DTC B1A08: Keyless/F.A.S.T. key 1 fail; DTC B1A09: Keyless/F.A.S.T. key 2 fail; DTC B1A0A: Keyless/F.A.S.T. key 3 fail; DTC B1A0B: Keyless/F.A.S.T. key 4 fail: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Synchronize the rolling code and recheck the diagnostic trouble code.
Synchronize the rolling codes, and check whether the DTC is stored again.
1. Synchronize the rolling code.
  - Push the lock button or unlock button of keyless operation key twice or more.
  - If the keyless operation does not resume by the procedure above, register the key again (Refer to ON-VEHICLE SERVICE < KOS-ECU > ).
2. Recheck if the diagnostic trouble code is stored.
  1. Push the lock button or unlock button of keyless operation key.
  2. Check if the diagnostic trouble code is stored.
Q: Is the DTC stored?
1. YES: Go to Step 2.
2. NO: The diagnosis is complete.
STEP 2. Check whether the diagnostic trouble code is stored again.
Replace the keyless operation key by which the diagnostic trouble code is stored with a new one, register the key (Refer to ON-VEHICLE SERVICE < KOS-ECU > ), and recheck if the diagnostic trouble code is stored.
1. Push the lock button or unlock button of keyless operation key.
2. Check if the diagnostic trouble code is stored.
Q: Is the DTC stored?
1. YES: Replace KOS-ECU and register the ID codes (Refer to ON-VEHICLE SERVICE < KOS-ECU > ).
2. NO: The diagnosis is complete.