The heated seats on the 450 and Roadster seem to have a few common faults that stop them working.
These faults haven't appeared on the 451 yet but if they do, these fixes should help too.
Smartmods
for all your modding needs, recommended by Evilution
News
Dim/Dead Headlights
Headlights stop working but for more than 1 reason.
451 Cornering Lights
You may have seen them on expensive Mercs and BMWs but cornering lights are now available on the smart
Wires Though The Fortwo Bulkhead
There are times when you need to run wires from the inside to the outside of the car. How to do it but keep the water from coming in?
Airbag Connector Replacement
The seat side airbag connections are poor and cause airbag errors so let's change them for better ones
Airbag Connector Maintenance
More often than not, air bag fault lights are bought on by the seat side air bags
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 AC Temperature Sensor
The cabin heater box contains a hidden temperature sensor that the car uses to control the air conditioning. It cross references the heat reading from this sensor and the IR sensor in the heater controller so it can decide how much the air conditioning needs to run...
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...
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...
Roadster Boot Catch Fault
If your Roadster boot doesn't open from the switch or the key, you may have a faulty earth. It's a fairly common issue on the Roadster model. Firstly, make sure that all of the doors are closed and then try to lock the car with the key. If the car locks and then...
External Temperature Sensor 451
The outside air temperature sensor is placed behind the front panel however, changing this sensor does not require the removal of the front panels. The sensor simply pushes in from the back of the lower air dam panel. You can reach the back of the sensor through the...
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?