If you are seeing open circuit, then it is likely the wiring will be different, I've not looked it up, but I would expect an audio feed to go to the amp and the amp then feeds the speakers.
So you may have to change the wiring first.
I can't see amplifier on the list of VCI codes, but then they don't list all of them. If it does need a VCI code to do the configuration, you are out of luck, as it is unlikely Opel will give you one as to them your car does not support Navi, if they do the cost price is upto 100 Euro + dealer costs.
Investigate the wiring is my advice first.
Who did you find to correct the VIN on the navi, not seen anyone advertise that yet?
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