Problems Another thing that dies due to water ingress in the Roadster is the power steering controller. However, it also happens in the fortwo 450 although it's much less likely. The reason for the issue is the placement in the cars. This unit sits low in the footwell...
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450 Fortwo Speedo Cloning
Cloning The Fortwo Speedo Cloning is a process where you take data from 1 item and copy it to another to make an exact replica. Why Would I Need To Do That? If your speedo has failed completely, has a hardware or PCB fault, you need to fit a new speedo. Can I Just Fit...
454 Forfour Speedo Cloning
Cloning The 454 Forfour Speedo Cloning is a process where you take data from 1 item and copy it to another to make an exact replica. Why Would I Need To Do That? If your speedo has failed completely, has a hardware or PCB fault, you need to fit a new speedo. Can I...
SAM Unit Clean
If your car electrics are being strange, your SAM could be wet and damaged. Cleaning the PCB can fix it.
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...
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...
Diagnosis Hardware & Software
Let your car tell you what is wrong
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...
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...
451 Paddle Wheel Doesn’t Work
Don't you just love it when smart changes the wiring for stuff for no reason.
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...
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...
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 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...
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...
Roadster Central Locking Issues
Roadster Immediately Unlocks After Locking Back around 2009 I bought a fucked Roadster. The low mileage car was OK but it wouldn't start and wouldn't stay locked. The non starting was met with a CAN bus fault so I decided to check the continuity of every single wire...
Forfour Fuel Gauge Fault
What Are The Symptoms? If your fuel gauge on your 454 forfour is flashing, or the fuel level moves up and down for no reason, there is a good chance that it's a problem in the speedo. The issue is the same as we have seen in the dash pods on the 450 fortwo. Wide...
451 Rear Bulb Change
451 Coupe & Cabrio Replacing the lights on the new smart is a whole lot easier and quicker than before. Open the boot and look to each side, you will see a flap on each side. The offside flap (shown below) hinges forwards when the clips are pushed in (circled...
450 Fuel Flap Locking Solenoid
Fuel Flap Lock Solenoid Removal Remove the rear light on the fuel flap side. You do this by removing the 2x 10mm plastic nuts from the top and bottom of the side of the light. Hinge the light away from the car... ...and disconnect the wiring connector. You can now see...
453 Alarm Fault
Bob S was one of the many people experiencing the alarm on his 453 going off all the time. It's already a known fault at smart so we know the problem. The problem is the switch. The switch is pushed in by the bonnet (hood). If the bonnet is removed or tampered with,...