Mercedes-Benz C300 4Matic 2008 - 2008 MERCEDES-BENZ C300, C350 & C63 AMG

Mercedes-Benz C300 4Matic 2008 - BUZZERS, RELAYS & TIMERS

Mercedes-Benz C300 4Matic 2008 BUZZERS, RELAYS & TIMERS LOCATION

Component	Location
Backup Relays (L & Q)	On front SAM control module with fuse & relay module. See Fig. 2.
Circuit 50 Starter Relay (M)	On front SAM control module with fuse & relay module. See Fig. 2.
Circuit 87 Relay (Chassis) (R)	On front SAM control module with fuse & relay module. See Fig. 2.
Circuit 87 Relay (Engine) (N)	On front SAM control module with fuse & relay module. See Fig. 2.
Fanfare Horn Relay (O)	On front SAM control module with fuse & relay module. See Fig. 2.
Fuel Pump Relay (D)	On rear SAM control module with fuse & relay module. See Fig. 3.
Heated Rear Window Relay (C)	On rear SAM control module with fuse & relay module. See Fig. 3.
Seat Adjustment Relay (F)	On rear SAM control module with fuse & relay module. See Fig. 3.
Seat Adjustment Relay 15R (G)	On rear SAM control module with fuse & relay module. See Fig. 3.
Secondary Air Injection Relay (P)	On front SAM control module with fuse & relay module. See Fig. 2.
Terminal 15 Relay (Front) (J)	On front SAM control module with fuse & relay module. See Fig. 2.
Terminal 15 Relay (Rear) (A)	On rear SAM control module with fuse & relay module. See Fig. 3.
Terminal 15R Relay (Front) (K)	On front SAM control module with fuse & relay module. See Fig. 2.
Terminal 15R Relay (Rear) (B)	On rear SAM control module with fuse & relay module. See Fig. 3.

Mercedes-Benz C300 4Matic 2008 - CIRCUIT PROTECTION DEVICES

Mercedes-Benz C300 4Matic 2008 CIRCUIT PROTECTION DEVICES LOCATION

Component	Location
Driver/Front Passenger Overvoltage Protection Diode	In respective front seat back. See Fig. 107.
Front Electrical Prefuse Box	At right rear of engine compartment. See Fig. 1.
Front SAM Control Unit W/Fuse & Relay Module	Left rear of engine compartment. See Fig. 1.
Interior Fuse Box	Behind left end of dash. See Fig. 1.
Rear Prefuse Box	Right side of luggage compartment. See Fig. 1.
Rear SAM Control Unit W/Fuse & Relay Module	Left side of trunk/cargo area. See Fig. 1.

Mercedes-Benz C300 4Matic 2008 - CONTROL UNITS

Mercedes-Benz C300 4Matic 2008 CONTROL UNITS LOCATION

Component	Location
Blower Regulator	On bottom of blower motor. See Fig. 38.
Electric Steering Lock Control Unit	Top of steering column. See Fig. 86.
Electronic Selector Lever Module Control Module	Under center console. See Fig. 85.
Electronic Stability Program Control Unit	Left front of engine compartment. See Fig. 87.
Emergency Call System Control Unit	Center front of trunk. See Fig. 96.
Fuel Pump Control Module	Under right rear seat. See Fig. 93.
Left Fuel Pump Control Unit	Under right rear seat. See Fig. 94.
ME-SFI (ME) Control Module	Top center of engine. See Fig. 84.
Panoramic Sliding Roof Control Module	Left front of roof. See Fig. 42.
Right Fuel Pump Control Unit (N118/4)	Right side of trunk. See Fig. 95.
Satellite Digital Audio Radio (SDAR) Control Unit	Center front of trunk. See Fig. 90.
Sound System Amplifier Control Unit	Left side of trunk. See Fig. 88.
Steering Column Module Control Unit	Top of steering column. See Fig. 89.
Steering Wheel Gear Shift Signal Processing Module	Inside steering wheel.
Supplemental Restraint System Control Unit	Under front of center console. See Fig. 83.
Tire Pressure Monitor Control Unit	Left side of trunk. See Fig. 91.
Weight Sensing System (WSS) Control Unit	Under front passenger's seat. See Fig. 92.
Xenon Headlight Control Module (Left/Right)	Behind respective headlight.
Xenon Headlight Ignition Module (Left/Right)	Behind respective headlight.

Mercedes-Benz C300 4Matic 2008 - MOTORS

Mercedes-Benz C300 4Matic 2008 MOTORS LOCATION

Component	Location
Actuator Motor (Throttle Valve Actuator)	Part of throttle valve actuator.
Air Distribution Flap Actuator Motor	Lower left side of heater system air circulation unit. See Fig. 78.
Air Pump	Top front of engine. See Fig. 82.
Blower Motor	Under right side of dash.
Defroster Vent Flap Actuator Motor	Upper left side of heater system air circulation unit. See Fig. 74.
Fresh Air/Recirculated Air Flap Actuator Motor	Right side of heater system air circulation unit. See Fig. 72.
Fuel Pump (FP) (M3)	In top of fuel tank. See Fig. 46.
Headlamp Cleaning System Pump	In left front wheelwell, on washer fluid reservoir.
High-Pressure & Return Pump	Integral to traction system hydraulic unit. See Fig. 35.
Instrument Cluster & Audio/COMAND Display Fan Motor	Under left side of dash. See Fig. 75.
Left Blending Air Flap Actuator (M2/6)	Left side of heater system air circulation unit. See Fig. 73.
Left/Right Front Power Window Motor	Center of respective front door.
Left/Right Headlight Range Adjustment Motor	Behind respective headlight assembly.
Left/Right Rear Power Window Motor	Center of respective rear door.
Mirror Adjustment Motor (In/Out) (Left/Right)	In respective door mirror.
Mirror Adjustment Motor (Up/Down) (Left/Right)	In respective door mirror.
Oil Cooler Fan Motor	Behind right side of front bumper.
Panoramic Sliding Roof Motor	Integral to panoramic sliding roof control module. See Fig. 42.
Rear Window Roller Sun Blind Motor	Center of hat shelf.
Right Blending Air Flap Actuator (M2/7)	Right side of heater system air circulation unit. See Fig. 73.
Seat Backrest Inclination Adjustment Motor (Driver)	In driver's seat back.
Seat Backrest Inclination Adjustment Motor (Front Passenger)	In front passenger's seat back.
Seat Fore/Aft Adjustment Motor (Driver)	Under driver's seat.
Seat Fore/Aft Adjustment Motor (Front Passenger)	Under front passenger's seat. See Fig. 79.
Seat Height Adjustment Motor (Driver)	Under driver's seat.
Seat Height Adjustment Motor (Front Passenger)	Under front passenger's seat. See Fig. 80.
Seat Inclination Adjustment Motor (Driver)	Under driver's seat.
Seat Inclination Adjustment Motor (Front Passenger)	Under front passenger's seat. See Fig. 81.
Starter	Right rear of engine.
Tank Cap Central Locking Motor	Right side of trunk.
Throttle Valve Actuator (Front/Rear M16/3, M16/4)	In air intake manifold. See Fig. 77.
Tilting/Sliding Roof Motor	Integral to tilting/sliding roof drive unit. See Fig. 76.
Trunk Lid Central Locking Motor	Center rear of trunk lid.
Windshield Washer System Pump	In left front wheelwell, on washer fluid reservoir.
Wiper Motor	At left rear of engine compartment.

Mercedes-Benz C300 4Matic 2008 - SENDING UNITS & SENSORS

Mercedes-Benz C300 4Matic 2008 SENDING UNITS & SENSORS LOCATION

Component	Location
Accelerator Pedal Sensor	Top of accelerator pedal assembly.
Actual Value Potentiometer (Sliding Contact 1)	Part of throttle valve actuator.
Actual Value Potentiometer (Sliding Contact 2)	Part of throttle valve actuator.
Air Outlet Temperature Sensor (Left)	Behind left side of dash. See Fig. 53.
Air Outlet Temperature Sensor (Left Front Footwell)	Behind left side of dash. See Fig. 55.
Air Outlet Temperature Sensor (Right)	Behind right side of dash. See Fig. 54.
Air Outlet Temperature Sensor (Right Front Footwell)	Behind right side of dash. See Fig. 56.
Battery Sensor	On battery.
Belt Tension Sensor	On right "B" pillar, in passenger's seat belt anchor.
Brightness Sensor	Inside instrument cluster.
Coolant Temperature Sensor	Left rear of engine. See Fig. 57.
Crankshaft Hall Sensor	Left rear of engine. See Fig. 69.
Drive Actual Value Potentiometer	Part of throttle valve actuator.
Evaporator Temperature Sensor	Under right side of dash. See Fig. 52.
Exhaust Camshaft Hall Sensor (Left)	Front of left cylinder bank. See Fig. 50.
Exhaust Camshaft Hall Sensor (Right)	Front of right cylinder bank. See Fig. 51.
Frontal Acceleration Sensor (Left)	Behind left side of front bumper. See Fig. 65.
Frontal Acceleration Sensor (Right)	Behind right side of front bumper. See Fig. 66.
Front Axle Brake Pressure Sensor	Integral to traction system hydraulic unit. See Fig. 35.
Front Door Pressure Sensor (Left/Right)	Bottom center of respective front door. See Fig. 68.
Front Pressure Sensor	Integral to traction system hydraulic unit. See Fig. 35.
Fuel Level Indicator Sensor (Left) (B4/1)	In fuel tank. See Fig. 46.
Fuel Level Indicator Sensor (Right) (B4/2)	In fuel tank. See Fig. 46.
Fuel Pressure Sensor (B4/7)	In fuel tank. See Fig. 46.
Fuel Tank Pressure Sensor	In fuel tank. See Fig. 47.
Hall Sensor 1 (Panoramic Sliding Roof)	Integral to panoramic sliding roof control module. See Fig. 42.
Hall Sensor 2 (Panoramic Sliding Roof)	Integral to panoramic sliding roof control module. See Fig. 42.
Hot Film MAF Sensor	Top rear of engine. See Fig. 44.
Hot Film MAF Sensor (Left/Right) (Left Shown)	At respective top rear side of engine. See Fig. 45.
Hot Film MAF Sensor (Right)	Top right rear of engine.
Intake Air Temperature Sensor	Part of hot film MAF sensor. See Fig. 44.
Intake Camshaft Hall Sensor (Left)	Front of left cylinder bank. See Fig. 48.
Intake Camshaft Hall Sensor (Right)	Front of right cylinder bank. See Fig. 49.
Intake Manifold Tumble Flap Position Sensor (Left)	Left rear of engine. See Fig. 63.
Intake Manifold Tumble Flap Position Sensor (Right)	Right rear of engine. See Fig. 64.
Interior Temperature Sensor	In dash, right of steering column.
Left Knock Sensor No. 2	Between cylinder banks. See Fig. 37.
Left O2 Sensor (Downstream Of Catalytic Converter)	Under left front of vehicle, in exhaust.
Left O2 Sensor (Upstream Of Catalytic Converter)	Under left front of vehicle, in exhaust.
Level Sensor (Left Front)	In left front wheelwell. See Fig. 60.
Level Sensor (Left Rear)	In left rear wheelwell. See Fig. 59.
Oil Temperature Sensor	Lower left front of engine. See Fig. 43.
Outside Temperature Sensor	Under center of front fascia.
Pressure Sensor	Left front of engine. See Fig. 62.
Rain/Light Sensor	Top center of windshield.
Rear Pressure Sensor	Integral to traction system hydraulic unit. See Fig. 35.
Refrigerant Pressure Sensor	At bottom left side of radiator condenser. See Fig. 58.
Right Front Brake Pad Wear Sensor	At right front brake assembly.
Right Fuel Level Sensor (B4/2)	In fuel tank. See Fig. 46.
Right Knock Sensor No. 1	Between cylinder banks. See Fig. 36.
Right O2 Sensor (Downstream Of Catalytic Converter)	Under right front of vehicle, in exhaust.
Right O2 Sensor (Upstream Of Catalytic Converter)	Under right front of vehicle, in exhaust.
Right Rear Brake Pad Wear Sensor	At right rear brake assembly.
Seat Occupied Recognition Pressure Sensor	Bottom of right front seat. See Fig. 67.
Side Airbag Sensor (Left)	Base of left "B" pillar. See Fig. 39.
Side Airbag Sensor (Right)	Base of right "B" pillar. See Fig. 40.
Steering Angle Sensor	Part of steering column module. See Fig. 89.
Sun Sensor	Top center of dash.
Throttle Valve Actual Value Potentiometer	Part of throttle valve actuator.
Tilting/Sliding Roof Hall Sensor 1	Integral to tilting/sliding roof drive unit. See Fig. 76.
Tilting/Sliding Roof Hall Sensor 2	Integral to tilting/sliding roof drive unit. See Fig. 76.
Tire Pressure Sensors (4)	In respective front/rear wheels. See Fig. 41.
Wheel Speed (RPM) Sensor (Left/Right Front)	On respective front steering knuckle assembly. See Fig. 70.
Wheel Speed (RPM) Sensor (Left/Right Rear)	On respective rear wheel hub assembly. See Fig. 71.
Yaw Rate, Lateral & Longitudinal Acceleration Sensor	Under driver's seat. See Fig. 61.

