Keyless Operation System (KOS)

DTC B2204: Coding data mismatch

CAUTION:

- When the DTC B2204 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 vehicle information data transmitted from the ETACS-ECU via the CAN bus lines is different from that registered in the KOS-ECU, the KOS-ECU sets DTC No. B2204.

TECHNICAL DESCRIPTION (COMMENT)

KOS-ECU determines that the abnormality is present when the vehicle information registered in it does not match the vehicle information on the CAN bus lines.

TROUBLESHOOTING HINTS

- Malfunction of CAN bus line
- Malfunction of KOS-ECU
- Malfunction of ETACS-ECU

DIAGNOSIS

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

(1)
CAUTION:
To prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the 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) Reading and Clearing Diagnostic Trouble Codes."

(2)Turn the power supply mode of the engine switch to ON.

(3)Diagnose the CAN bus line.

(4)Turn the power supply mode of the engine switch to OFF.

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. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code

Check if a coding-related DTC is set in the ETACS-ECU.

Q. Is the DTC set?

YES Troubleshoot the ETACS Electronic Time and Alarm Control System (ETACS).).
Then go to Step 3.
NO Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.

Check again if the DTC is set to the KOS-ECU.

(1)Erase the DTC.

(2)Turn the power supply mode of the engine switch from OFF to ON.

(3)Check if DTC is set.

(4)Turn the power supply mode of the engine switch to OFF.

Q. Is the DTC set?

YES Replace KOS-ECU and register the ID codes. (Refer to ID Codes Registration Procedure.)
NO The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).