Electrical figures — Smart Fortwo (451)

540 electrical illustrations for the Smart Fortwo (451) — schematics, exploded views, and procedure photos drawn from the manuals. Open any figure for its source page, part references, and a copyable link.

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 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 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 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 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 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 SAM unit with wiring harnesses and relay modules visible under steering column 451 SAM module with colored relay connections under steering Fuses & relays · p1 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 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 Smart ForTwo with open door showing four safety and maintenance accessories with part numbers. 451 Smart ForTwo accessories including battery charger Battery (12V) · p16 Rear view of black smart car with red accents showing third brake light, roof spoiler, and diffuser details. 451 Smart ForTwo 451/453 rear styling accessories including Lighting · p20 Interior cabin photo with three numbered airbag locations and comprehensive passive safety system description text. 451Location callout Smart Fortwo 451 passive safety concept and interior airbag ECU / sensors · p19 Battery and fuse box location diagram for smart fortwo 451 with labeled components 451 On-board electrical system components including battery Fuses & relays · p21 Alternator component and instrument cluster display showing charge monitoring and warning lamp systems. 451 Alternator and instrument cluster monitoring the on-board ECU / sensors · p22 Diagram showing electrical component locations on red Smart Fortwo with callout labels for sensors and modules. 451Schematic Complete networking electrical system component locations ECU / sensors · p23 Electrical network diagram with seven blue modules connected to CAN bus, pink module on CAN-B, and multiple control units connected via LIN C and LIN B buses. 451Wiring diagram CAN bus and LIN bus network schematic showing control ECU / sensors · p24 Transparent side view of Smart Fortwo 451 with color-coded wiring harness routing and four numbered callout locations. 451Wiring diagram Smart Fortwo 451 wiring harness groups overview showing Wiring · p25 Text page explaining wiring harness variants, repair procedures, and photo of wiring harness repair kit in case. 451Wiring diagram Wiring harnesses overview with repair kit information and Wiring · p26 Photograph showing data link connector X11/4 mounted under dashboard on driver side of smart fortwo 451. 451 Data link connector location X11/4 under instrument panel ECU / sensors · p27 Rear view of SAM control unit with fuses and relays, red and yellow components visible 451 SAM control unit rear view showing fuse and relay box Fuses & relays · p30 Technical documentation of instrument cluster components and multifunction display with orange LCD screen showing vehicle data. 451Location callout Instrument cluster and multifunction display operation for ECU / sensors · p85 Technical diagram of convertible roof systems showing targa position and soft top control mechanisms 451 Roof systems targa position and soft top control operation Fuses & relays · p95 Schematic diagram of convertible roof system components and their connections via CAN bus network. 451Wiring diagram Soft-top control data flow chart for smart fortwo 451 Fuses & relays · p96 Schematic diagram of ATA EDW anti-theft alarm system with numbered components and signal flow paths. 451Wiring diagram Anti-theft alarm system (ATA EDW) data flow chart for Smart ECU / sensors · p101 Autolight function diagram showing rain sensor B38 on windshield and combination switch S4 in AUTO position. 451 Exterior lights auto on/off headlamps Autolight function ECU / sensors · p102 Two dashboard radio units showing smart radio 9 and smart radio 10 variants for model 451. 451 Audio system radio variants for smart fortwo 451: smart Lighting · p103 Two overhead car diagrams showing speaker placement: basic package with front speakers, and sound system with tweeters and subwoofer. 451 Audio system speaker locations and components for smart Lighting · p104 Diagram of seat cushion frame with silicone oil-filled mat and WSS pressure sensor, plus overhead view of seat frame components. 451Location callout Weight Sensing System (WSS) components for passenger seat ECU / sensors · p111 Schematic diagram showing airbag system components, sensors, and CAN bus wiring connections. 451Wiring diagram Supplemental restraint system data flow chart for Smart ECU / sensors · p112 Dashboard center console with labeled controls and two tables listing function descriptions 451Location callout Upper center console controls and switches with 12 numbered Lighting · p10 Overhead panel showing three numbered controls: airbag lamp, lighting switch, and interior mirror. 