Mercedes EWA WIS EPC installation. (WIS/ASRA Net). EWA WIS EPC – programs of parts catalogs and circuit diagrams. WIS — Werkstatt-Informations-System — database repair, service and wiring. ASRA — Arbeitstexte Standardtexte Richtzeiten Arbeitswerte. Descriptions of works, standards. EPC — spare parts catalogue. There are two types of WIS installation : Standalone and via EWA: WIS via … Continue reading Mercedes EWA WIS EPC installation software.