When replacing the ECU, always
check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If KOS-ECU receives the keyless operation key low battery voltage signal, KOS-ECU sets
the diagnosis code No. B1A10, B1A11, B1A12, or B1A13.
JUDGMENT 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
1.Replace the battery in the keyless operation key and recheck the diagnosis code. 2.Replace the keyless operation key and recheck the diagnosis code.