300ci (Saturn series), long long time ago
We have had several cases in past because of faulty motor inside from belt, but in your case i think it`s related to bad connection.
Before you are able to swap the drums, you has to lift up or remove the belt.
Did you maybe unplugged the belt connector?
If yet, check the pins inside from connector at the rear frame.
connector from belt wiring---> female
connector at the frame----> male
At Saturn series, it was possible to turn on the motors during existing C-Call.
Enter U030 and try CRM motor.
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