B1A0C

DTC B1A08: Keyless/KOS key1 performance
DTC B1A09: Keyless/KOS key2 performance
DTC B1A0A: Keyless/KOS key3 performance
DTC B1A0B: Keyless/KOS key4 performance
DTC B1A0C: Keyless key 5 performance
DTC B1A0D: Keyless key 6 performance
DTC B1A0E: Keyless key 7 performance
DTC B1A0F: Keyless key 8 performance

CAUTION:
When replacing the ECU, always check that the communication circuit is normal.

DTC SET CONDITION

The door locking/unlocking code is automatically updated every time the doors are locked (rolling code). WCM stores DTC B1A08, B1A09, B1A0A, B1A0B, B1A0C, B1A0D, B1A0E, or B1A0F when it receives wrong signal (rolling code out of synchronization) from the transmitter.

TECHNICAL DESCRIPTION (COMMENT)

- B1A08: WCM determines that the abnormality is present when the rolling code received from the transmitter 1 (the first transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
- B1A09: WCM determines that the abnormality is present when the rolling code received from the transmitter 2 (the second transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
- B1A0A: WCM determines that the abnormality is present when the rolling code received from the transmitter 3 (the third transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
- B1A0B: WCM determines that the abnormality is present when the rolling code received from the transmitter 4 (the fourth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
- B1A0C: WCM determines that the abnormality is present when the rolling code received from the transmitter 5 (the fifth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
- B1A0D: WCM determines that the abnormality is present when the rolling code received from the transmitter 6 (the sixth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
- B1A0E: WCM determines that the abnormality is present when the rolling code received from the transmitter 7 (the seventh transmitter registered in WCM) greatly differs from the rolling code stored in WCM.
- B1A0F: WCM determines that the abnormality is present when the rolling code received from the transmitter 8 (the eighth transmitter registered in WCM) greatly differs from the rolling code stored in WCM.

TROUBLESHOOTING HINTS

- Rolling code out of synchronization
- Malfunction of the transmitter
- Malfunction of the WCM

DIAGNOSIS

STEP 1. Synchronize the rolling code and recheck the diagnostic trouble code.

(1)Synchronize the rolling code.

- Push the lock button or unlock button of transmitter twice or more.
- If the keyless operation does not resume by the procedure above, register the key again (Refer to Configuration Function ).

(2)Recheck if the diagnostic trouble code is set.

.....Push the lock button or unlock button of transmitter.

.....Check if the diagnostic trouble code is set.

Q. Is the DTC set?

YES Go to Step 2.

NO The diagnosis is complete.

STEP 2. Check whether the diagnostic trouble code is reset.

Replace the transmitter by which the diagnostic trouble code is set with a new one, register the key (Refer to Inspection Procedure 5), and recheck if the diagnostic trouble code is set.
(1)Push the lock button or unlock button of transmitter.

(2)Check if the diagnostic trouble code is set.

Q. Is the DTC set?

YES Replace WCM and register the ID codes (Refer to How to Cope With Intermittent Malfunctions).

NO The diagnosis is complete.