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Now that you have ruled most of the "normal" electrical failures, you are left with what could be a computer error. The error code stored about Canbus registration errors could be the sign that the canbus controler is shot. If that is the case, the new CAS you have installed could fail to give the ok signal to your ECU.
Probably very expensive to change the canbus controler, no idea to check the hypothesis. Sorry it doesn't help much.
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