451 Factory Cruise Control

Mod Details

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This Is All Guesswork

A few people have asked me about retrofitting the standard 451 cruise control with the buttons on the steering wheel. I have given them the information required but none of them have actually done it or got back to me.

Is Your Car New Enough?

Your car must be manufacturered after October 2010 (according to smart).

Do You Have The Correct Speedo?

All 451 fortwos with factory fitted cruise control came with the speedo with a trip computer. The standard speedo didn’t have the symbols to display the cruise control state or the set speed. Kate W from Smart-Stuff confirmed that the trip computer speedo is not required. The standard speedo can be used but it obviously won’t display the speed at which the cruise is set.

Do You Have The Correct Steering Wheel?

Actually finding a 2nd hand cruise control steering wheel is small, however, if you have a standard paddleshift steering  wheel fitted to your car, you can just add the cruise control buttons, fascia and steering wheel wiring loom.

Buttons – A451 905 10 00
Cover Panel – A451 462 06 95

If you don’t have a paddleshift steering wheel, you’ll have to buy one. Make sure you get one from a car manufactured after October 2010 (according to smart).

Do You Have The Wiring?

If your car is manufactured after October 2010, you should have all of the wiring necessary and they should all be connected. However, you do need to double check before wasting your money on anything.

You should have a wire in every one of the 10 positions. If you are missing wires 3, 4, 8 and 9, you don’t have the wiring required for standard cruise control.

Everything Good So Far?

OK, so you have the wiring, you have fitted the trip computer speedo and cruise control equipped steering wheel and the cruise control doesn’t work.

What The Hell?

This is the hard part. You have to go to a smart dealer and have the car coded to activate the cruise control. The reason this is the hard part is that your smart dealer almost certainly won’t have done this before. They won’t know what to do or how to SCN code the car correctly. They may even say it can’t be done.

They do it at the factory so of course it can be done. You just need to keep asking until they work it out.

Working Cruise Control

Once the car is fitted with the correct steering wheel, speedo and coding, the cruise control should work correctly.

Do I Really Need A New Speedo?

There is a good chance that the car will work without upgrading the speedo since all of the coding and computing goes on in the ECU.

The connection to the speedo is to light the LEDs in the cruise control buttons. However, the ECU does communicate the state of the cruise control and the set speed
through the CAN bus to the speedo. If the cruise control relies on data being communicated back from the speedo to the ECU, you will need an upgraded speedo.

Kate W from Smart-Stuff confirmed that the trip computer speedo is not required. The standard speedo can be used but it obviously won’t display the speed at which the cruise is set.

Credit

Thanks to Dimitris S for pointing out the connection errors.