So I nipped the 4 wires from the CC and behind the block connector to the steering column harness and used wire nuts to secure connections. In the garage, sliding the CC left lit the dash indicator-- Huzzah! However, on the test drive, engaging the CC by pushing the button resulted in Runaway Cruise Control Acceleration syndrome. Tapping the brake properly disengaged CC, as did sliding the control switch on stalk to off.
I searchd the board both far and wide, recent and old for suggestions to remedy. Many/most solutions referenced a Townsend post that directs removal of the CC relay from its mount and shorting two feed wires. Unfortunately, the Townsend link was dead and I was unable to find any sufficiently useful text posts here or elsewhere that would have been useful to (1) identify the CC relay among the many others behind the knee bolster and beneath the instrument panel, and (2) to identify pin 48 green and pin 33 mauve wires (numbers and colors are approximate).
Then I came across a thread from, say, 2010 that said, in essence, ...After looking at the wiring diagrams for some time and trying several experiments, this worked for me. Connect the green wire to the yellow wire, yellow to green, leave the other two alone....
Rather than laying havoc to beneath-dash relays and wiring I decided to follow the KISS rule: Keep It Simple, Stupid. As so often happens, the KISS rule proved quite effective. I simply undid the wire nuts and swapped the wires, the test drive went flawlessly: push the button at road speed, the 900 locks in solid. Tap the brake, the CC disengages. I'll admit that I haven't tested the acceleration or coast functionality, I care not a whit whether those work.
Sorry for the length of this reply, but writing it took FAR less time than finding and solving the problem of runaway cruise control. I've tried to embed at least some of the search terms I had used when searching the board. I hope the post might lead other Saab 900 afficienados out of the garage and back out on the road.
Disclaimer: Your mileage may vary, it worked in my case and, apparently, back in 2010, but every situation presents its own set of challenges.
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