cruise control not working on 86 C4

[Bob Yates]

I've replaced the servo and that didn't do it.I've checked the brake switch and it checks out. I've checked all the fuses and they are OK. My Speedometer works so I guess my speed sender is working. I've ckecked all the wiring and grounds and they are all fine. I've checked out the speed control switch and it checks out good....I sure hope this is not one of those dash problems where the whole cluster has to be sent out...Please say it isn't so... Thanks for any light on the subject...I would like to have it for a trip I am planing.....Bob Yates

 

[Bob Yates]

P.s.

I've checked out all the vacuum and it's good....Later Bob Yates

 

[G Winter]

Broken cable ?? I am not sure what controls the cruise , is it the ECM ? if so maybe a bad ECM ? just a couple thoughts .

 

[Ken]

If you've got Gordon Killebrew's book on the digital dash, I think it mentions something in there about how the cruise control function ties in with the speedometer in the digital readout. Maybe JonM will see this and look it up for you.