Mercedes-Benz C300 4Matic 2008 - SOLENOIDS & SOLENOID VALVES

Mercedes-Benz C300 4Matic 2008 SOLENOIDS & SOLENOID VALVES LOCATION

Component	Location
Front Axle Intake Ball Valve	Integral to traction system hydraulic unit. See Fig. 35.
Front Axle Switchover Valve	Integral to traction system hydraulic unit. See Fig. 35.
Left Front Pressure Regulator Valve (Pressure Hold)	Integral to traction system hydraulic unit. See Fig. 35.
Left Front Pressure Regulator Valve (Pressure Release)	Integral to traction system hydraulic unit. See Fig. 35.
Left Rear Pressure Regulator Valve (Pressure Hold)	Integral to traction system hydraulic unit. See Fig. 35.
Left Rear Pressure Regulator Valve (Pressure Release)	Integral to traction system hydraulic unit. See Fig. 35.
Left/Right High Beam Solenoid	In respective headlight assembly.
Rear Axle Intake Ball Valve	Integral to traction system hydraulic unit. See Fig. 35.
Rear Axle Switchover Valve	Integral to traction system hydraulic unit. See Fig. 35.
Right Front Pressure Regulator Valve (Pressure Hold)	Integral to traction system hydraulic unit. See Fig. 35.
Right Front Pressure Regulator Valve (Pressure Release)	Integral to traction system hydraulic unit. See Fig. 35.
Right Rear Pressure Regulator Valve (Pressure Hold)	Integral to traction system hydraulic unit. See Fig. 35.
Right Rear Pressure Regulator Valve (Pressure Release)	Integral to traction system hydraulic unit. See Fig. 35.

