The SAM unit (Signal Acquisition Module) on the Smart Fortwo 450, equipped with a 0.7 petrol engine, serves as the central electrical hub of the car. It manages power distribution, fuses, relays, and communication between multiple vehicle systems, including lighting, engine management, comfort features, and safety systems.
Below is a clear, text-based breakdown of the SAM unit connectors and their functions, designed to be easy to read and practical for troubleshooting.
N11-1 Connector – Comfort and Body Functions
- Pin 1 – Window switches (Black / Yellow-White / Black) – Fuse 4
- Pin 2 – Heater blower motor & heated seats (Black / Red) – Fuse 3
- Pin 3 – Air conditioning connections (Black / Yellow) – Fuse 8
- Pin 4 – Wiper stalk and relay (Pink / Red) – Fuse 2
- Pin 5 – Front fog lights (Violet) – Fuse 13
- Pin 6 – ESP controller (Red / Black) – Fuse 14
- Pin 7 – Radio power (Pink) – Fuse 12
- Pin 8 – Master engine relay – Fuse 10
N11-2 Connector – ECU, Soft Top & Diagnostics
- Pin 1 – ECU (MEG unit) supply (Brown / Green) – Fuse 9
- Pin 2 – Wing mirrors & rear window heater (Black) – Fuse 28
- Pin 3 – Trip computer, OBD, speedometer voltage (Red / White) – Fuse 11
- Pin 4 – Safety triangle power (Red / Green) – Fuse 11
- Pin 5 – Ground / earth (Brown)
- Pin 6 – Soft top motor forward (Yellow) – Fuse 29
- Pin 7 – ECU (MEG unit) signal (Blue)
- Pin 8 – Soft top motor reverse (Red / White) – Fuse 29
N11-3 Connector – Lighting and Fuel System
- Pin 1 – Rear window wiper – Fuse 17
- Pin 2 – ESP control unit (Grey / Green) – Fuse 18
- Pin 3 – Soft top switch & mirror adjustment (Red / Yellow) – Fuse 19
- Pin 4 – Trip computer, OBD, heated seats, radio (Blue) – Fuse 20
- Pin 5 – Cigarette lighter socket (Blue / Yellow) – Fuse 21
- Pin 6 – Low beam left (Grey / Red) – Fuse 22
- Pin 7 – Low beam right (Blue / Green) – Fuse 23
- Pin 8 – High beam left (White) – Fuse 24
- Pin 9 – High beam right (White / Blue) – Fuse 25
- Pin 10 – Fuel pump supply (Red / Black) – Fuse 16
- Pin 11 – Brake light switch (Blue / Red) – Fuse 26
- Pin 12 – ECU (MEG unit) (Red / White or Green / White) – Fuse 27
N11-4 Connector – Ignition
- Pin 1 – Ignition position 1 (Red / Black)
- Pin 2 – Connector Z24 (Pink)
N11-5 Connector – Wipers, Interior & EVAP
- Pin 2 – Rear window wiper – Fuse 17
- Pin 3 – Wiper relay (Red)
- Pin 5 – Ground / earth (Brown)
- Pin 6 – Light stalk (Red / White) – Fuse 5
- Pin 7 – Boot release & window switch (Brown / White) – Fuse 6
- Pin 8 – Interior lamp (Red / Green) – Fuse 12
- Pin 9 – Rear lights (Brown / Yellow-Grey) – Fuse 7
- Pin 10 – Connector Z36 & EVAP purge valve (Green) – Fuse 30
- Pin 11 – ECU (MEG unit) (Black / Pink) – Fuse 16
- Pin 12 – Connector Z35 (Yellow / Black) – Fuse 10
N11-6 Connector – Starting & Air Pump
- Pin 1 – Starter signal (Blue) – Fuse 1
- Pin 2 – Electric air pump (Pink) – Fuse 32
N11-7 Connector – ESP & Ignition Main
- Pin 1 – Steering assist control (Red / White) – Fuse 35
- Pin 2 – ESP control unit (Red / Black) – Fuse 34
- Pin 3 – Ignition main (Red / Black) – Fuse 33
N11-8 Connector – CAN, Switches & Safety Systems
