Code No.B1A25 Key ID unmatched


caution
  • When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA



PROBABLE CAUSES



  • Malfunction of the keyless operation key
  • Malfunction of KOS-ECU
  • Key is registered to another vehicle

DIAGNOSIS PROCEDURE


STEP 1. All of the registered keyless operation keys should allow the engine switch to be turned from OFF to ACC, ON, START positions.


(1)Prepare all of the registered keyless operation keys.
(2)Remove the batteries from all of the keyless operation keys (Refer to ).
(3)Insert one of the keyless operation keys into the key slot.
(4)Check whether the engine switch can be turned from LOCK (OFF) to ACC, ON, START positions.
(5)Turn the engine switch to LOCK (OFF) position again.
(6)Repeat the same procedure for the other keyless operation keys.
(7)Install the batteries to all the keyless operation keys.

Q. Is the check result normal?





STEP 2. Register the keyless operation key(s) which cannot activate the engine switch again.



Q. Is the check result normal?





STEP 3. Register all of the keyless operation keys again.


(1)Register all of the registered keyless operation keys again (Refer to ).
note Exclude the keyless operation key(s) which you put aside on Step 2.
(2)Remove the batteries from all of the keyless operation keys (Refer to ).
(3)Insert one of the keyless operation keys into the key slot.
(4)Check whether the engine switch can be turned from LOCK (OFF) to ACC, ON, START positions.
(5)Turn the engine switch to LOCK (OFF) position again.
(6)Repeat the same procedure for the other keyless operation keys.
(7)Install the batteries to all the keyless operation keys.

Q. Is the check result normal?





STEP 4. Replace the keyless operation key(s) which cannot activate the engine switch with a new one.


(1)Replace the keyless operation key(s) which cannot activate the engine switch with a new one.
(2)Register a new keyless operation key (Refer to ).
(3)Check that all of the registered keyless operation keys allow the engine switch to be turned from OFF to ACC, ON, START positions.
..... Remove the batteries from all of the keyless operation keys (Refer to ).
..... Insert one of the keyless operation keys into the key slot.
..... Check whether the engine switch can be turned from LOCK (OFF) to ACC, ON, START positions.
..... Turn the engine switch to LOCK (OFF) position again.
..... Repeat the same procedure for the other keyless operation keys.
..... Install the batteries to all the keyless operation keys.

Q. Is the check result normal?





STEP 5. Replace the KOS-ECU, and then register all of the keyless operation keys again.


(1)Replace KOS-ECU and register the ID codes (Refer to ).
(2)Register all of the keyless operation keys again (Refer to ).
(3)Check that all of the registered keyless operation keys allow the engine switch to be turned from OFF to ACC, ON, START positions.
..... Remove the batteries from all of the keyless operation keys (Refer to ).
..... Insert one of the keyless operation keys into the key slot.
..... Check whether the engine switch can be turned from LOCK (OFF) to ACC, ON, START positions.
..... Turn the engine switch to LOCK (OFF) position again.
..... Repeat the same procedure for the other keyless operation keys.
..... Install the batteries to all the keyless operation keys.

Q. Is the check result normal?





STEP 6. Check whether the diagnosis code is reset.


(1)Erase the diagnosis code.
(2)Turn the power supply mode of the engine switch from OFF to ON.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?