how to check the CAN communication with control unit N80 (Steering column module) in your vehicle.

In this blog post, I will show you how to check the CAN communication with control unit N80 (Steering column module) in your vehicle. This is a useful diagnostic procedure to identify any faults or errors in the steering system.

The CAN (Controller Area Network) is a serial bus system that connects various electronic control units (ECUs) in a vehicle. The CAN communication allows the ECUs to exchange data and coordinate functions. The control unit N80 is responsible for the steering column module, which includes the steering angle sensor, the steering lock, and the ignition switch.

To check the CAN communication with control unit N80, you will need a scan tool that can access the CAN bus and read the diagnostic trouble codes (DTCs) stored in the ECUs. You will also need a wiring diagram and a multimeter to measure the voltage and resistance of the CAN wires.

The steps to check the CAN communication with control unit N80 are as follows:

1. Connect the scan tool to the OBD-II port under the dashboard and turn on the ignition. Select the control unit N80 from the scan tool menu and read the DTCs. If there are any DTCs related to the CAN communication, such as U0001 or U0100, it indicates a problem with the CAN bus or the control unit N80.

2. Locate the CAN wires that connect to the control unit N80. You can use the wiring diagram to find the color and pin number of the wires. The CAN wires are usually twisted together and have a characteristic green and yellow color.

3. Disconnect the battery negative terminal and unplug the connector from the control unit N80. Use the multimeter to measure the resistance between the two CAN wires at the connector. The resistance should be around 60 ohms. If it is too high or too low, it indicates a short circuit or an open circuit in the CAN bus.

4. Reconnect the battery negative terminal and turn on the ignition. Use the multimeter to measure the voltage between each CAN wire and ground at the connector. The voltage should be around 2.5 volts. If it is too high or too low, it indicates a faulty control unit N80 or another ECU on the CAN bus.

5. Plug in the connector to the control unit N80 and clear the DTCs with the scan tool. Start the engine and check if the steering system works normally. If there are still DTCs or symptoms related to the CAN communication, you may need to replace or repair the control unit N80 or another ECU on the CAN bus.

I hope this blog post was helpful for you to check the CAN communication with control unit N80 in your vehicle. If you have any questions or comments, please feel free to leave them below.