Code No.B1A25 Transponder ID unmatched


caution
  • When the diagnosis code No. B1A25 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSIS FUNCTION


ETACS-ECU sets the diagnosis code No. B1A25 when the received key data is different from the own registered value.

JUDGEMENT CRITERIA


ETACS-ECU determines that the abnormality is present, if the key ID for the ignition key does not match the one registered in ETACS-ECU when the ignition switch is turned ON.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III CAN bus diagnostics


Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2

Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).

STEP 2. Register the key ID and recheck the diagnosis code.


Register the key ID of the ignition key by which the diagnosis code is set (Refer to ), and recheck if the diagnosis code is set.
(1)Register the ignition key which is used when detect the diagnosis code.
(2)Remove the ignition key from the cylinder and then insert the ignition key again.
(3)After 2 or 3 seconds later from inserting the key, then turn the ignition ON.
(4)Check if the diagnosis code is set?

Q. Is the diagnosis code set?

Go to Step 3

The diagnosis is complete.

STEP 3. Replace the ignition key with another registered key for the vehicle, and recheck the diagnosis code.


Replace the ignition key with another ignition key nearby and recheck which the diagnosis code is set if the diagnosis code is set.
(1)Register the ignition key which is used when detect the diagnosis code.
(2)Remove the ignition key from the cylinder and then insert the ignition key again.
(3)After 2 or 3 seconds later from inserting the key, then turn the ignition ON.
(4)Check if the diagnosis code is set?

Q. Is the diagnosis code set?

Go to Step 4

Go to Step 5

STEP 4. Register the key ID and recheck the diagnosis code.


Register the key ID of the ignition key by which the diagnosis code is set in Step 3 (refer to ), and recheck if the diagnosis code is set.
(1)Register the ignition key which is used when detect the diagnosis code.
(2)Remove the ignition key from the cylinder and then insert the ignition key again.
(3)After 2 or 3 seconds later from inserting the key, then turn the ignition ON.
(4)Check if the diagnosis code is set?

Q. Is the diagnosis code set?

Go to Step 5

The diagnosis is complete.

STEP 5. Replace the ignition key with a new one, and recheck the diagnosis code.


Replace the ignition key by which the diagnosis code is set with a new one, register the key ID of the new key, (refer to ), and recheck if the diagnosis code is set.
(1)Register the ignition key which is used when detect the diagnosis code.
(2)Remove the ignition key from the cylinder and then insert the ignition key again.
(3)After 2 or 3 seconds later from inserting the key, then turn the ignition ON.
(4)Check if the diagnosis code is set?

Q. Is the diagnosis code set?

Replace ETACS-ECU and register the ID codes (Refer to ).

The diagnosis is complete.