Category: 454

My Smart Car’s handbrake travel is very high, why?

It’s probably the rear shoes and adjusters that need cleaning and adjusting properly, these usually get done about every 4th year – it could be the rear wheel cylinder seals have failed and are weeping brake fluid. A competent garage can remove the rear hubs and clean and inspect the cylinders and replace and adjust as necessary.

Why is my Smart car having trouble selecting gear?

It could be one of several things: 1. Check the rear lights to see if the brake lights are working; if not then it’s probably the brake light switch which is faulty and needs replacing. (On a 450 it’s between the under tray and the car chassis and it helps to have the car on a ramp. On a 452 or 454 it’s under the brake pedal in the foot well.) 2. Then the wiring to the gear selector motor needs to be checked to see if there is damage to the wiring causing electrical short circuits 3. Check the clutch actuator adjustment and operation 4. The clutch unit may be worn and need replacing, always replace the release bearing at the same time

My Smart car battery is flat can I bump start it? [454]

Yes, see section 9 36 of the forfour manual. This is the procedure from the manual for the 450 / 452 always make sure it is safe to do so *safety note potential hazard item* Turn ignition to position 1 Put the handbrake on Press the footbrake and hold Hold the gear lever in the forward + position Release the footbrake Press the accelerator to the floor (while stationary) Release the handbrake and start rolling (you need a good shove though or steep hill) Once moving the clutch will automatically engage and the engine will start

My Smart car radio says “SAFE” or “CODE” what do I have to do to get it working again?

If the head unit doesn’t work and the display reads SAFE or CODE, then the memory has been lost (usually after a battery disconnect) and the anti-theft protection is activated. The display should show “SAFE” or “CODE” then revert to four dashes after 3 or 4 seconds at power on (if you haven’t put a code in recently). Enter your code at this point (when the 4 dashes are shown), then press the smart symbol button to confirm the code. The radio should be activated. Example – if your code is 4321 you would get the 4 dashes to show and then press the “1” button x4 four times, the “2” button x3 three times, the “3” button x2 twice times and the “4” button x1 one time. It’s a bit like text messaging using 1 button for multiple options. Then press the Smart symbol button once after all digits are correct. If you get it wrong, the unit will go into a wait state showing SAFE again (not allowing any more input) for an increasing time (starts at 20 seconds or so ) , you can do this up to 7 times by which time the wait period before it lets you re enter a code is 24 hours before you can put another sequence in – using the 4 station pre-sets. If you don’t have a code or it’s not correct then you need to apply to a main dealer for a radio code, V5 registration docs and ID will be required usually and a fee usually about £30 depending on each dealer.

My Smart car won’t start and it shows a little key symbol in the centre of the dash, why?

The immobiliser is still on. It turns itself on automatically after 60 seconds if you have not started car after unlocking it. Remove the key and unlock the car again. Then, replace the key and start as normal. See next section.

My Smart car key unlocks the car but won’t turn off the immobiliser, why?

It likely the key has lost its coding (9 indicator flashes should accompany this when pressing the key fob unlock or lock button if it’s faulty) and will have to be re-coded along with the car and any spare keys you might have too. They all will have to be taken to someone with a Star Diagnostic machine to re-code them all together. Its worth getting an additional new key before so you can get it coded at the same time, if you don’t already have a spare key.

My paddle steering wheel is not working properly. It does not change gear on one side properly or it is intermittent, what might be causing this?

It’s probably the steering wheel angle sensor which has failed, these cannot be bought separately, only as a whole steering wheel. The problem needs a diagnostic machine to verify, if this is the case a new steering wheel is the answer. The car looks to the steering wheel angle sensor to see how much steering input you have when deciding how to brake safely in an emergency. Safety note: the ABS and ESP may not work properly in an emergency if these are faulty.