451Location callout Overhead control panel with passenger airbag indicator Lighting · p13 Battery maintenance procedure with labeled components and hazard warnings for Smart Fortwo 451 451 Battery checking and fluid level procedure for Smart Fortwo Battery (12V) · p4 Two-part page showing maintenance procedures table and ground cable identification photo for Smart Fortwo 451 models. 451 Service procedures table and battery ground line Wiring · p7 Technical diagram showing battery components and removal steps for left-hand drive vehicle 451Exploded view Battery removal and installation procedure for Smart Fortwo Battery (12V) · p9 Pliers tool, dashboard interior view, and engine bay battery component with text instructions for electrical diagnostic testing. 451Location callout Pliers identification and quiescent current consumption Wiring · p12 Diagnostic tester device with coiled cable, clip connectors, and menu screen showing test selection options. 451 Battery voltage tester with clips and menu selection for ECU / sensors · p16 Display menu screens showing battery capacity and type selection options with navigation arrows. 451 Battery selection menu displays for capacity and type Battery (12V) · p17 Flowchart showing battery test menu options and cold cranking amp test results interpretation. 451Schematic Battery cold cranking amps testing menu selection flowchart Battery (12V) · p18 Display test result flowchart showing battery standard selection and diagnostic outcomes. 451 Cold cranking amps test result display options for multiple Battery (12V) · p19 Two flowchart diagrams showing menu navigation for battery test modes based on temperature and charge conditions. 451Schematic Battery test mode selection flowcharts for temperature Battery (12V) · p20 Service table showing battery inspection steps, hazard warnings, and part numbers for Smart 451 model. 451Location callout Battery condition check procedure for Smart ForTwo model Battery (12V) · p21 Three vehicle interior photos showing fuse locations, plus service procedure tables with numbered steps. 451Location callout Secondary air injection pump fuse location and Fuses & relays · p23 Three photographs showing SAM prefuse location and soft top relay components with numbered callouts and removal steps. 451 SAM prefuse location and removal procedure for chassis Fuses & relays · p24 Technical service procedures showing soft top relay access, SAM fuse box locations, and battery cable disconnection. 451 SAM fuses replacement procedure and battery cable Fuses & relays · p25 Two technical diagrams showing battery location and electrical line connections with numbered callouts. 451Location callout Battery components identification and removal/installation Wiring · p26 Service procedure table and diagram showing wiring harness offset measurement and solder connector repair steps. 451Wiring diagram Wiring harness routing and axial solder connector repair Wiring · p29 Technical diagrams showing cable insulation measurements and steps for pushing and twisting axial solder connectors. 451Location callout Cable insulation dimensions and axial solder connector Wiring · p30 Diagram showing correct and incorrect solder joint positions, plus method for wrapping repaired cable area with fabric tape. 451Location callout Solder joint identification and cable wrapping repair Wiring · p32 Six black and white photos showing SAM control unit location and wiring, with table listing removal steps. 451Exploded view Front SAM control unit component locations and removal Fuses & relays · p37 Service procedures for temperature sensor and horn removal with numbered steps and component identification diagrams. 451Location callout Outside temperature sensor (B14) removal/installation and ECU / sensors · p46 Safety warning symbols and text for lead-acid battery handling including fire, caustic, and poisoning hazards. 451 Warning instructions and safety symbols for handling Battery (12V) · p49 Battery safety warnings, first aid instructions, and dashboard retrofit procedure with three numbered steps showing cover removal and cutout. 451 Lead-gel battery safety procedures, first aid measures for Battery (12V) · p50 Exploded view and installation photos of additional instrument cluster components for smart fortwo 451. 451Exploded view Model 451.3/4 parts scope for additional instrument (A15) ECU / sensors · p52 Two photos showing SAM control unit location under hood and interior fuse box, plus reference table with part numbers. 451 SAM control unit location and fuse/relay box assignments Fuses & relays · p57 Fuse box diagrams showing front and back SAM control unit with labeled fuse positions and electrical connectors. 