B2400

DTC B2400: KOS key registration fail

CAUTION:
- If DTC B2400 is set, diagnose the CAN bus lines.
- When replacing the ECU, always check that the communication circuit is normal.

DTC SET CONDITION
If the registration of the keyless operation key ID to KOS-ECU fails, KOS-ECU sets DTC B2400.

TECHNICAL DESCRIPTION (COMMENT)
Assuming that another keyless operation key has already been registered with KOS-ECU, if the registration of the keyless operation key ID fails when a new keyless operation key is added or the existing key is replaced, KOS-ECU determines that there is a problem.

TROUBLESHOOTING HINTS
- Keyless operation key ID registration failure
- Malfunction of the keyless operation key
- Malfunction of KOS-ECU
- Malfunction of CAN bus line

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles 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. Replace the battery in the keyless operation key and recheck the diagnostic trouble code.

Replace the battery of the keyless operation key for which the DTC is set, and check whether the DTC is reset.

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 : Go to Step 3.

NO : The procedure is complete (Discharged battery).

STEP 3. Replace the keyless operation key and recheck the diagnostic trouble code.

Replace the keyless operation key for which the DTC is set with a new one, register the key ID and keyless operation key ID , and check whether the DTC is reset.

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 KOS-ECU and register the ID codes.

NO : The procedure is complete.