Smart Fortwo (451) — figures & diagrams

2,204 illustrations, schematics, exploded views, and procedure photos for the Smart Fortwo (451), pulled from the workshop and owner manuals. Pick a system to narrow down, or open any figure for its source manual page, part references, and a copyable link.

System: Body & Interior 789 Electrical 540 Chassis 401 Powertrain 220 EV-specific 142 HVAC & Comfort 81
Title page showing smart fortwo 451 introduction manual with cutaway vehicle diagrams on blue background. 451Exploded view Smart fortwo 451 model series introduction and cutaway Body · p1 Two cutaway diagrams of smart fortwo 451 models displaying internal systems and layout. 451Exploded view Smart fortwo 451 coupe and cabrio cutaway views showing Engine · p9 Instrument cluster with orange multifunction display showing maintenance service information and wrench symbols. 451Location callout Maintenance interval display (WIA) in instrument cluster ECU / sensors · p15 Engine bay diagram of orange Smart fortwo with six numbered callouts identifying maintenance points. 451 Smart fortwo 451 front end maintenance points including Brakes · p16 Labeled engine bay photo showing four numbered maintenance access points in smart fortwo 451 engine compartment. 451Location callout Engine compartment maintenance points for smart fortwo 451 Engine · p17 Interior view of smart fortwo with numbered callouts identifying driver airbag, passenger airbag, and head/thoraxbag locations. 451 Safety concept for smart fortwo 451, showing passive safety ECU / sensors · p19 Battery and fuse components in Smart fortwo 451 passenger footwell with labeled callouts F36, F58, F91, G1. 451 On-board electrical system/power supply: battery location Fuses & relays · p21 Alternator component photo labeled G2, instrument cluster display labeled A1, and alternator charge warning lamp A1e5. 451 Alternator and instrument cluster power supply monitoring ECU / sensors · p22 Diagram of red Smart car with labeled electrical components N23, B38, N49, N110, N3/10, A15p4, B32, H3/2, N25/5, N57/2, and others positioned on vehicle. 451Schematic Complete electrical system network showing component ECU / sensors · p23 Electrical system network diagram with CAN and LIN bus connections between seven control modules and their sub-units. 451Wiring diagram Complete networking diagram showing CAN bus/LIN bus ECU / sensors · p24 Transparent vehicle diagram showing four color-coded wiring harness routes throughout smart fortwo 451 chassis. 451Wiring diagram Smart ForTwo 451 wiring harness groups layout with four Wiring · p25 Service manual page showing wiring harness repair kit information and product image with part numbers. 451Wiring diagram Wiring harness repair kits and procedures for Smart Fortwo Wiring · p26 Photo showing diagnostic connector X11/4 mounted under dashboard on driver side of smart fortwo 451. 451 Data link connector X11/4 location on chassis 451 under ECU / sensors · p27 Front view of SAM control unit showing fuse and relay locations labeled numerically. 451 SAM control unit front panel layout with numbered fuse Fuses & relays · p29 Rear view of SAM control unit showing fuses, relays, and connector terminals for smart fortwo 451. 451Exploded view SAM control unit rear view with integrated fuse and relay Fuses & relays · p30 Cutaway view of M132 three-cylinder gasoline engine showing internal components and layout. 451Exploded view Engine M132 3-cylinder gasoline engine with 999 cm³ Engine · p31 Numbered exploded view diagram of engine valve assembly with 11 labeled parts and descriptive text. 451Exploded view Valve assembly exploded diagram showing timing chain Engine · p34 Exploded view of M132 engine cylinder head showing valve timing components, camshafts, and cup tappets with 12 numbered callouts. 451Exploded view Engine M132 valve timing components with mechanical cup Engine · p35 Engine M132 gasoline injection ignition system schematic showing sensors, actuators, and control modules interconnected. 451Schematic Gasoline injection and ignition system data flow chart for Engine · p37 Engine block front view showing belt drive pulleys and tensioning components with numbered callouts 1-8. 451Exploded view Belt drive system with eight labeled components: alternator Engine · p39 Cooling system schematic with numbered components: radiator, expansion reservoir, coolant pump, thermostat, and heater exchanger. 451Schematic Smart fortwo 451 cooling system circuit diagram showing Engine · p40 Engine bay diagram and close-up photos of cooling system components including reservoir and hose clamp. 451 Cooling system bleeding procedure for smart fortwo 451 Cooling · p41 Exploded view diagram of engine mounting system showing frame support, engine mount, transmission mount, and torque support with magnified detail views. 