Case IH 517646-02 - VCM – VCM: Loss of communication between the vehicle controller and the monitor

The Vehicle Control Module has lost its Controller Area Network (CAN) communication link with the cab display/monitor. This means the VCM is unable to send or receive data to the operator's screen.

• MAGNUM AFS Connect
• Magnum 400 AFS Connect

1. 1

   Verify battery and system voltage, as low voltage can cause modules to drop off the network or fail to broadcast their IDs properly.

2. 2

   Check CAN bus integrity by inspecting the wiring harness connecting the VCM to the AFS Pro display monitor.

3. 3

   Inspect connectors at the VCM and the display monitor for pushed-out pins, corrosion, or moisture.

1. 1

   Disconnect battery

   Disconnect the negative battery terminal before servicing the electrical system.

2. 2

   Disconnect harness connectors

   Locate the VCM and the cab monitor display. Disconnect their main harness connectors.

3. 3

   Test CAN wires

   Use a multimeter to test the CAN High and CAN Low wires for continuity between the VCM and the monitor. Repair any open or shorted wires in the harness.

4. 4

   Clear fault codes

   Clear the inactive/pending fault codes and cycle the key to verify the communication is restored and the codes do not return.