Mercury - Diagnostic Port Assembly 10-Pin SmartCraft CDS Access 8M0046339. Overview. Technicians need quick access to the SmartCraft network, and digging into a helm every time a boat needs diagnostics can get old fast. The Mercury 8M0046339 Diagnostic Port Assembly solves that by giving the boat a dedicated 10-pin access point for CDS tools. It mounts out of sight near the helm, stays protected, and makes service checks faster and cleaner without tearing into panels or pulling apart rigging.. K