You get new errors while disconnecting because these modules are not option modules. CAN resistance will also change on certain can line while disconnecting whole control box, thus it will produce new errors.
I would start from sensor, isn't it and inductive sensor reading mast reach position? is the light on the sensor? Does the sensor get the supply voltage?
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.