Manual | W639 Workshop

This is where most W639 owners surrender. The manual must include a full circuit diagram key. You need to understand the difference between a "Circuit 30" (constant live), "Circuit 15" (ignition live), and "Circuit 31" (ground). Without wiring diagrams, you will never fix a short in the rear SAM (Signal Acquisition Module).

The Mercedes-Benz W639, produced between 2003 and 2014, represents a pivotal generation of mid-size vans and MPVs, encompassing the utilitarian Vito (panel van/combi) and the luxurious Viano (people carrier). Unlike its predecessor (W638, co-developed with VW), the W639 is a true Mercedes-Benz chassis, sharing its platform and engineering with the Sprinter 906.

Maintaining these complex vehicles—featuring advanced diesel injection (CDI 2.0, 2.2, 3.0 V6), electronic stability programs, and multi-layered CAN-bus networks—requires more than a generic handbook. The Workshop Manual (also known as the Service Manual or WIS document set) is the definitive engineering guide produced by Daimler AG for dealerships and independent specialists.

The Mercedes-Benz Sprinter W639, produced from 2006 to 2013, is a versatile and widely used van known for its reliability and robust performance. The workshop manual for this model is an essential tool for mechanics and technicians, providing detailed instructions and specifications for maintenance, repair, and troubleshooting. w639 workshop manual

Critical note: The W639 shares mechanicals with the VW LT3 (only the very similar Dodge Sprinter? No – correction: The W639 is not a Sprinter; the Sprinter is W901–W905. Do not confuse them.)

Some early W639 Vianos used Sensotronic Brake Control (SBC). When the SBC pump runs too often, the system shuts down. The manual provides the reset procedure and the safety lockout for bleeding the brakes (requires a Star Diagnosis system to cycle the pump).

In Mercedes WIS, procedures have codes like "AR27.10-P-1000A". The first two digits are the system group (27 = engine), and the last four indicate the specific job. If you buy a third-party manual, ensure these codes are intact. This is where most W639 owners surrender

Best single source for most owners:
Buy the Haynes manual #6345 (print) + supplement with a free Russian-sourced WIS printout for your specific engine code.

If you own a Marco Polo camper:
Add the Marco Polo specific supplement (rare) – otherwise use Viano mechanical sections + separate camper electrics guide.

If you own a Vito with OM642 V6 diesel:
You need the official WIS for oil cooler seal replacement – aftermarket manuals misrepresent the procedure. Critical note: The W639 shares mechanicals with the

| Source | Format | Pros | Cons | |--------|--------|------|------| | Mercedes-Benz Xentry WIS | Online subscription / DVD | 100% accurate, all TSBs, part numbers weekly updated | Expensive ($1000+/year), dealer-only access for live data | | Bentley Publishers | Printed book | High-quality, edited for DIY logic | Rare for W639 (only C/E/S-class focus) | | eManualOnline / Tradebit | PDF (500–3000 pages) | Affordable ($15–40), searchable text, includes wiring diagrams | Variable quality – look for genuine Mercedes reprints (with Daimler copyright) | | Auto-repair manuals (Haynes) | Printed | Cheap, good for basics | Lacks ECU pinouts, adaptation procedures, transmission overhaul details |

Recommendation: For professional repair, use a genuine Mercedes WIS PDF dump (circa 2012–2014) or an all-makes subscription like ALLDATA or AutoData. For DIY, a high-resolution scanned copy of the Mercedes “W639 Service Information” (3,500+ pages) is essential.