What Is Mercedes StarFinder? Mercedes StarFinder is an offline reference database developed by Mercedes-Benz AG that provides visual identification of ECU mounting positions, wiring harness routing, connector locations, and pin assignments across the full passenger car and van range. It operates independently of live vehicle communication — no interface hardware is required. Technicians use StarFinder at the workbench to plan diagnostic access, locate components before disassembly, and cross-reference connector pin-out data during electrical fault diagnosis. Primary use cases Locating an ECU or control unit before starting disassembly Identifying the correct connector and pin number for a measurement point Tracing wiring harness routing between components and across splices Identifying ground points, fuse boxes, and relay locations by chassis area Cross-referencing component positions with WIS/ASRA repair procedures StarFinder vs WIS/ASRA vs SW Finder — What Each Tool Does Before downloading, it is important to understand how StarFinder fits within the broader Mercedes workshop software suite. These three tools are frequently confused but serve entirely different purposes: Capability StarFinder WIS/ASRA SW Finder ECU location diagrams Yes — primary function No No Wiring diagrams Yes — detailed harness maps Partial No Workshop repair procedures No Yes — primary function No Software part numbers No No Yes — primary function Pin-out details Yes No No Offline use Yes Yes Yes Hardware required No No No For a complete workshop setup, StarFinder is used alongside WIS/ASRA (repair procedures) and Mercedes SW Finder (software part numbers). Each tool addresses a different stage of the diagnostic and repair workflow.