How to Troubleshoot the B-CAN System

Troubleshoot the B-CAN Circuit Related Problems

Using the HDS (preferred method)

The HDS can check the F-CAN and B-CAN communication status, read and clear the DTCs, display the data list, and perform function test.

NOTE: If the HDS does not communicate with the vehicle, troubleshoot the DLC circuit.

Check for DTCs

1.Connect the HDS to the data link connector (A) located under the driver's side of the dashboard.


2.Turn the ignition switch ON (II).

3.Make sure the HDS communicates with vehicle. If it doesn't troubleshoot the DLC circuit

4.Select the BODY ELECTRICAL, then enter the TEST MODE menu, and check the DTCs.

NOTE: For specific operations, refer to the user's manual that came with the HDS.

5.If any DTCs are indicated, go to the indicated DTCs troubleshooting.

NOTE: If B1008 and B1011 are indicated, troubleshooting the B1008 first (beginning with the lowest number first).

Without the HDS (Use only if the HDS is unavailable)

Special Tools Required
MPCS short connector (  07WAZ-0010100)

If the HDS is unavailable, using the following method, you can easily check the F-CAN and B-CAN communication status and DTCs.

Check for DTCs

1.Turn the ignition switch ON (II).

2.Connect the MPCS short connector (A) to the MICU service check connector (B), and turn the switch (C) on.


3.After 5 to 10 seconds, the DTCs which have been detected and stored individually by various B-CAN unit, will be indicates one by one on the odo/trip display if the communication line between the MICU and the gauge control module is OK.


The unit that has stored the code can be identified by the number shown.

Unit Code Unit 
10 MICU 
50 Gauge control module (tach) 
51 Climate control unit 

NOTE: Also you can check the F-CAN and B-CAN communication status by following methods:

Clear the DTCs

While in DTC indication status, press and hold the SELECT/RESET switch for more than 10 seconds.