Mercedes-Benz C300 4Matic 2008 - SWITCHES

Mercedes-Benz C300 4Matic 2008 SWITCHES LOCATION

Component	Location
Back-Up Lamp Switch (M/T)	On right rear of transmission. See Fig. 102.
Brake Fluid Level Switch	In brake fluid reservoir.
Coolant Level Switch	Right front of engine compartment. See Fig. 104.
Engine Hood Anti-Theft Alarm System Switch	Left front of engine compartment. See Fig. 106.
Oil Level Switch	Left side of oil pan. See Fig. 105.
Parking Brake Indicator Switch	On parking brake support bracket.
Rear Backrest Inclination Switch (Left/Right)	Inside respective rear seat backrest.
Rear Backrest Lock Switch (Left/Right)	Behind respective rear seat.
Seat Belt Buckle Restraint Systems Switch (Driver)	In driver's seat belt buckle.
Seat Belt Buckle Restraint Systems Switch (Passenger)	In front passenger's seat belt buckle.
Start Enable Clutch Pedal Switch	Top of clutch pedal assembly. See Fig. 103.
Stop Lamp Switch	Under left side of dash. See Fig. 101.
Trunk Lid Contact Switch	In trunk lid latch assembly.
Windshield Washer Fluid Level Switch	Left front wheelwell, in washer bottle.

Mercedes-Benz C300 4Matic 2008 - MISCELLANEOUS

Mercedes-Benz C300 4Matic 2008 MISCELLANEOUS LOCATION

Component	Location
Alarm Siren	Rear of right front wheelwell.
Cylinder 1 Ignition Coil	Top right side of engine.
Cylinder 2 Ignition Coil	Top right side of engine.
Cylinder 3 Ignition Coil	Top right side of engine.
Cylinder 4 Ignition Coil	Top left side of engine.
Cylinder 5 Ignition Coil	Top left side of engine.
Cylinder 6 Ignition Coil	Top left side of engine.
Diagnostic Connector (DLC)	Under left side of dash. See Fig. 25.
Driver Airbag Squib 1	In steering wheel.
Driver Airbag Squib 2	In steering wheel.
Electrolytic Capacitor 1 (Rear Window Noise Suppressor)	In left "C" pillar.
Electrolytic Capacitor 2 (Rear Window Noise Suppressor)	In right "C" pillar.
Emergency Call System Antenna	Center of hat shelf.
Emergency Tensioning Retractor Squib (Left Rear)	In left "C" pillar.
Emergency Tensioning Retractor Squib (Right Rear)	In right "C" pillar.
ETR (GUS) Ignition Squib (Driver)	At base of left "B" pillar. See Fig. 97.
ETR (GUS) Squib (Front Passenger)	At base of right "B" pillar. See Fig. 97.
Fanfare Horns (Left Right)	Behind respective side of front bumper.
FM, AM & CL Antenna Amplifier	Center front of roof.
Front Door Infrared Remote Control Receiver (Driver Side)	In driver's outside door handle.
Front Passenger Air Bag Ignition Squib 1	Behind right side of dash. See Fig. 98.
Front Passenger Air Bag Ignition Squib 2	Behind right side of dash. See Fig. 99.
Global Positioning System Antenna Splitter	Right front of trunk. See Fig. 34.
Radio Interference Suppression Capacitor 1	Top right side of engine.
Radio Interference Suppression Capacitor 2	Top left side of engine.
Rear Window Antenna Amplifier 1	Center rear of roof.
Rear Window Antenna FM Antenna Amplifier	Base of left "C" pillar.
Side Airbag Ignition Squib (Right)	Right side of front passenger's seat back.
Side Airbag Squib (Driver)	Left side of driver's seat back.
Window Airbag Ignition Squib (Left)	Left rear of roof. See Fig. 100.
Window Airbag Ignition Squib (Right)	Right rear of roof. See Fig. 100.