451Exploded view Engine mount, transmission mount, and torque support Engine · p42 Exploded view of fuel system with seven numbered components and labeled part codes. 451Exploded view Fuel supply system components for 451 chassis, showing Fuel system · p45 Labeled diagram of exhaust system components including manifold, converter, muffler, and sensor locations. 451Exploded view Exhaust system overview for smart fortwo 451 showing Exhaust · p46 Engine diagram showing secondary air injection pump M33, switchover valve Y32, hoses, and cylinder head with numbered callouts. 451Location callout Secondary air injection system components and operation on Engine · p47 Cutaway technical illustration of AMT 2 transmission assembly with gears and control mechanisms visible. 451Exploded view 5-speed automated manual transmission (AMT 2) for smart Transmission · p48 Exploded diagram of shift mechanism showing motors M17/3 and M17/4, selector drums, shift forks, and input shaft. 451Exploded view Shift mechanism design with selector drums, electric Transmission · p50 Technical diagram of transmission shift mechanism with selector drums and sliding block positions for neutral and reverse. 451Schematic Shift mechanism function and selector drum positions for Transmission · p51 Shift mechanism components with selector drums, sliding blocks, and gear engagement diagrams. 451Exploded view Shift mechanism selector drums and sliding blocks for Transmission · p52 Technical diagram of shift mechanism with selector drums, sliding blocks, and shift position grid squares labeled a-d. 451Schematic Shift mechanism for 3rd and 4th gear in smart fortwo 451 Transmission · p53 Technical diagram of transmission shift mechanism showing selector drums and sliding blocks for gear selection. 451Exploded view Shift mechanism for 5th gear with selector drum positions Transmission · p54 Exploded technical diagram of transmission synchronizer components with four numbered callouts. 451Exploded view Borg-Warner synchronization system for forward gears in Transmission · p55 Transmission RPM sensor mounted on transmission housing; oscilloscope waveform showing sensor output signal 451Schematic Transmission RPM sensor (L2) location on transmission Transmission · p56 Labeled diagram of two transmission control motors mounted on transmission selector drums 451Exploded view Transmission motors M17/3 and M17/4 selector drum assembly Transmission · p57 N15/6 control unit shown mounted below driver seat with exploded view diagram and technical specifications. 451 Automated manual transmission control unit N15/6 location Transmission · p58 Diagram of electronic selector lever showing P, R, N, D, M positions with unlock button and shift mechanics. 451Location callout Electronic selector lever module control unit (N15/5) Transmission · p59 Instrument cluster showing gear range display and multifunction display for transmission control modes. 451Location callout Transmission control modes displayed on instrument cluster Transmission · p60 Transmission control system schematic showing N47-5, N3/10, N10/10, N15/5, N15/6 modules and sensors connected via CAN bus. 451Wiring diagram Automated manual transmission control data flow chart for Transmission · p61 Park pawl mechanism photos showing transmission, cable, and control switch installation points. 451Location callout Mechanical park pawl assembly with electronic selector Transmission · p62 Exploded view of clutch pressure plate, clutch plate, and flywheel with numbered callouts. 451Exploded view Single-plate dry clutch assembly for model 451 with Transmission · p63 Exploded view of clutch motor assembly showing electric motor, clutch motor M18, actuating plunger, and electric motor connector. 451Exploded view Smart 451 clutch motor assembly with electric actuator, M18 Transmission · p64 Labeled diagram of front axle suspension components for smart fortwo 451 with six numbered callouts. 451Exploded view Front axle assembly with McPherson suspension design on Suspension · p65 Exploded diagram of smart fortwo rear axle assembly with numbered callout labels 7-13. 451Exploded view Rear axle assembly with suspension components, chassis 451 Suspension · p66 Lowered rear drive module of smart fortwo 451 with engine and drivetrain components visible 451 Rear module lowered on chassis 451, showing engine Suspension · p67 Smart fortwo 451 tire pressure monitor system diagram showing instrument cluster, wheel sensors, SAM control unit, and cockpit switch. 451Schematic Tire pressure monitor system components and locations on Wheels & tires · p69 Exploded brake system diagram of orange Smart car showing numbered components from pedal to wheels. 