When replacing
the ECU, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
The KOS-ECU stores diagnosis code No. B1A25 when the received key ID is different from
the registered one or the key slot cannot communicate with the key correctly.
JUDGEMENT CRITERIA
KOS-ECU determines that the abnormality is present, if the key ID does not match the one registered
in it when the engine switch is turned ON by the keyless operation key.
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?
The engine switch can be turned from LOCK (OFF) to ACC, ON, START positions by operating
all of the keyless operation keys. : Check if the diagnosis code is set. If the diagnosis code is erased, the diagnosis
is complete. If not, go to Step 3.
The engine switch cannot be turned from LOCK (OFF) to ACC, ON, START positions by operating all
of the keyless operation keys. : Check whether diagnosis code B2352 is stored. If diagnosis code B2352 is stored,
go to the troubleshooting (Refer to ). Repeat Step 1. If diagnosis code B2352 is not stored, go to Step 2.
STEP 2. Register the keyless operation key(s) which cannot activate
the engine switch again.
Register the keyless operation key(s) which cannot activate the engine switch again (Refer
to ).
Q.
Is the check result normal?
All of the keyless operation keys can be registered again. : Go to Step 3.
All of the keyless operation keys cannot be registered again. : The keyless operation key(s), which cannot be registered, is defective. Put it
aside. Go to Step 3.
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?
The engine switch can be turned from LOCK (OFF) to ACC, ON, START positions by operating
all of the keyless operation keys. : Check if the diagnosis code is set. If the diagnosis code is erased, the diagnosis
is complete. If not, go to Step 5.
The engine switch cannot be turned from LOCK (OFF) to ACC, ON, START positions by operating all
of the keyless operation keys. : Go to Step 4.
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?
Go to Step 6.
Replace KOS-ECU and register the ID codes (Refer to ).
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?
Go to Step 6.
Replace KOS-ECU and register the ID codes (Refer to ).
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?
Replace KOS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunction ).