Mercedes-Benz E-Class (W212) Repair Manual 2009-2013 PDF Wiring Diagrams

2009-2013 Index

General Information & Maintenance

• Comprehensive vehicle specifications, anti-lock brake safety precautions, basic troubleshooting, diagnostic trouble code (DTC) indexes (including OM642 diesel and M276 petrol engines), electrostatic discharge warnings, and emission applications.
• Maintenance reminder light reset procedures, OBD-II drive cycles, parasitic load test procedures, tire pressure monitor systems, traction control disable procedures, clutch troubleshooting, and wheel alignment theory and specifications.

Engine Mechanical Systems (Gasoline & Diesel)

• Complete engine overhaul procedures, compression and cylinder leakage testing, cylinder wall inspection, and firing order identification.
• Cylinder head removal/installation, valve service, valve seat machining, valve spring and stem seal replacement, and hydraulic valve clearance compensating elements.
• Crankcase, timing case covers, oil pans, dipstick guide tubes, connecting rods, pistons, piston rings, crankshafts, main bearings, Lanchester balancers, and flywheel/drive plate service.
• Belt drives, poly-V-belts, tensioning devices, engine mounts, and engine suspension.

Fuel, Mixture Formation, Turbocharging & Emission Control

• Common Rail Diesel Injection (CDI) systems, high-pressure pumps, quantity control valves, rails, fuel injectors, leak oil lines, and glow plug preglow systems.
• Air intake housings, intake port shutoff motors, mixing chambers, turbochargers, boost pressure control flaps, wastegate actuators, intercoolers, and charge air cooling circuits.
• Exhaust manifolds, exhaust gas recirculation (EGR) coolers and valves, AdBlue exhaust aftertreatment systems, diesel particulate filters (DPF), and oxygen/temperature/pressure sensors.
• Fuel tanks, fuel pumps, fuel filters, water separators, suction jet pumps, and EVAP/purge control systems.

Transmission & Drivetrain Systems

• Automatic transmission service, transmission fluid level checks, fluid/filter changes, fluid cooler service, and electrohydraulic controller units (valve bodies).
• Transmission electrical components, fully integrated transmission control units (VGS), selector lever modules (ESM), park pawl mechanisms, and shift rod adjustments.
• Propeller shaft service, flex disks, intermediate bearings, centering sleeves, and propeller shaft alignment using electronic inclinometers.

Suspension, Steering & Wheel Alignment

• Steel spring suspension, torsion bars, stabilizer bars, and air suspension (Airmatic) systems, valve units, compressors, and central reservoirs.
• Shock absorbers, damper struts, front axle carriers, control arms, torque struts, wheel hubs, wheel bearings, steering knuckles, and rear axle center assemblies.
• Wheel balancing, tire care, Tirefit sealant procedures, tire pressure monitoring systems (TPMS / RDK / RDW), and comprehensive chassis alignment and accident measurement specifications.

Braking Systems (Hydraulic, Pneumatic, ABS, ESP & Adaptive Brake)

• Service brake maintenance, brake disc and pad inspection, brake bleeding procedures, master cylinders, brake hoses, and parking brake adjustment.
• Anti-lock Braking Systems (ABS), traction regulation (ASR), Electronic Stability Program (ESP), Adaptive Brake (ABR) systems, yaw rate sensors, and wheel speed sensors.
• Pneumatic brake units, vacuum pumps, and vacuum brake boosters.

Steering Systems (Hydraulic, Electric & Speed-Sensitive)

• Steering wheels, steering column tubes, electronic ignition locks (EIS/EZS), electronic steering locks, and steering couplings.
• Rack-and-pinion steering gears, power steering pumps, fluid level checks, bleeding procedures, and power steering radiators.
• Electric Power Steering (EPS) systems and Speed-Sensitive Power Steering (SPS / PML) actuators.

Bodywork, Doors, Roof & Interior Equipment

• Underbody paneling, frame floors, front ends, firewalls, wheelhouses, side walls, pillars (A, B, C), rear fenders, rear walls, and roof paneling/frames.
• Front and rear doors, door modules, door locks, window regulators, and crank windows.
• Electric sliding sunroofs, panoramic glass roofs, roller sun blinds, and windshield/rear window bonding and replacement procedures.
• Instrument panels, center consoles, glove boxes, interior trim parts, door sills, and upholstery care.

Electrical System, Battery Management & Driver Assistance

• On-board electrical system power supply, 12V batteries, auxiliary batteries, battery sensors, battery management control units, DC-AC converters, and ECO Start/Stop energy management.
• Front and rear SAM control units with integrated fuse and relay boxes, front pre-fuse boxes, trunk fuse boxes, and wiring harness routing and repair guidelines.
• Instrument clusters, comfort displays, electronic overhead control panels, switch modules, fanfare horns, and exterior/interior lighting systems (including Intelligent Light System, Adaptive Highbeam Assist, and LED headlamps).
• Advanced driver assistance systems including Attention Assist, Night View Assist, Speed Limit Assist, Parktronic (PTS), reversing/360° cameras, Active Lane Keeping Assist, and Blind Spot Assist.

Heating, Ventilation, Infotainment & Telematics

• Automatic air conditioning (AAC / Thermotronic), blowers, evaporator sensors, and heater control valves.
• Windshield wipers, washer fluid systems, rain/light sensors, and headlamp cleaning systems (HCS).
• Cockpit Management and Data System (COMAND), navigation units, DVD players, digital audio broadcasting (DAB), satellite radio (SDAR), TV tuners, media interfaces, antenna amplifier modules, sound amplifiers, and emergency call systems (Tele Aid / E-Call / VCS).

Electrical Wiring Diagrams (EWD) — W212 (2.1L Turbo Diesel, 4.6L Turbo & 3.5L Variants)

• Factory electrical schematics and circuit diagrams covering model years 2009 through 2013 across Sedan, Wagon, Coupe, and Convertible body styles.
• Comprehensive system coverage including air conditioning, anti-lock brakes, anti-theft alarms, body control modules, computer data lines, cooling fans, cruise control, defoggers, electronic power steering, and electronic suspension.
• Engine performance circuits tailored for 2.1L Turbo Diesel, 4.6L Turbo, and 3.5L engine configurations.
• Exterior and interior lighting, ground and power distribution, headlights, horns, instrument clusters, memory systems, navigation, power door locks, power mirrors, power seats, power top/sunroof, and power windows.
• Radio and sound amplifier wiring, shift interlocks, starting and charging systems, supplemental restraint systems (SRS / airbags), transmission circuits, trunk/tailgate/fuel door releases, warning systems, and wiper/washer circuits.

The Cost of Diagnostic Guesswork

Driveline vibrations on modern executive sedans are rarely just a simple wheel balance issue. When you are dealing with the W212 chassis, a slight deviation in the propeller shaft intermediate bearing can trigger harmonic resonances that confuse the automatic transmission's electronic control sensors.

The 2009-2013 E-Class marries heavy-duty mechanical engineering with hyper-sensitive multiplexed networking. Attempting to overhaul the timing chain drive on the M276 V6 without the exact camshaft adjustment procedures is a recipe for catastrophic valve-to-piston contact. Furthermore, an incorrect torque sequence on the timing case cover can restrict internal oil flow to the cam adjusters, setting off MED17.7 DTCs that point to an electrical sensor failure when the real problem is physical oil starvation. This document delivers the mandatory mechanical clearance tolerances to keep your repairs accurate.

Workshop Systems Integration

One frequent diagnostic mistake is ignoring the physical condition of the rear engine mounts when attempting to resolve harsh shifting in the automatic transmission. The transmission control module calculates shift line pressures based on assumed, perfectly aligned driveline geometry.

This PDF provides the exact instructions for measuring absolute angles at the transmission and rear axle housing using an electronic propeller shaft inclinometer. If the mechanical alignment sags due to a collapsed mount, the valve body solenoids will overcompensate, creating a harsh engagement that feels exactly like a failing internal conductor plate. By following the provided gear tooth contact patterns and absolute angle metrics, you prevent misdiagnosing expensive electrical transmission faults caused by basic mechanical wear.

Advanced Bay Troubleshooting

Navigating this massive 7,397-page technical document allows you to trace complex faults from the mechanical symptom back to the digital root cause:

• Turbocharging & Emission Control: For the 2.1L OM651 diesel, mechanical soot accumulation in the Exhaust Gas Recirculation (EGR) valve or AdBlue after-treatment system directly impacts the Hot Film Mass Air Flow sensor readings, throwing the CD16 engine management into limp mode.
• Air Suspension Calibration: Replacing damper struts or pneumatic brake units requires more than physical parts-swapping. The suspension ride height must be perfectly calibrated so the Adaptive Brake (ABR) and Traction Regulation (ASR) systems receive accurate wheel travel data from the chassis measurement sensors.
• Parasitic Draw Isolation: Modern Mercedes platforms are notoriously difficult to diagnose for battery drains. Use the dedicated "Parasitic Load Explanation and Test Procedures" alongside the factory wiring harnesses and CAN-bus diagrams to isolate sleeping control units without blindly pulling fuses.

Digital Reference Utility

• Searchable OCR: Instantly locate torque specifications or wiring diagrams by searching for specific components like the "MED17.7" module or "Keyless-Go-Entry".
• Visual Clarity: Zoom capability allows you to trace dense electrical pinouts and complex frame floor welding locations on any shop tablet or monitor.
• Comprehensive Coverage: Covers all variations of the W212, from routine brake pad replacement to extensive accident repair involving rear longitudinal member sectioning.

Guaranteed Shop Floor Access

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Frequently Asked Questions

How do I correctly measure the driveline angles if I'm replacing the flex disks on the propeller shaft?
The manual includes highly specific procedures for setting up and utilizing the electronic propeller shaft inclinometer. It details exactly how to measure the absolute angle at the transmission and correct the center inclination angle at the intermediate bearing to prevent inducing harmonic vibrations into the chassis.

Will this technical document cover the wiring for the panoramic roof and driver assistance systems?
Absolutely. The electrical system body section provides complete tear-down and diagnostic routines for the Lane Assist cameras, Parking Assist sonar, and the electrical motors/switches for both the standard electric sliding roof and the panoramic variant.

Does the troubleshooting section break down the AdBlue exhaust after-treatment for the OM651 diesel?
Yes, the emission control modules extensively cover the OM651 diesel platform. You will find mechanical replacement steps for the AdBlue injectors as well as diagnostic routines for the exhaust gas recirculation (EGR) valves, turbocharger charge air pipe, and emission sensor feedback loops.

In real-world repair scenarios, can this manual help me isolate a persistent battery drain?
Definitely. The document contains a specific section titled "Parasitic Load Explanation and Test Procedures." Instead of guessing, you can follow the factory flowchart to measure voltage drops across the fuse and relay boxes, identifying exactly which Basic Module or control unit is refusing to enter sleep mode.