More often than not, air bag fault lights are bought on by the seat side air bags
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451 Heater Blower Failure
For some unknown reason, the America cabin heater blower fan fails. I have yet to see this happen outside of the US.
451 Heated Seat Retrofit
There is an easy way and a less easy way to retrofit heatet seats to your 451. It really depends on the year your smart was made. From around 2008 to 2010, smart started to include all the wiring for the heated seats so all you have to do is plug in a few things....
Roadster Heater Fan Fault
The Roadster heater switch is a weak point in the system and can fail, here is how to fix and prevent it happening
Roadster Roof Override
The 450 fortwo had a way to manually open and close the roof using a pair of metal cranks that you got with the car, unfortunately on the Roadster, this wasn't the case.The electrics in the Roadster are temperamental at the best of times so how do you force the roof...
450 Dash Pod Clock Fault
The dash clock pod in the 450 has a habit of suddenly losing a lot of time. Time to fix.
451 Fortwo Rear Bearings
Loosen the wheel bolts, jack the car up and remove the wheel. Use a Torx30 to remove the drum fixing. Release the handbrake and pull the drum from the hub. With the car in reverse the driveshafts are locked. Use a 21mm socket to remove the centre bolt. Remove the...
Disconnecting The ECU
Sometimes (not often) you might need to remove the ECU, either for sending off to get it remapped or to re-site it elsewhere if you fit a different airbox
451 Licence Plate Bulbs
How to change the bulbs that illuminate the licence plate at the rear of the car.
453 Indicator Bulb Change
Small Access Panel Look into the front edge of the front wheel arches on your 453. You'll see a flap. Pull the tab down and pull the flap by the central finger hold. You don't need to jack the car up to gain access but if you need more room, go for it. Just steering...
External Temperature Sensor 450
The external temperature sensor is the device that relays the outside temperature to the speedo. It's wired directly. The sensor is just a thermistor which means that it changes resistance depending on the temperature. The resistance is then converted to a temperature...
Airbag Delete Resistor
Maybe you keep having an airbag light come on, perhaps you have fitted an aftermarket steering wheel, maybe you are tired of the seat side airbag connections failing. Of course, there are other possibilities such as wishing to use aftermarket seatbelt reels or you...
451 Paddle Wheel Doesn’t Work
Don't you just love it when smart changes the wiring for stuff for no reason.
Key Button Replacement
Key Tactile Switches The 450, Roadster and original Forfour use the same tactile switches on the key PCB. As with most things these days, they are probably the cheapest parts they could find for the job. They are low quality, have no internal dust protection and are...
450 Keys Stopped Working
Both Keys Don't Work When I say "don't work", I mean nothing. Not even the indicators flashing 9 times. Sometimes both keys will be temperamental but both will either not work at all or work OK. Firstly, check that both key batteries are OK by fitting new ones (not...
451 Throttle Body Wire Fault
A new fault is appearing on the 451 that can be fixed before it occurs
Spanner & Gear Indicator Flashing
1 or 2 spanners flashing and the gear indicator also flashing, what could it mean?
Wiring Repair Connectors
Repair Wiring Kits Repair kits are normally the plastic housing populated with terminals, each with a length of wire crimped to each terminal. The colours of the wires will mainly match up with a few exceptions. The idea with these repair kits is that the faulty...
Canadian E-Box Failure
Only Canadian Smart 450s Need Apply This is one of those faults that only affects 1 type of car. Strangely it only affects 450s in Canada. This fact becomes less strange when you realise that the part that fails is only fitted to Canadian 450s. Of course, that does...
Auto Button Switch Test
Not only can the plastic button snap, the actual switch can fail too. Both will stop you selecting auto