Inspection Procedure
2: The ignition key cannot be registerted using M.U.T.-III.
COMMENTS ON TROUBLE SYMPTOM
If only some ignition keys cannot be registered, the ignition key itself may be faulty.
If no ignition key can be registered, the key assembly may have already been registered for
another vehicle, or the WCM may be faulty.
PROBABLE CAUSES
Malfunction of the ignition key
Damaged wiring harness and connectors
Malfunction of WCM
Ignition key registered for other vehicle
DIAGNOSIS PROCEDURE
STEP 1. Check the ignition key inserted in the key cylinder
for interference.
Q.
Are there other ignition keys or anything that interferes with the communication (things
that generate radio waves such as magnets and an air-cleaning device that has a power plug)
near the ignition key inserted in the key cylinder?
Move away or remove other ignition keys or things that interfere with the communication (things
that generate radio waves such as magnets and a air-cleaning device that has a power plug) near
the ignition key. Then, go to step 2.
Go to Step 3.
STEP 2. Retest the system
Check that the ignition key can be registered.
Q.
Is the check result normal?
The diagnosis is complete.
Go to Step 3.
STEP 3. Check which ignition key cannot be registered.
Q.
Can any one of the ignition keys be registered?
Only some keys : Replace the key that cannot be registered and register the ID codes (Refer to ).
After registering the ID codes, go to Step 5 .
All keys : Go to Step 4.
STEP 4. Retest the system
Check the M.U.T.-III screen when the key was not able to be registered.
Q.
Which error message did the M.U.T.-III display?
Abnormality in key : Carry out diagnosis code No. B1A25: Key ID unmatched and diagnosis code No. B1A35:
Transponder read error (Refer to <B1A25>, <B1A35>).
Then, go to Step 5 .
ECU internal error : Replace WCM and register the ID codes (Refer to ).
After registering the ID codes, go to Step 5.
STEP 5. Retest the system
Check that the ignition key can be registered.
Q.
Is the check result normal?
The diagnosis is complete.
Replace WCM and register the ID codes (Refer to ).
Go to Step 3.
: Replace the key that cannot be registered and register the ID codes (Refer to 
).
After registering the ID codes, go to Step 5 .