Code No.B2415 RA module power voltage

  • If the diagnosis code No. B2415 is set, diagnose the CAN bus lines.
  • When replacing the ECU, always check that the communication circuit is normal.




  • Malfunction of CAN bus line
  • Malfunction of the receiver antenna module
  • Damaged wiring harness and connectors
  • Malfunction of KOS-ECU


STEP 1. M.U.T.-III CAN bus diagnostics

Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ). On completion, go to Step 2.

STEP 2. Connector check: C-34 receiver antenna module connector, C-104 KOS-ECU connector

Q. Is the check result normal?

Go to Step 3.
Repair the defective connector.

STEP 3. Check the wiring harness between the C-34 receiver antenna module connector terminal No. 8, 12 and the C-104 KOS-ECU connector terminal No. 32, 7.

  • Check the power supply and earth wires for open circuit, and check the power supply line for short to earth.

Q. Is the check result normal?

Go to Step 4.
Repair the wiring harness.

STEP 4. Replace the receiver antenna module, and check whether the diagnosis code is reset.

(1)Erase the diagnosis code.
(2)Turn the ignition switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.

Q. Is the diagnosis code set?

Replace KOS-ECU and register the ID codes (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Deal with Intermittent Malfunction ).