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In Diagram 2 (I have the manual before me, for assembly of your model) it is clearly shown that cable connectors 10 and 12 are plugged together.
Other diagrams indicate a cable or two coming out of the main frame part's front post, and also diagrams indicate a cable out of the top of the front post part, which presumably connects to the console or 'computer'. Look for that cable, it is vitally necessary for the whole to work properly.
Perhaps it goes lost inside the front post part. If so, that part may have to be taken off again, and turned upside down and shaken, and looked into with a flashlight, and probed with tweezers or other tool, to retrieve the cable, that should come out of the top of the front post and connect to the 'computer' or console. (You will of course have to dismount the console again before doing this.)
Let me know how it goes, I want to help you to a good conclusion of some sort. Thanks.