Wireless Control Module (WCM)

DTC B2401: Keyless/KOS key ID not register

CAUTION:
- If 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
WCM sets DTC B2401 when no transmitter is registered in it.

TECHNICAL DESCRIPTION (COMMENT)
WCM determines that the abnormality is present when the number of the transmitters registered in it is 0.

TROUBLESHOOTING HINTS
- Failure of transmitter registration process
- Malfunction of WCM

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.

CAUTION: To prevent damage to scan tool (MB991958), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (MB991958).

1. Connect scan tool MB991958 to the data link connector.
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.

Q: Is the CAN bus line found to be normal?

YES : Go to Step 2.

NO : Repair the CAN bus line (Refer to Controller area network Diagnosis ).

STEP 2. Register the transmitter and recheck the diagnostic trouble code.

Register the keyless entry secret code, 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.

Q: Is the DTC set?

YES : Replace WCM and register the ID codes.

NO : The procedure is complete.