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...
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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...
MB Star – Steering Wheel Calibration
450 Fortwo With A SAM And All Roadsters Plug the MB Star multiplexer box into the OBD port of the car, turn on the laptop and boot up Xentry. Press unlock on the key, place it into the ignition and turn it to position 1 to power the car up. When you get to the main...
MB Star – Baby Seat Coding
450 Fortwo With A SAM And All Roadsters So, you have fitted the fixing frame to the car and plugged it in. Time to code it in. Plug the MB Star multiplexer box into the OBD port of the car, turn on the laptop and boot up DAS. Press unlock on the key, place it into...
SAM Unit Clean
If your car electrics are being strange, your SAM could be wet and damaged. Cleaning the PCB can fix it.
Unknown Green Connector
This question comes up about once a month where people have removed their engine and found a spare green single wire connector left over when the engine was refitted. Everything works but they want to know. Here is the green shrouded connector. It's a standard spade...
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,...
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...
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...
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...
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...
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...
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...