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DTC B1A10: Keyless/F.A.S.T. key 1 low battery
DTC B1A11: Keyless/F.A.S.T. key 2 low battery
DTC B1A12: Keyless/F.A.S.T. key 3 low battery
DTC B1A13: Keyless/F.A.S.T. key 4 low battery
 
 
cautionWhen 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.