Try this link. I had a similar problem. The GDL website is good cause it shows you how to test all the cruise parts. Before I went through the tests on the gdl website I actually called the guy, described the issue, and they virtually assured me it was the amp. Told me not to even bother testing the other stuff. Popped in a used amp and problem solved. You can get them used for $50 bucks shipped from www.europeanautomotivegroup.com.

http://www.peachparts.com/shopforu...130#post883130

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Eric Zacharias

'88 300 SEL
'64 Ford Falcon
'99 Infiniti QX4