451Exploded view Smart fortwo 451 brake system components with eight Brakes · p71 Exploded view diagram of brake pedal module with labeled parts 9-20 and S9/1. 451Exploded view Brake pedal module assembly with 12 numbered callouts Brakes · p72 ESP brake system schematic with numbered callouts showing control modules, sensors, and CAN bus connections 451Schematic Electronic Stability Program ESP data flow chart showing Brakes · p75 Exploded view of electric power steering system showing steering column, wheel, and EPS motor assembly. 451Exploded view Electric power steering EPS system with rack-and-pinion Steering · p76 Exploded diagram of EPS motor, control unit, and steering gear assembly with numbered callouts. 451Exploded view Electric power steering (EPS) system design and components Steering · p77 Exploded diagram of steering torque sensor and power steering motor assembly with seven numbered callout labels. 451Exploded view Electric power steering (EPS) torque sensor and motor Steering · p78 Schematic diagram of steering system components connected via CAN bus network. 451Wiring diagram Electric power steering EPS data flow chart showing CAN bus Steering · p80 Two steering wheel designs for smart fortwo 451: standard two-spoke leather wheel and three-spoke sport wheel with paddle shifters. 451 Steering wheel variants for 451 chassis: two-spoke leather Steering · p81 Exploded view of steering wheel assembly showing wheel rim, hub, and internal contact unit with callout detail. 451Exploded view Steering wheel removal and installation components for Steering · p82 Smart fortwo 451 interior with red upholstery, instrument panel, and door details visible. 451 Interior design of smart fortwo 451 showing red and black Body · p83 Smart fortwo 451 instrument panel with steering wheel, gauges, center console, and air vents in orange and black trim. 451 Instrument panel design featuring ergonomics, clear layout Body · p84 Interior instrument cluster description and multifunction display with orange screen showing speed, odometer, and temperature readings. 451 Instrument cluster and multifunction display functions for ECU / sensors · p85 Labeled instrument cluster showing gauges, indicator lamps, and display functions with 26 callout references. 451Location callout Instrument cluster callout diagram with speedometer Wiring · p86 Door structure diagram showing carrier module, diagonal strut, window frame, and crossmember; emergency lock cylinder on driver door. 451 Smart Fortwo 451 side doors and emergency opening structure Doors · p87 Exploded diagram of driver door showing carrier module, hinges, struts, window mechanism, and mirror motor. 451Exploded view Smart Fortwo 451 driver door assembly with power window and Doors · p88 Exploded diagram of rear-end door assembly with 14 numbered callouts and component labels. 451Exploded view Smart Fortwo 451 rear-end door exploded view showing Doors · p89 Two photos showing emergency door unlock procedures: coupe method uses wire through tab hole; cabrio uses screwdriver through drilled holes. 451Location callout Emergency unlocking procedures for smart fortwo rear-end Doors · p90 Three overhead views of Smart Fortwo 451 showing different roof types: fixed PU roof, panoramic sunroof, and convertible soft top. 451 Smart Fortwo 451 roof system variants: PU, polycarbonate Cabrio roof · p91 Service manual page describing roof systems for smart fortwo 451 with photo of panoramic sunroof interior. 451 Hard roofs and panoramic sunroof options for smart fortwo Cabrio roof · p92 Exploded diagram of Tritop convertible roof system with three labeled parts on black fabric top. 451Exploded view Tritop fabric soft top components for smart fortwo cabrio Cabrio roof · p93 Smart key with red button and interior power soft top switch labeled S84. 451 Soft top operation controls: transmitter key with folding Cabrio roof · p94 Smart Fortwo 451 with open targa roof showing folding mechanism and control systems. 451 Roof systems overview showing targa roof position, soft top Fuses & relays · p95 Schematic diagram showing soft top motor, relays, switches, and control unit connections for convertible roof operation. 451Wiring diagram Soft top roof control system data flow chart with CAN bus ECU / sensors · p96 Central locking overview and transmitter key with four labeled buttons for door and fuel flap control. 451Location callout Central locking system with transmitter key functions Doors · p97 Wiring diagram of central locking system with numbered components and signal flow paths. 451Wiring diagram Central locking system schematic for smart fortwo 451 Body · p99 System diagram showing ATA alarm components, control unit N10/10, sensors, and signal flows via CAN and LIN C networks. 