The maintenance of modern vehicles has transitioned from mechanical intuition to software-driven diagnostics. For Mercedes-Benz vehicles, the proprietary standard for this data is the WIS/ASRA system. WIS (Workshop Information System) provides service technicians with repair instructions, wiring diagrams, and torque specifications, while ASRA (Assembly/Repair Allocation) manages the administrative side of service, including labor time units (Arbeitswerte) and part allocation.
: Official access is provided through Mercedes-Benz B2B Connect for independent workshops and professionals. mercedes benz wis asra download new link