B2400

DTC B2400: KOS key registration fail

CAUTION:

- If the 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 the diagnosis code No. 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

- At the registration, there is an object near the keyless operation key which interferes with the communication.
- Wrong keyless operation key registration method
- Failure of keyless operation key code registration
- Battery drain of keyless operation key
- Malfunction of the keyless operation key
- Malfunction of CAN bus line
- Malfunction of OSS-ECU
- Malfunction of KOS-ECU

DIAGNOSIS

STEP 1. Interference check at keyless operation key registration

At the keyless operation key registration, check if there is another key nearby or anything that interferes with the communication (magnets or objects that generate radio waves such as air-cleaning devices with a power plug).

Q. Are there other keys or anything that interferes with the communication?

YES Move away or remove other keys or anything that interferes with the communication.
NO Go to Step 2.
STEP 2. Check of keyless operation key registration method

Check that the correct method was used at the registration of keyless operation key.

Q. Is the check result normal?

YES Go to Step 3.
NO Register the keyless operation key (Refer to ID Codes Registration Procedure).
STEP 3. 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 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 4.
NO Repair the CAN bus line. CAN Bus Diagnostics Chart).
STEP 4. Using scan tool MB991958, read the diagnostic trouble code.

(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 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)Check if any DTC is set to the KOS-ECU.

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

Q. Is the DTC set?

YES Refer to diagnostic trouble code chart Keyless Operation System (KOS).
NO Go to Step 5.
STEP 5. Using scan tool MB991958, read the other system diagnostic trouble code.

(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 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)Check if any DTC is set to the OSS-ECU.

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

Q. Is the DTC set?

YES Perform troubleshooting for the OSS-ECU (Refer to diagnostic trouble code chart Keyless Operation System (KOS)).
On completion, go to Step 6.
NO Go to Step 6.
STEP 6. 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)Turn the power supply mode of the engine switch from OFF to ON.

(2)Check if the DTC is set.

Q. Is the DTC set?

YES Go to Step 7.
NO The procedure is complete (Discharged battery).
STEP 7. 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 encrypted code and keyless operation key ID (refer to ID Codes Registration Procedure), and check whether the DTC is reset.

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

(2)Check if the DTC is set.

Q. Is the DTC set?

YES Go to Step 8.
NO The procedure is complete.
STEP 8. Check whether the diagnostic trouble code is reset.

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

(2)Check if the DTC is set.

Q. Is the DTC set?

YES Replace KOS-ECU and register the ID codes (Refer to ID Codes Registration Procedure).
NO The procedure is complete.