
the DTC No. B1A10, B1A11, B1A12, or B1A13.
JUDGEMENT CRITERIA
- B1A10: If KOS-ECU receives the keyless operation key
1 (the first keyless operation key registered with KOS-ECU) low battery voltage signal in five
consecutive times, it is judged as abnormal.
- B1A11: If KOS-ECU receives the keyless operation key 2 (the second keyless operation key
registered with KOS-ECU) low battery voltage signal in five consecutive times, it is judged
as abnormal.
- B1A12: If KOS-ECU receives the keyless operation key 3 (the third keyless operation
key registered with KOS-ECU) low battery voltage signal in five consecutive times, it is judged
as abnormal.
- B1A13: If KOS-ECU receives the keyless operation key 4 (the fourth keyless operation
key registered with KOS-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-ECU
DIAGNOSTIC PROCEDURE
STEP 1. Replace the battery in the keyless operation key
and recheck the diagnostic trouble code.
Replace the battery of the keyless operation key for which the DTC is set, and check whether
the DTC is reset.
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(1)Replace the battery of the keyless operation key for which the DTC is set.
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(3)Turn the ignition switch from the LOCK (OFF) position to the ON position.
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(4)Lock or unlock the keyless operation key.
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(5)Check if the DTC is set.
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Q.
Is the DTC set?
Go to Step 2.
The diagnosis is complete (Discharged battery).
STEP 2. Replace the keyless operation key and recheck the diagnostic
trouble code.
Replace the keyless operation key for which the DTC is set with a new one, register the
key ID and keyless operation key ID (refer to 
), and check whether the DTC is
reset.
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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 DTC is set.
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Q.
Is the DTC set?
Replace KOS-ECU and register the ID codes (Refer to ).
The diagnosis is complete.