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 DTC B1A10, B1A11, B1A12, or B1A13.
TECHNICAL DESCRIPTION (COMMENT)
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.
TROUBLESHOOTING HINTS
Malfunction of the keyless operation key battery
Malfunction of the keyless operation key
Malfunction of KOS-ECU
DIAGNOSIS
1. Replace the battery in the keyless operation key and recheck the diagnostic trouble code.
2. Replace the keyless operation key and recheck the diagnostic trouble code.
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