451Wiring diagram Anti-theft alarm system (ATA [EDW]) data flow chart for ECU / sensors · p101 Windshield rain sensor and combination switch AUTO position for automatic headlight control 451 Auto on/off headlamps Autolight function with rain/light ECU / sensors · p102 Two dashboard radio units shown with buttons, displays, and controls for Smart fortwo 451 model. 451 Audio system radio variants for Smart fortwo 451: smart Body · p103 Two overhead car diagrams showing speaker positions labeled A2/1, A2/2, H4/9, H4/10, H4/29, H4/33, H4/34 for basic and enhanced audio systems. 451Exploded view Audio system speaker sound variants and installation Body · p104 Dashboard diagram showing air outlet locations with arrows indicating airflow distribution points. 451 Climate control heating and air conditioning system for HVAC · p105 Climate control section with operating unit photo and system notes for smart fortwo model 451. 451 Climate control system operation including air HVAC · p106 Exploded view diagram of smart fortwo body panels and crash management system components with 18 numbered parts. 451Exploded view Customized Bodypanel System (CBS) components for smart Body · p108 Interior photo of fortwo 451 showing front seats with heating elements installed in bolster and backrest. 451 Seats general adjustment and seat heater operation for HVAC · p109 Diagram showing seat cushion frame, pressure sensor, and WSS control unit components labeled N110 and B48/4. 451Location callout Weight sensing system components for supplemental restraint ECU / sensors · p111 Wiring diagram of supplemental restraint system components connected via CAN bus network. 451Wiring diagram Supplemental restraint system data flow chart for smart ECU / sensors · p112 Two exploded body diagrams showing metal frame and composite panels for fortwo coupe and cabrio models. 451Exploded view Bodyshell materials overview comparing smart fortwo coupé Body · p115 Technical diagram showing front and rear crash management steel profiles on red smart fortwo vehicle. 451Exploded view Crash management system (CMS) concept and front/rear steel Body · p116 SAM unit with wiring harnesses and relay modules visible under steering column 451 SAM module with colored relay connections under steering Fuses & relays · p1 Wiring schematic of Smart 451 SAM unit with ignition wire positions and remote-activated switch relay diagram. 451Wiring diagram Smart 451 SAM unit wiring diagram for remote start Engine · p2 Amazon product pages showing wireless relay control switch and car immobilizer bypass module with specifications and pricing. 451 RF relay module and transponder bypass module product ECU / sensors · p3 Smart fortwo electric drive 451 on street with green trim and electric drive badge visible. 451 Introduction of smart fortwo electric drive 3rd generation High-voltage system · p1 Smart fortwo ED coupe and cabrio exterior views, plus electric motor and battery assembly in engine bay. 451 Third generation smart fortwo electric drive overview with High-voltage system · p9 Cutaway view of smart fortwo electric vehicle displaying high-voltage battery pack, electric motor, and transmission. 451Exploded view Electric drive system layout of smart fortwo electric drive High-voltage system · p10 Cutaway diagram of smart fortwo electric drive showing electric motor, high-voltage battery, drivetrain, and thermal systems with 16 labeled callouts. 451Exploded view Model 451 smart fortwo electric drive overview with 16 High-voltage system · p11 Engine bay diagram showing brake fluid, washer fluid, coolant reservoirs, lamp unit, and EV battery desiccant cartridge. 451 Front engine bay maintenance items and high-voltage battery High-voltage system · p16 Yellow warning label with electrical hazard symbols and safety icons for high-voltage system. 451 On-board electrical system safety warnings including High-voltage system · p18 Undercarriage diagram of electric smart car with labeled high-voltage components including motor, battery, and chargers. 451Exploded view High-voltage components layout on smart fortwo electric High-voltage system · p21 Electrical system schematic diagram with high-voltage (orange) and low-voltage (blue) circuit paths connecting battery, motor, chargers, and control units. 451Schematic High-voltage and 12V electrical system topology for smart High-voltage system · p22 Exploded view of high-voltage battery module showing coolant lines, connectors, desiccant cartridge, and vent hose connections. 451Exploded view High-voltage battery module components and connections for High-voltage system · p25 On-board charger assembly with labeled coolant lines, high-voltage connections, and CAN connector ports. 451Exploded view On-board charger 3 kW location, connections, and component High-voltage system · p33 Screenshots of Vehicle Homepage login screen and smartphone app showing battery charge level and range information. 