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Have you contacted PAC? Resistance is resistance, it's not that it's a different brand of car. If you do have the variable resistance design, then Vauxhall may use a different range of resistance. You might need to add a certain size of resistor from the data line to ground to get the PAC to read it, but that is something only the PAC people would know for sure.
You could also take the buttons apart and wire each one to an IPAC like in post #1. Or you take apart a small remote and wire the button directly to the remote buttons and mount the eye on the backside of the steering wheel.
Does anybody make any kind of radio adapter for your car?
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