When the diagnosis
code No. B1A35 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. B1A35 when it cannot receive data from the transponder.
JUDGEMENT CRITERIA
ETACS-ECU determines that the abnormality is present, if it cannot receive the key ID
for the ignition key when the ignition switch is turned ON.
PROBABLE CAUSES
Malfunction of CAN bus line
Malfunction of another transponder
Malfunction of receiver antenna
Malfunction of ETACS-ECU
Interference of another transponder
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. 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 or 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 anything that interferes with the communication,
and go to Step 3.
Go to Step 3.
STEP 3. Check whether the diagnosis code is reset.
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 4.
The diagnosis is complete.
STEP 4. Replace the ignition key with another registered key for the
vehicle, and recheck the diagnosis code.
Replace the ignition key by which the diagnosis code is set with another ignition key
nearby, and recheck if the diagnosis code is set.
(1)Remove the ignition key from key cylinder and insert it again then turn the ignition
switch from the Lock (OFF) position to the ON position.
(2)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Go to Step 5.
Go to Step 6.
STEP 5. 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 4 (refer
to ), and recheck if the diagnosis code is set.
(1)Remove the ignition key from key cylinder and insert it again then turn the ignition
switch from the Lock (OFF) position to the ON position.
(2)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Go to Step 6.
The diagnosis is complete.
STEP 6. 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)Remove the ignition key from key cylinder and insert it again then turn the ignition
switch from the Lock (OFF) position to the ON position.
(2)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Go to Step 7.
The diagnosis is complete.
STEP 7. Replace the receiver antenna, and recheck the diagnosis code.
Replace the receiver antenna, register the key ID of the new key (refer to ),
and recheck if the diagnosis code is set.
(1)Remove the ignition key from key cylinder and insert it again then turn the ignition
switch from the Lock (OFF) position to the ON position.
(2)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace ETACS-ECU and register the ID codes (Refer to ).
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting 
).