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I have an aftermarket cruise-control system which only somewhat works in a 2005 Ford Focus.

By this I mean that it controls the speed but is largely inaccurate (+/- at least 10mph). Going up/down hills causes the speed to slowly increase/decrease for a long while. So it works... somewhat, but, obviously something is broken/failing with the system.

What can I do to diagnose the problem?

It looks identical to this product. I do not know the exact model because it was installed prior to me purchasing the car.

Here are some pictures on console

I think this is the unit under the hood (I'm not sure though...).

what I think is the unit under the hood

enderland
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1 Answers1

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It appears to be a Rostra unit their site http://www.rostra.com/rostra-support.php has an extensive support page. That is why I asked about the tail lights, they mentioned it. I would go to the site input you vehicle info and click the support tab. They will give you step by step instructions included are calibration steps, which may be your issue.

mikes
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