First of all loosen front wheel nuts, jack up the car and place the axle stand securely. Lower onto the stand. Check for security of car on stand - you're going to be working on it! With the wheel removed it will look like this. You are now going to remove the...
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450 Brake Caliper Removal
First of all loosen front wheel nuts, jack up the car and place the axle stand securely. Lower onto the stand. Check for security of car on stand - you're going to be working on it! With the wheel removed it will look like this. You are now going to remove the...
451 Brake Caliper Removal
First of all loosen front wheel nuts, jack up the car and place the axle stand securely. Lower onto the stand. Check for security of car on stand - you're going to be working on it! With the wheel removed it will look like this. You are now going to remove the...
450 Poly Sway Bar Bushes
SmartMods Poly Bushes Polyurethane is an ideal material for bushes, it is harder than rubber and more weather resistant. The added bonus is that changing the bushes is very easy. These are available on the SmartMods site. Loosen the wheel bolts, jack the front of the...
Diagnosis Hardware & Software
Let your car tell you what is wrong
451 Key Resync
Issue I found that if you don't use one of your 451 keys for a long time and the battery runs out, when you refit a new battery, you may find that the key still won't unlock the central locking. Fault Or Security Feature? Unknown but at a guess, I would say it's a...
453 Fog Light Coding
Adding fog lights to the 453 is a 3 part situation. You have to: 1 - Fit the fog lights and the wiring loom. 2 - Code the fog light ability. 3 - Fit the replacement stalk. Step 2 - Code The Fog Lights Start DDT4All Read the installation and starting guide here. Coding...
Auto Button Switch Test
Not only can the plastic button snap, the actual switch can fail too. Both will stop you selecting auto
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...
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?
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...