TUBE AS 3746303 - Caterpillar

This code signals a lack of communication between the Gateway and the telematic components within the PL522 or 523 enclosure. The lack of communication can be caused by the following actions:
A failure of either the Gateway or Telematic firmware
A failure in the connection of the Gateway and the Telematic componentsTest Step 1. CHECK THE VERSION OF SOFTWARE FOR THE GATEWAY AND TELEMATIC COMPONENTS.By using Caterpillar Electronic Technician (Cat ET ), check the version of software on the Gateway and Telematic components. Click "ECM Summary" and check "Software Group" for Gateway info and "Telematic Device Software" for telematic info.Expected Result:The version of software should be latest provided by Caterpillar.Results:
OK - The version of software is latest version. Proceed to Test Step 2.
NOT OK - The version of software is not the latest version.Repair: Update "VIMS Main Module" to the latest version of software. Clear the diagnostic code.STOPTest Step 2. REPLACE THE PL522 OR 523.Replace the PL522 or 523.Expected Result:The diagnostic code should be cleared.Results:
OK - The diagnostic code was cleared.Repair: Replace the PL522 or 523. Before replacing the PL522 or 523, contact your Caterpillar Technical Communicator. Refer to Systems Operation, Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace".STOP
NOT OK - The diagnostic code was not cleared.Repair: Repeat the diagnostic procedure. If the diagnostic code still exists, contact your Caterpillar Technical Communicator for additional assistance.STOP