451Location callout SAM control unit fuse sockets and electrical connectors Fuses & relays · p58 Diagram showing SAM control unit fuse box with relay positions A, B, C and their functions labeled. 451 Fuse and relay box relay assignment GF54.15-P-1255-21MCU Fuses & relays · p62 SAM control unit mounted in passenger footwell; fuse table and location photographs shown. 451 SAM control unit location, fuse specifications, and Fuses & relays · p63 Diagram showing rain and light sensor placement inside windshield below rearview mirror 451 Rain/light sensor location on Smart Fortwo 451.3/4 mounted ECU / sensors · p66 Diagrams showing rain sensor function with infrared transmitter and receiver detecting windshield wetness. 451Schematic Rain sensor infrared light reflection principle on dry and ECU / sensors · p67 Data link connector in footwell and cockpit switch group diagram with numbered callouts. 451Location callout Data link connector location in driver-side footwell and ECU / sensors · p68 Instrument cluster diagram showing speedometer and warning lamp locations with labeled callouts A1 through A1p13. 451Wiring diagram Instrument cluster layout and component identification for ECU / sensors · p69 Wiring diagram showing instrument cluster function and connections to various vehicle control modules via CAN-bus network. 451Wiring diagram Instrument cluster CAN-bus network schematic with control ECU / sensors · p70 Speedometer diagram showing warning lamp locations labeled A1e1 through A1e3C. 451Location callout Instrument cluster indicator and warning lamp locations for Lighting · p73 Instrument cluster speedometer showing speed display gauge and electronic components labeled A1 and A1e4. 451Location callout Instrument cluster electronic speedometer display speed ECU / sensors · p78 Speedometer gauge and digital display showing vehicle speed measurement via ESP control unit and CAN bus. 451Wiring diagram Electronic speedometer operation and wheel speed signal ECU / sensors · p79 Instrument cluster diagram showing speedometer, warning lamps, and indicator lights with labeled callout points. 451Location callout Instrument cluster components with numbered callouts ECU / sensors · p83 Wiring diagram showing data link connector pins and electrical components with reference table. 451Wiring diagram Data Link Connector diagnostic socket wiring diagram for ECU / sensors · p86 Two wiring diagram pages with circuits, connectors, and electrical pathways for vehicle electrical systems. 451Wiring diagram Electrical Center wiring diagram pages 1 and 2 of 5 showing Wiring · p89 Complex wiring diagram with relays, connectors, and circuit lines for vehicle electrical system. 451Wiring diagram Electrical Center wiring diagram showing relay circuits and Fuses & relays · p90 Wiring diagram with relay modules U1001, U14, and component connections labeled with part codes. 451Wiring diagram Electrical center wiring diagram part 5 of 5 showing relay ECU / sensors · p91 Two-part electrical center wiring schematic with relays, fuses, and module interconnections. 451Wiring diagram Electrical Center wiring diagram showing relay circuits and Wiring · p96 Two complex wiring diagrams labeled Fig. 76 and Fig. 77 showing electrical center circuits with numbered connections and dashed routing lines. 451Wiring diagram Electrical center wiring diagrams 3 and 4 of 5, showing Wiring · p97 Complex wiring schematic with relay modules, fuse connections, and component designations labeled. 451Wiring diagram Electrical center wiring diagram showing fuses, relays, and Fuses & relays · p98 Two-part wiring diagram for electrical center with component connections and circuit paths labeled with reference numbers. 451Wiring diagram Electrical center wiring diagrams showing circuits and ECU / sensors · p102 Two pages of electrical center wiring diagrams with numbered components and circuit lines. 451Wiring diagram Electrical Center wiring diagrams showing circuit ECU / sensors · p103 Wiring diagram with numbered callouts, component designations, and electrical connections for radios and headlamps. 451Wiring diagram Electrical center wiring diagram page 5 of 5 showing smart ECU / sensors · p104 Two complex wiring diagrams with numbered circuits, connectors, and electrical components labeled. 451Wiring diagram Electrical Center wiring diagram pages 1-2 of 5 showing Wiring · p107 Two wiring diagram pages labeled Fig. 86 and Fig. 87 with circuit schematics and numbered connection points. 451Wiring diagram Electrical Center wiring diagram sheets 3 and 4 of 5 Wiring · p108 Wiring schematic with three control modules U1001, U1000, U14 connected by signal lines labeled 0/5 02DE. 451Wiring diagram Electrical center wiring diagram for 451 chassis, page 5 of ECU / sensors · p109 Two wiring schematics for instrument cluster with labeled components, connectors, and circuit paths. 