🏷️ Basic Information

Make:

Mercedes-Benz

Model:

S400

Year:

2010

Chassis Code:

W221

👋 Introduction

Positioning:

The 2010 Mercedes-Benz S400 Hybrid (W221) was positioned as a flagship luxury sedan with an emphasis on advanced technology, comfort, and fuel efficiency, representing a significant step in hybrid integration for the brand.

Competitors:

Competed with other large luxury sedans of the era, including the BMW 7 Series ActiveHybrid, Lexus LS 600h L, and Audi A8 Hybrid (though the latter was less prevalent in North America at this time). Its unique position was as one of the first mainstream luxury hybrids.

Vehicle Highlights:

Combines a potent V6 gasoline engine with an electric motor for enhanced performance and improved fuel economy. Features advanced driver assistance systems, luxurious interior appointments, and the sophisticated COMAND infotainment system.

Value Proposition:

Provides DIY enthusiasts and professional technicians with the official, authoritative source for maintaining and repairing the 2010 Mercedes-Benz S400 Hybrid, ensuring accuracy and efficiency.

📋 Manual Details

Engine:

3.5L V6 Hybrid (M272/ISG)

Transmission:

7G-TRONIC PLUS (722.9)

Systems:

Engine, transmission, brakes, suspension, steering, electrical, climate control, body, interior, infotainment, hybrid system, battery management, diagnostic procedures, wiring diagrams.

Estimated Pages:

3000+

Type:

Official Service and Repair Manual Software

Language:

English

Format:

Digital Software (likely PDF or proprietary executable)

📖 Manual Coverage

Engine Mechanical:

Detailed disassembly, assembly, inspection, and repair procedures for all engine components, including cylinder head, pistons, crankshaft, camshafts, valves, and oil pump.

Engine Management:

Diagnosis and repair of fuel injection, ignition, emissions control, cooling, and lubrication systems. Includes sensor data, actuator testing, and ECU mapping information.

Hybrid Powertrain:

Comprehensive coverage of the hybrid system, including the integrated starter generator (ISG), high-voltage battery pack, power electronics, hybrid control unit, and regenerative braking system. Specific procedures for battery handling and diagnostics.

Transmission Automatic:

Detailed overhaul, repair, and adjustment procedures for the 7G-TRONIC PLUS transmission, including torque converter, valve body, planetary gear sets, and shift solenoids. Fluid specifications and change intervals.

Brakes System:

Diagnosis and repair of hydraulic and electronic brake systems, including ABS, ESP, SBC (if applicable to early W221 variants, though less likely for S400 Hybrid), brake boosters, master cylinder, calipers, rotors, and brake fluid specifications.

Suspension Steering:

Repair and alignment procedures for front and rear suspension, including airmatic suspension (if equipped), control arms, shock absorbers, springs, power steering system, and steering rack.

Electrical Electronics:

Extensive coverage of the vehicle's complex electrical system, including detailed wiring diagrams for all circuits, fuse box locations, relay functions, component testing, and module diagnosis. Includes CAN bus communication protocols.

Body Interior:

Procedures for body panel removal and installation, door mechanisms, trim components, seats, airbags, seatbelts, and interior lighting.

Climate Control:

Diagnosis and repair of the automatic climate control system, including refrigerant handling, compressor, condenser, evaporator, and cabin filters.

Infotainment Navigation:

Troubleshooting and basic repair of the COMAND infotainment system, including navigation, audio, and communication modules.

Maintenance:

Step-by-step instructions for routine maintenance tasks such as oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, and belt inspections.

Troubleshooting:

Diagnostic flowcharts, symptom-based troubleshooting guides, and explanations of common fault codes (DTCs) with recommended repair actions.

Repair Rebuild:

Detailed procedures for component removal, installation, overhaul, and specialized repair techniques for nearly all vehicle systems.

Diagnostics:

Guidance on using diagnostic scan tools (e.g., STAR/XENTRY), interpreting diagnostic data, and performing actuator tests.

Electrical Troubleshooting:

Methodical approaches to diagnosing electrical faults using wiring diagrams, multimeters, and oscilloscopes. Includes fuse and relay testing.

Depth:

Comprehensive, covering everything from basic maintenance to complete engine and transmission rebuilds, advanced diagnostics, and detailed electrical system repair.

📊 Manual Specifications

Software Compatibility:

Requires a Windows-based operating system (specific version may vary).

Digital Clarity:

High-resolution digital images, diagrams, and text, ensuring clarity for printing or on-screen viewing.

