W639 Workshop Manual

Mercedes-Benz W639 (Vito & Viano) Workshop Manual: The Essential Technical Reference

3.6. Electrical & Electronics (Group 54+80)

• Complete fuse box allocation diagrams (engine bay, under driver seat, footwell).
• CAN-B network topology (interior CAN, drivetrain CAN, diagnostic CAN).
• SAM (Signal Acquisition Module) control unit codes – replacing without dealer programming.
• Retrofitting cruise control or heated seats (pinout and coding steps).

4. Body and Interior

• Sliding door mechanism: The W639 sliding door is a mechanical marvel. The manual includes cable adjustment and roller replacement.
• Heater blower resistor: A common failure. The manual shows its location under the glovebox and the resistance values to test.

3. Electrical Architecture

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).

1. It’s Not Just a Haynes Manual

Many casual DIYers are satisfied with a generic owner’s handbook or a generic aftermarket guide. But the W639 is a complex piece of German engineering. A proper Workshop Manual (WIS) is what the Mercedes dealership technicians use.

It doesn't just tell you what to do; it tells you exactly how to do it according to factory standards. We are talking about: w639 workshop manual

• Exact torque specifications for every bolt.
• Special tools required (and how to fabricate them if you don't have them).
• Fluid capacities and viscosity grades.
• Detailed wiring diagrams.

2. The 722.6 and 722.9 Transmissions

The W639 uses the 5-speed 722.6 and later the 7-speed 722.9. The workshop manual must cover:

• Conductor plate replacement (722.6).
• Fully integrated transmission control (722.9) – no dipstick tube.
• The exact fill procedure (which requires a scan tool to read transmission fluid temperature at 40°C-45°C).

Introduction

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. Mercedes-Benz W639 (Vito & Viano) Workshop Manual: The

1. The Mercedes-Benz WIS (Workshop Information System)

This is the official factory manual. Mercedes-Benz does not print paper manuals for this generation. Instead, they use the WIS/ASRA system. This is a software-based database containing:

• Step-by-step removal and installation procedures.
• Tightening torques for every single bolt (crucial for aluminum engines).
• Wiring diagrams with color-coded circuits.
• Diagnostic trouble code (DTC) trees.
• Special tool numbers.

Pros: Absolute accuracy. If Mercedes built it, the WIS tells you how to fix it.
Cons: Expensive ($500+ for short-term subscriptions). Complex interface. Requires Windows OS. Complete fuse box allocation diagrams (engine bay, under

Problem 2: Diesel Particulate Filter Regeneration

You cannot force a regeneration without the correct service manual steps. The workshop manual details:

1. Checking the soot load via live data.
2. The exact driving conditions required for passive regeneration.
3. The scan tool menu path to activate "Service Regeneration."