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

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

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.





(1)
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).

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 CAN Bus Diagnostics Chart).

STEP 2. Register the keyless ID and recheck the diagnostic trouble code.

Register the keyless ID (Refer to Wireless Control Module (WCM)), 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 (Refer to Wireless Control Module (WCM)).
NO The procedure is complete.