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There is no other way, if it needs a new CIM.
Replacement and programming should be done by the dealer.
I've replaced many CIMs in different GM based vehicles.
My advice to you is to follow GM protocols.
I hope you get it sorted.
Merry Christmas to you and your family.
The CIM in a SAAB is similar to OPEL which both of are GM based.
The CIM is the bus master, meaning nothing works without a working CIM.
Starting the car without a programmed key present may not be possible.
I'd say you'll be taking your own chances with adding a system like that, but IF you find a PRO installer who is willing, AND has done this before, then go for it.
Personally, I would not be doing anything like that, risking blowing up many modules.
Ok, yes you could use the new system to operate the door locks only, independant of the factory system.
Be aware the interior light, door ajar light, chime etc need to see the lock assemblies status to work correctly.