451 Smart fortwo electric drive Vehicle Homepage app interface High-voltage system · p37 EV charging socket diagram showing 7-pin connector and contact labels for high-voltage and control signals. 451Location callout Charger feed-in socket X58/23 location, pin configuration High-voltage system · p38 Electrical schematic of charger socket with connector pins and indicator lamp meanings during EV charging. 451Schematic Charger feed-in socket X58/23 block diagram and indicator High-voltage system · p39 Charger socket diagram showing pin layout, photo, and block diagram with contact assignments. 451Schematic X58/23 charger feed-in socket schematic with 5-pin High-voltage system · p40 Numbered diagram of EV charging cable components in vehicle liftgate storage area 451Location callout Charging cable stowage compartment in liftgate, showing EV-specific · p41 Dashboard display showing charging progress indicator with numbered callouts for connector, progress, and duration. 451Location callout EV charging cable display on A1p13 multifunction screen High-voltage system · p42 Exploded view of electric drive system showing transmission, motor, fuse box, and power electronics control unit. 451Exploded view Power electronics control unit components for electric High-voltage system · p44 Exploded view of high-voltage adapter plate fuse box showing yellow cables, connectors, and internal components labeled 1-8. 451Exploded view High-voltage adapter plate fuse box F34/6 assembly with High-voltage system · p45 Schematic diagram of high-voltage fuse box with numbered fuses 1-3 and labeled component connections. 451Schematic High-voltage adapter plate fuse box block diagram showing High-voltage system · p46 Electric refrigerant compressor component with four labeled connection points and technical specifications. 451Location callout Electric refrigerant compressor A9/6 with high-voltage High-voltage system · p47 PTC heater unit with numbered callouts identifying air conditioner housing, high-voltage connection, and electrical system connector. 451Exploded view High-voltage PTC heater assembly mounted in HVAC housing High-voltage system · p48 Wiring diagram of high-voltage interlock system with components labeled A9/6, M5, N129/1, N83, N33/5, N82/2, G5, S7, F19, X26. 451Wiring diagram High-voltage interlock system topology for Smart fortwo High-voltage system · p50 Service Disconnect plug and SAM control unit location diagram with callouts S7 and N10/10. 451 High-voltage system deenergization procedure and Service High-voltage system · p51 German diagnostic forms for high-voltage system procedures on 451 smart fortwo EV 451 High-voltage network disconnection and operation protocol High-voltage system · p52 Diagram of smart car electrical system with labeled components A1, N2/1, N127, N83, and others positioned throughout vehicle. 451Wiring diagram Overall electrical network layout for smart fortwo electric High-voltage system · p56 Electrical system network diagram with colored boxes representing control units connected by communication bus lines. 451Wiring diagram Overall network block diagram showing CAN V, CAN C, and LIN High-voltage system · p57 Data link connector X11/4 mounted under dashboard on driver side 451 X11/4 data link connector location on driver side ECU / sensors · p58 Front and rear photographs of SAM control unit showing fuses, relays, and connectors. 451 SAM control unit front and back views with fuse locations Fuses & relays · p59 Diagram showing relay positions on smart car electrical system with labeled callouts. 451 SAM control unit relay locations and arrangement on smart Fuses & relays · p63 Diagram showing brake vacuum pump, sensors, and relay positions on electric fortwo. 451Exploded view Brake system vacuum pump and sensor locations on smart Brakes · p64 Sound generator component mounted on white smart fortwo electric vehicle front end 451 H4/16 electric vehicle sound generator mounted under front EV-specific · p65 Exploded view diagram of electric drive system showing transmission, motor, and power electronics control unit with labeled callouts. 451Exploded view Smart fortwo electric drive motor description with labeled High-voltage system · p66 Exploded view of electric transmission components showing motor, transmission, selector lever, and park pawl cable assembly. 451Exploded view Smart Fortwo electric drive transmission assembly with EV-specific · p67 Exploded view of front axle crossmember with numbered callouts showing battery support strut attachment. 451Exploded view Front axle crossmember and high-voltage battery supporting High-voltage system · p68

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