Code No.B2450 Switch panel communication error


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.
  • Before replacing the audio unit, be sure to check that the power supply circuit, earth circuit, and communication circuit are normal.

TROUBLE JUDGMENT
If the audio unit cannot establish the communication with centre panel assembly for 1 minute or more, the diagnosis code is set.

COMMENTS ON TROUBLE SYMPTOM
The audio unit, centre panel assembly, or CAN bus line may have a problem.

PROBABLE CAUSES

  • Malfunctions of audio unit
  • Malfunction of centre panel assembly
  • Malfunction of CAN bus line wiring harness and connector

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the 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 ).

STEP 2. Connection status check of audio unit with centre panel assembly
Check that the audio unit are connected to the centre panel assembly without any problem.

Q. Is the connection established?
Go to Step 3.
Securely connect the audio unit with the centre panel assembly.

STEP 3. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the audio unit.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?
Replace the audio unit.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).