451 Cruise Control
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451 Cruise Control
In 2011 smart added cruise control as an option but it couldn't be retrofitted. If you want cruise control, you need an add on kit
In 2011 smart added cruise control as an option but it couldn't be retrofitted. If you want cruise control, you need an add on kit
What You Get
An official smart cruise control stalk.
Cruise control PCB in protective project case (shown open below).
CAN bus wiring kit. (lower white housing may be black).
Stalk wiring kit.
It goes without saying, before starting any electrical work, disconnect the battery.
Remove the steering column cowelling and swap the stalk over.
Plug the black connector into the stalk
Pull the speedo away from the dash and look at the back. Press down the tab (arrowed in white) and swing the grey arm in an arc down (black arrow) to disconnect the speedo.
Slide the black insert out of the original housing...
...and slide it into the kit supplied housing.
Take the short wiring loom out of your kit and slide the black
connector into the housing that you have left over from earlier.
The small wiring loom is now complete and ready to fit.
Push the connector coming from under the dashboard into the black male connector
of the short wiring loom that came with the kit. Flip the top tab over so it clicks in place.
Push the grey cable down behind the dash. Make sure it doesn't touch the steering column.
Plug the remaining connector back into the speedo and click the tab in place.
Push the speedo back into place to secure it.
Pull the 2 grey cables with the red connectors from under the dash and into the
footwell where the pedals are. We will now be working on the accelerator pedal.
Locate the electrical connection on the accelerator pedal. Right hand drive models have
different pedals to the left hand drive models. RHD are hinged from the top and have the
connection at the top (as shown in the picture below). LHD are hinged at the bottom and
the electrical connection is hidden under the carpet.
Press the tab in and pull the electical connection out.
Open the controller box...
Plug the stalk wiring red plug into the "switch" connection and the remaining red plug
into the "CAN" connection. The wiring for all 3 connections exits the same direction.
...and push the accelerator pedal electical connector onto the PCB as shown below.
Bundle all 3 cables and use the cable tie to secure them in place.
Place the lid back on the project box. On the other end of the controller is an electrical
connection that matches the one on the accelerator pedal. Plug this in to the pedal.
Fitting is now complete. Tuck the controller up under the dash out of the way
(unless you have a diesel 451 in which case leave it visible for the moment).
Reconnect the battery after ensuring that everything is fitted properly.
Pressing the end of the stalk turns the cruise control on and off.
If you press this with the car running but not moving then the cruise will turn on.
If you press this as you are driving then it will turn on and set the cruise control at that speed.
Pressing the brake pedal or the end button again will disengage the cruise control.
Setting Your Cruise Speed
With the cruise control turned on, get up to the speed that you wish to maintain.
Twist the collar upwards towards CONT+ and hold it for 1 second before releasing.
Continuing With Your Set Cruise Speed
If you touch the brake then the cruise control will disengage, to continue at
your set cruise speed quickly twist the collar upward and let go straight away.
Adjusting Your Cruise Speed
With the cruise control set you can click the collar up or down to increase or decrease your speed.
Setting The Speed Limiter
With the cruise control turned on, get up to the speed that you wish to limit your car to.
Twist the collar downwards towards -SET and hold it for 1 second before releasing.
You will now be able to accelerate and brake normally but the car will not go
over the limited speed that you set. To turn off the limiter, press the end button.
Continuing With Your Set Cruise Speed
If you turn off the speed limiter and then wish to continue limiting your
speed, quickly twist the collar downward and let go straight away.
If you have a petrol powered smart then it is pretty much plug and play.
There are brake and accelerator settings that you can adjust if you wish.
If you have a diesel (CDI) 451 then you will need to change that setting at least.
I will write a more understandable settings guide in due course but until then I'd recommend refering to the manufacturer's fitting guide and settings instruction. Click here to read them.
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