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DTC B1A24: Key ID not registered
 
 
caution
  • When the DTC B1A24 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DTC SET CONDITION
WCM sets DTC B1A24 when the encrypted code was not registered in it.
 
 
TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present, if the ignition key's key ID is not registered in WCM when the ignition switch is turned ON.
 
 
TROUBLESHOOTING HINTS
  • Key ID not registered
  • Malfunction of the ignition key
  • Malfunction of WCM
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (MB991958), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (MB991958).
Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(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, Diagnosis ).
 
STEP 2. Register the key ID and recheck the diagnostic trouble code.
Register the key ID of the ignition key (refer to ), and recheck if the DTC is set.
(1) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(2) Check if the DTC is set.
Is the DTC set?
Replace WCM and register the ID codes (Refer to ).
The procedure is complete.