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DTC B2401: Keyless/KOS key ID not register
 
 
caution
  • If the DTC B2401 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
If the keyless ID registered transmitter is not registered to the WCM, the WCM sets the DTC No. B2401.
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the number of keyless ID registered transmitter is zero, the WCM determines that there is a problem.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of CAN bus line
  • Failure of transmitter registration process
  • 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 transmitter and recheck the diagnostic trouble code.
Register the keyless ID (Refer to ), and recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is set.
Is the DTC set?
Replace WCM and register the ID codes (Refer to ).
The procedure is complete.