Mercedes-Benz C300 4Matic 2008 - CONNECTORS

Mercedes-Benz C300 4Matic 2008 CONNECTORS LOCATION

Component	Location
X35/1 (4 Pin)	Front of driver's door. See Fig. 26.
X35/2 (4 Pin)	Front of right front door. See Fig. 27.
X35/3 (24 Pin)	In left "B" pillar. See Fig. 28.
X35/4 (24 Pin)	In right "B" pillar. See Fig. 29.
X55/3 (14 Pin)	Under driver's seat. See Fig. 30.
X55/4 (14 Pin)	Under right front seat. See Fig. 31.
X62/6 (4 Pin)	Right front wheelwell. See Fig. 32.
X62/7 (4 Pin)	Left front wheelwell. See Fig. 33.

Mercedes-Benz C300 4Matic 2008 - GROUNDS

Mercedes-Benz C300 4Matic 2008 GROUNDS LOCATION

Component	Location
W7	Right side of trunk. See Fig. 4.
W7/1	Right side of trunk. See Fig. 5.
W9	In left front wheelwell. See Fig. 6.
W10	Near battery. See Fig. 7.
W11	Right front of engine. See Fig. 8.
W11w1	Right rear of engine. See Fig. 10.
W11w2	Left rear of engine. See Fig. 11.
W11/1	Left front of engine. See Fig. 9.
W15/5	Left front footwell. See Fig. 12.
W15/6	Left front footwell. See Fig. 13.
W15/7	Right front footwell. See Fig. 14.
W15/8	Right front footwell. See Fig. 15.
W16/3	Left side of engine compartment. See Fig. 16.
W16/4	Right side of engine compartment. See Fig. 17.
W16/5	Left rear of engine compartment. See Fig. 18.
W18	Under driver's seat. See Fig. 19.
W18/3	Under driver's seat. See Fig. 20.
W19	Under right front seat. See Fig. 21.
W26	Under front of center console. See Fig. 22.
W70	Left front of engine compartment. See Fig. 23.
W76	Under right rear seat. See Fig. 24.

Mercedes-Benz C300 4Matic 2008 - SPLICES

Mercedes-Benz C300 4Matic 2008 SPLICES LOCATION

Component	Location
Z5	Top right side of engine.
Z5z2	Top right side of engine.
Z6/1	Right side of trunk.
Z6/3	Right rear of engine compartment.
Z6/15	Under center console.
Z6/26	Top right side of engine.
Z6/27	Top right front of engine.
Z6/30z1	Right front of engine.
Z6/30z2	Top left front of engine.
Z6/48	Right rear of engine compartment.
Z6/48z1	Top right side of engine.
Z6/48z2	Top left rear of engine.
Z6/85	Behind center of dash.
Z6/94	Under driver's seat.
Z6/95	Under right front seat.
Z7/21	Under center of dash.
Z7/35z1	Top right side of engine.
Z7/35z2	Top left side of engine.
Z7/35z3	Top left rear of engine.
Z7/35z4	Top right rear of engine.
Z7/36	Right rear of engine compartment.
Z7/36z1	Top right side of engine.
Z7/36z2	Top left side of engine.
Z7/38z1	Top right side of engine.
Z7/38z2	Top right side of engine.
Z7/43	Top right side of engine.
Z7/44	Top rear of engine.
Z7/61	Right rear of engine compartment.
Z7/98z1	To right side of engine.
Z7/98z2	Left rear of engine.
Z7/98z3	Right rear of engine compartment.
Z35/10	In left rear door sill.
Z36/5	Left rear of engine compartment, in module box.
Z36/6	Left rear of engine compartment, in module box.
Z50/1	Behind left side of dash.
Z50/3	Behind left end of dash.
Z61/18	In bottom of driver's seat.
Z61/19	In bottom of right front seat.
Z68/1	Behind left side of dash.
Z68/2	Behind left side of dash.
Z68/10	Behind left side of dash.
Z80z1	Right side of trunk.
Z81	Under driver's seat.
Z84/1	Top front of engine.
Z84/2	Top front of engine.
Z209/2	In right "C" pillar.