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DTC B1A08: F.A.S.T. key1 fail
DTC B1A09: F.A.S.T. key2 fail
DTC B1A0A: F.A.S.T. key3 fail
DTC B1A0B: F.A.S.T. key4 fail
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
DTC SET CONDITION
If KOS&OSS-ECU receives wrong signal from the keyless operation key, KOS&OSS-ECU memorizes DTCs B1A08, B1A09, B1A0A or B1A0B.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the keyless operation key
  • Malfunction of the KOS&OSS-ECU
 
 
DIAGNOSIS
STEP 1. Operate the keyless operation key, and recheck the diagnostic trouble code.
(1) Operate the keyless operation key as follows:
  • Push the lock switch or unlock switch of keyless operation key five times or more.
  • When the keyless operation is not recovered after performing the above procedure, register the key again (Refer to ).
(2) Push the lock switch or unlock switch of keyless operation key.
(3) Check if the diagnostic trouble code is set.
Is the DTC set?
Perform troubleshooting if KOS&OSS-ECU except DTCs B1A10, B1A11, B1A12 or B1A13 are set. Then go to Step 2.
The diagnosis is complete.
 
STEP 2. Check whether the diagnostic trouble code is set again.
Replace the keyless operation key by which the diagnostic trouble code is set with a new one, register the key (Refer to ), and recheck if the diagnostic trouble code is set.
(1) Push the lock button or unlock button of keyless operation key.
(2) Check if the diagnostic trouble code is set.
Is the DTC set?
Replace KOS&OSS-ECU and register the ID codes (Refer to ).
The diagnosis is complete.