Re: UEC communication failure - Saab 9-3SS Bulletin Board - Saabnet.com
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I have had very few problems with UEC and in those cases it was a matter of replacing it and code it to car again.
This is one of those problems where you have to be there and run through the menus and try this and try that and see where it takes you. Did you ping the different modules and they responded all except UEC?
Anything can take down a CAN bus but I don't see or hear about it that much on Saab's as I do on Volvo's. It can be a nightmare to find and you have to unplug each module until the bad one is found.
Last week I read about a newer Volvo where just about everything went dead and after a long while, the mechanic found that the parking assist module in trunk was the culprit having some corrosion issues.
Maybe you remember the old 900/9-3 that would refuse to start and P and I-bus was down and it turned out to be the CD changer cable in trunk resting against left/inner fender (no CD changer installed) and building up green corrosion.
I manage to see one of those and was floored with what it could create.
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