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; DTC B1A0C: Keyless key 5 fail; DTC B1A0D: Keyless key 6 fail; DTC B1A0E: Keyless key 7 fail; DTC B1A0F: Keyless key 8 fail: Diagnosis

WARNING: This page is about a different car, the 2023 Mitsubishi Eclipse Cross. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Synchronize the rolling code and recheck the DTC .
1. Synchronize the rolling code.
  - Push the lock switch or unlock switch of transmitter twice or more.
  - If the keyless entry system does not resume by the procedure above, register the key again (Refer to POWER DOOR LOCKS WITH SELECTIVE UNLOCKING INSPECTION <VEHICLES WITH ELECTRIC RETRACTABLE REMOTE CONTROLLED DOOR MIRRORS> ).
2. Recheck if the DTC is set.
  CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-IIISE).
  1. Connect scan tool (M.U.T.-IIISE). Refer to SPECIAL TOOLS .
  2. Push the lock switch or unlock switch of transmitter.
  3. Check if the DTC is set.
Q: Is the DTC set?

YES: Go to Step 2.

NO: The diagnosis is complete.
STEP 2. Check whether the DTC is set again .
Replace the transmitter by which the DTC is set with a new one, register the key (Refer to POWER DOOR LOCKS WITH SELECTIVE UNLOCKING INSPECTION <VEHICLES WITH ELECTRIC RETRACTABLE REMOTE CONTROLLED DOOR MIRRORS> .), and recheck if the DTC is set.
1. Push the lock switch or unlock switch of transmitter.
2. Erase the DTC.
3. Check if the DTC is set.
Q: Is the DTC set?

YES: Replace ETACS-ECU and register the ID codes (Refer to POWER DOOR LOCKS WITH SELECTIVE UNLOCKING INSPECTION <VEHICLES WITH ELECTRIC RETRACTABLE REMOTE CONTROLLED DOOR MIRRORS> ).

NO: The diagnosis is complete.