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DTC B1A24 Transponder ID not registered
 
 
caution
  • When DTC B1A24 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
The ETACS-ECU sets DTC B1A24 when an ignition key ID is not registered in the ETACS-ECU, or the key, which has been registered in another vehicle, is operated.
 
 
JUDGMENT CRITERIA
The ETACS-ECU sets a DTC when the ignition key ID is not registered in the ETACS-ECU or the key has been registered in another vehicle.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of CAN bus line
  • Key ID not registered
  • Key is registered to another vehicle
  • Malfunction of ETACS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
 
STEP 2. Register the key.
Register the key ID, which the DTC indicates.
Has the key been registered successfully?
Go to Step 3.
Go to Step 4.
 
STEP 3. Using scan tool (M.U.T.-IIISE), read the DTC again.
(1) Erase the DTC.
(2) Remove the ignition key from the cylinder and then insert the ignition key again.
(3) Wait for a few seconds and then turn the ignition "ON".
(4) Check if the DTC is set.
Is the DTC set?
Replace the ETACS-ECU (Refer to ) and register the ID codes (Refer to ).
The diagnosis is complete.
 
STEP 4. Replace the key with a new one, and using scan tool (M.U.T.-IIISE), read the DTC again.
Replace the key, which the DTC indicates, with a new one. Register the key ID for the new one. Then read the DTC.
(1) Replace the ignition key, which the DTC indicates, with a new one. Then register it.
(2) Erase the DTC.
(3) Remove the ignition key from the cylinder and then insert the ignition key again.
(4) Wait for a few seconds, and then turn the ignition "ON".
(5) Check if the DTC is set.
Is the DTC set?
Replace the ETACS-ECU (Refer to ) and register the ID codes (Refer to ).
The diagnosis is complete.