Digital Format:

N/A (Digital Software)

Digital Medium:

N/A (Digital Software)

⚙️ Engine Specifications

Engine Code:

M272.984 (Gasoline V6)

Displacement:

3.5 Liters (3498 cc)

Configuration:

3.5L V6 with Integrated Starter Generator (ISG)

Gasoline Horsepower:

275 hp @ 6000 rpm

Gasoline Torque:

258 lb-ft @ 2400-5000 rpm

Electric Motor Power:

20 hp (15 kW)

Electric Motor Torque:

118 lb-ft (160 Nm)

Combined System Output:

System output figures are complex and depend on operating conditions, but generally refer to the synergistic output rather than a simple sum.

Induction:

Naturally Aspirated

Fuel Delivery:

Sequential Multi-Port Fuel Injection (MPI)

Fuel Type:

Premium Unleaded Gasoline (91+ octane recommended)

Type:

Liquid-Cooled

Type:

Lithium-ion

Voltage:

120V (nominal)

🔧 Transmission

Type:

7G-TRONIC PLUS Automatic Transmission

Gear Ratios:

Refer to manual for specific gear ratios (typically 4.375:1 first gear, 0.725:1 seventh gear).

Features:

Driver-adaptive shifting, manual mode (with paddle shifters), Sport and Comfort modes, lock-up torque converter.

Fluid Type:

MB-Approval 236.14 (e.g., Fuchs Titan ATF 4134, Mobil ATF 134)

Fluid Capacity:

Approximately 9.0 liters (check manual for exact dry/wet fill).

📐 Dimensions

Length:

206.5 inches (5245 mm)

Width:

73.7 inches (1872 mm)

Height:

59.3 inches (1506 mm)

Wheelbase:

124.6 inches (3165 mm)

Curb Weight:

Approx. 4500-4700 lbs (2041-2132 kg), varies with options.

🛡️ Safety Features

NHTSA Overall:

Likely received high safety ratings from NHTSA and IIHS, as is typical for the S-Class line. Specific 2010 ratings should be verified.

Active Safety Systems:

ABS, Traction Control (ASR), Electronic Stability Program (ESP), Adaptive Brake System, Brake Assist (BAS), PRE-SAFE® predictive occupant protection system.

Passive Safety Features:

Multiple airbags (front, side, curtain, knee), active head restraints, crumple zones, high-strength steel chassis.

💡 Technology Features

Infotainment System:

COMAND APS (Cockpit Management and Navigation Entertainment System) with HDD navigation, AM/FM/CD/DVD changer, Bluetooth connectivity, and auxiliary input.

Driver Assistance Features:

Adaptive Cruise Control (DISTRONIC PLUS), Lane Keeping Assist, Blind Spot Assist, Parking Assist (PARKTRONIC), Night View Assist (optional).

Connectivity Options:

Bluetooth hands-free calling and audio streaming, optional SiriusXM Satellite Radio.

Hybrid System Integration:

Seamless integration of the hybrid system, allowing for electric-only driving at low speeds, engine-off coasting, and power assist during acceleration. Regenerative braking captures energy.

🔧 Maintenance

Oil Change Interval:

Typically every 10,000 miles or 1 year, whichever comes first (refer to manual for exact SE.G.N.A.L. service intervals).

Major Service Intervals:

Includes spark plug replacement (approx. 60,000 miles), transmission fluid and filter change (check manual, often around 40,000-60,000 miles for optimal performance), coolant flush, brake fluid flush.

Engine Oil:

Mobil 1 Synthetic 0W-40 (MB-Approval 229.5)

Engine Oil Capacity:

8.5 liters (8.9 US quarts)

Coolant:

Mercedes-Benz G48 (Blue) Antifreeze/Coolant

Brake Fluid:

DOT 4 Plus (MB-Approval 331.0)

Common Wear Items:

Air suspension components (especially air springs and compressor), ignition coils, mass airflow sensors, fuel injectors, and occasional electronic module failures.

Hybrid Specific Concerns:

While generally robust, early hybrid systems can sometimes exhibit issues with battery cooling fans, power electronics, or sensors related to the hybrid control unit. Diagnosis requires specialized tools and knowledge.

📚 Vehicle History

Mercedes Benz Legacy:

Mercedes-Benz has a long-standing heritage of luxury, innovation, and safety, dating back to the invention of the automobile. The S-Class has consistently represented the pinnacle of their engineering and design.

S Class W221:

The W221 S-Class generation (2006-2013) introduced significant advancements in technology and design. The S400 Hybrid, launched in 2009 for the 2010 model year, marked a significant move towards electrification within the S-Class lineup.

Manufacturing Location:

Sindelfingen, Germany

🏆 Awards & Recognition

Industry Accolades:

While specific awards for the 2010 S400 Hybrid may be limited, the W221 S-Class generation consistently received accolades for its luxury, technology, and safety from various automotive publications and organizations.