- Pin 1 – Not used
- Pin 2 – Boot microswitch (Pink / Yellow)
- Pin 3 – Wiper stalk signal (Grey / Red)
- Pin 4 – Right door switch (Yellow / White)
- Pin 5 – Not used
- Pin 6 – Not used
- Pin 7 – Not used
- Pin 8 – Crash restraint system (Yellow / Green)
- Pin 9 – Wiper motor control (Pink / Red)
- Pin 10 – Light stalk and trip computer (Green / Blue)
- Pin 11 – Cruise control stalk – pin 2 (Black / Green)
- Pin 12 – Not used
- Pin 13 – Ground / earth (Brown)
- Pin 14 – Speedometer CAN Low (White / Black)
- Pin 15 – Speedometer CAN High (Brown / Red)
- Pin 16 – Steering wheel connection (Red)
- Pin 17 – Wiper stalk signal (Yellow)
- Pin 18 – Door switch (Blue / Black)
- Pin 19 – Left door switch (Yellow / Red)
- Pin 20 – Boot switch (Green)
- Pin 31 – Blower multi-way switch (Blue)
- Pin 32 – Soft top strut switch (Blue / White)
- Pin 33 – Soft top strut switch (Pink / Black)
- Pin 34 – Handbrake switch (Grey)
- Pin 35 – Soft top power switch (White)
- Pin 36 – Not used
- Pin 37 – Not used
- Pin 38 – Ignition position 2 (Grey / Blue)
- Pin 39 – ECU & steering assist CAN Low (White / Black)
- Pin 40 – ECU & steering assist CAN High (Brown / Red)
N11-9 Connector – Lighting, Cruise Control & Interior Controls
- Pin 1 – Left turn signal (Black / White)
- Pin 2 – Air conditioning switch, position 2 (Grey)
- Pin 3 – OBD diagnostics line (White / Grey)
- Pin 4 – Interior lamp signal (Grey / Blue)
- Pin 5 – Not used
- Pin 6 – Fog lamp relay control (Pink)
- Pin 7 – Cruise control stalk – pin 1 (Pink / Red)
- Pin 8 – Not used
- Pin 9 – Automatic light switch (Blue / Yellow)
- Pin 10 – Cruise control stalk – pin 3 (Green / Blue)
- Pin 11 – Right turn signal (Black / Green)
- Pin 12 – Hazard warning switch (Violet / Blue)
- Pin 13 – Central locking switch (Blue)
- Pin 14 – LIN Bus to Trip Computer and automatic light/wiper sensor (Violet)
- Pin 15 – Not used
- Pin 16 – Wiper relay control (Blue / White)
- Pin 17 – Not used
- Pin 18 – Automatic light switch (Blue / Yellow)
- Pin 19 – Not used
- Pin 20 – Key remote receiver (White)
- Pin 31 – Air conditioning switch, position 1 (Green)
- Pin 32 – Heated rear window switch (Black / Red)
- Pin 33 – Light stalk signal (Yellow / Red)
- Pin 34 – Light stalk signal (Yellow)
- Pin 35 – Light stalk signal (Yellow / Green)
- Pin 36 – Wiper stalk signal (Green / Blue)
- Pin 37 – Fog lamp switch (Yellow / Black)
- Pin 38 – Light stalk signal (Blue)
- Pin 39 – Light stalk signal (Black / Green)
- Pin 40 – Wiper stalk signal (Red / Green)
N11-10 Connector – Power Supply, Horn & Cooling Systems
- Pin 1 – Footwell earth / ground (Brown)
- Pin 2 – Air conditioning compressor control (White)
- Pin 3 – Coolant radiator fan control (Brown / Green)
- Pin 4 – Door open signal (Grey / Blue) – Fuse 31
- Pin 5 – Door closed signal (White / Blue) – Fuse 31
- Pin 6 – Horn control (Blue / Red) – Fuse 31
- Pin 7 – Intercooler fan control (Yellow) – Fuse 15
- Pin 8 – Boot / tailgate open solenoid (Red) – Fuse 31
N11-11 Connector – Main Battery Power Supply
- Pin 1 – Permanent 12V supply from battery (Red)
