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
If no key ID can be received, KOS-ECU sets the diagnosis code No. B1A35.
JUDGMENT CRITERIA
KOS-ECU determines that the abnormality is present, if it cannot receive the key ID for the keyless operation key when the ignition switch is turned ON.
PROBABLE CAUSES
Insufficient inverse insertion of keyless operation key at the emergency operation
Malfunction of CAN bus line
Malfunction of the keyless operation key
Malfunction of KOS-ECU
Interference of the key ID
Ignition switch ON by the emergency key only
DIAGNOSIS PROCEDURE
STEP 1. Sufficiently insert the keyless operation key in the inverted direction at the emergency operation, and recheck the diagnosis code.
With the emergency operation by the sufficient inverse insertion of keyless operation key, recheck if the diagnosis code is set.
(1)With the emergency operation by the sufficient inverse insertion of keyless operation key, 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 2.
The diagnosis is complete.
STEP 2. 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 3.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
STEP 3. Check the interference of the inversely-inserted keyless operation key at the emergency operation
Check if there are other keys or anything that interferes with the communication (things that generate radio waves such as magnets or air-cleaning devices with a power plug) near the inversely-inserted keyless operation key.
Q.
Are there other keys or anything that interferes with the communication?
Move away or remove other ignition keys or anything that interferes with the communication, and go to Step 4.
Go to Step 5.
STEP 4. Check whether the diagnosis code is reset.
Recheck if the diagnosis code is set.
(1)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.
The diagnosis is complete.
STEP 5. Replace the ignition key with another registered key for the vehicle, and recheck the diagnosis code.
Replace the keyless operation key by which the diagnosis code is set with another key at hand, and recheck if the diagnosis code is set.
(1)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. Register the key ID and recheck the diagnosis code.
Register the key ID of the key by which the diagnosis code is set in Step 5 (refer to ), and recheck if the diagnosis code is set.
(1)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 ignition key with a new one, and recheck the diagnosis code.
Replace the 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)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 KOS-ECU and register the ID codes (Refer to ).
The diagnosis is complete.
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