451Wiring diagram Large instrument cluster wiring diagram parts 1 and 2 of 3 Wiring · p114 Technical wiring schematic for smart fortwo 451 instrument cluster with circuit paths and connector assignments 451Wiring diagram Instrument cluster wiring diagram part 3 of 3 for chassis Wiring · p115 Wiring schematic of auxiliary dashboard instruments for Smart Fortwo 451 model with component positions and connector details. 451Wiring diagram Auxiliary instruments wiring diagram for 451 chassis ECU / sensors · p116 Technical specification page showing 126-pin socket box tool and adapter line parts for electrical testing. 451 Special tools for electrical system diagnosis: 126-pin ECU / sensors · p118 Three diagnostic tool illustrations: connection kit case, hot air blower gun, measuring resistor component. 451 Electrical connection kit, hot air blower, and measuring ECU / sensors · p120 Technical diagram showing resistor component and probe tool with part numbers for smart fortwo models. 451 Precision resistor and probe measuring tools for chassis ECU / sensors · p121 Two diagnostic probes and a diagnostic case with decade resistor shown in technical drawings. 451 Diagnostic probe and cable set with measuring resistor for ECU / sensors · p122 Battery tester with leads and pliers tool for 12V socket removal shown in technical drawings. 451 Battery tester tool (450 589 15 21 00) and socket pliers Battery (12V) · p123 Two views of Smart fortwo 451 with numbered callouts (1-12) marking exterior features and components. 451Location callout Smart fortwo 451 exterior view with twelve numbered callout Lighting · p22 Instrument cluster with analog speedometer gauge and digital LCD display showing odometer reading 18000 km, temperature 22°C. 451Location callout Instrument cluster speedometer and digital display with Lighting · p28 Diagram showing air bag locations in steering wheel and dashboard with numbered callouts. 451Location callout Head-thorax and front air bag deployment locations, driver ECU / sensors · p41 Overhead panel photo showing passenger air bag off indicator lamp and test procedure for occupant detection system. 451 Passenger front air bag off indicator lamp location on ECU / sensors · p44 Key fob with panic alarm button labeled, activation and deactivation instructions. 451Location callout Panic alarm key fob activation and deactivation procedures ECU / sensors · p48 Manual page showing anti-theft system controls and procedures with dashboard image and numbered callouts. 451 Anti-theft system operation, arming, disarming, and ECU / sensors · p52 Dashboard switch callouts showing anti-theft system activation steps with indicator lamp 451Location callout Anti-theft system activation procedure using dashboard ECU / sensors · p53 Starter switch dial showing three positions labeled 0, 1, and 2 for ignition control. 451Location callout Starter switch positions with numbered dial settings for Wiring · p61 Page 66 showing seat belt safety instructions and exterior lamp switch diagram with USA positions. 451 Exterior lamp switch positions and proper seat belt usage Lighting · p68 Lighting control switch with three positions (off, parking, headlamp) and automatic mode explanation. 451 Exterior lamp switch positions and automatic headlight mode Lighting · p69 Combination switch positions for headlamps and turn signals with numbered callouts and arrow diagrams. 451Location callout Lighting controls: high-beam headlamps, high-beam flasher Lighting · p70 Dashboard lighting control switches with callout labels and operational instructions for fog lamps and interior lighting. 451Location callout Lighting controls on dashboard showing hazard warning Lighting · p72 Wiper stalk diagram showing positions 0-3 for off, intermittent, slow continuous, and fast continuous wiping. 451Location callout Windshield wiper switch positions and operation modes for Lighting · p73 Service manual page showing windshield wiper switch positions and operation instructions with two detailed photos of wiper controls. 451Location callout Windshield wiper operation procedures including single Lighting · p74 Multifunction display diagram with callout numbers 1-7 pointing to various display elements and their functions. 451Location callout Instrument cluster multifunction display layout with seven Lighting · p90 Dashboard radio unit with eight labeled control points including power switch, random button, station buttons, display, CD eject, and control panel. 451Location callout Smart radio 9 audio system control layout with numbered Lighting · p96 Radio unit controls labeled 1-8 and glove box AUX-socket location diagram. 451 Smart radio 10 system controls and AUX-socket location on Wiring · p97 Remote key fob disassembly and transmitter battery replacement procedure with numbered callouts. 451Location callout Replacing transmitter battery for remote key fob housing Battery (12V) · p169

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