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Hugh - might be worth searching the main forum to troubleshoot unit. I did a fast search and it looks like 88-89 is the first year of VDO electrical unit vs earlier vacuum unit. I am not an expert by any stretch, but I also know there is / was a relay in my car specific to the cruise. If yours is the same, perhaps switching out the relay is step 1? I am sure there are many here that know much more than I do.
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Vince
2015 Boxster S, Black & Black
1989 Carrera Silver Coupe, Silk Grey - sold
2009 Cayman S White, Full Cocoa - sold
1972 911E Silver Coupe, Pepita & Black - sold
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