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Do you have a air bag light on the dash ? Check ground circuit for lose connection . Ground G203
In the I/P harness, on the left side of the I/P near the A-pillar below the I/P top cover .
Check the wire connector that plugs into the cruise control under the hood. Sounds like a loose connection. Remove the and reinsert the wire connector several times to make a better connection. Stepping on the brake pedal disengages the cruise control by a switch on the brake pedal, not the computer.
cruise control starts working above 50kmh, so if your under that it wont work. the cruise servo may be at fault, or I have seen battery acid leak down on the vacuum lines causing cruise not to work correctly. cruise control works off of a vacuum so without it, it wont work. if the cruise light doesn't turn on when pressing the set/cruise button intermitantly it may be the switch itself that is starting to fail
Check underside of car at transmission. around cruise control for any broken connections, broken or chewed thru wires, or possible loose connections. You cars computer is telling you where to look because of a problem. You will find what's wrong if you take your time. Good Luck Friend.
The problem most likely is with the cruise control computer (ECU) and the fix is to replace it with an older version. I had the same problem and tried replacing other parts and even replacing the ECU with a rebuilt one of the same vintage as the 1993 model. I had the ECU replaced with the previous version at a Saab specialist and it now works all the time. There is a difference in the connections between the different year ECUs that requires some rewiring - you can find rewiring information on the internet.
Try pulling the brake pedal up with your toe and setting the cruise control while you hold it up with your toe. If it engages, stop holding the brake pedal up. It will either disengage immediately or after you hit a bump. Or if you step on the brake, of course.
There's a brake pedal sensor button on the steering column right where the brake pedal arm intersects it. I put a self]adhesive felt pad (buy at wal-mart, home depot, etc) on the pedal arm where it makes contact with the sensor button. Fixed. Been working fine for a year now.
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