In reply to:
The steering wheel remote circuits only show a simple resistor and a blue wire running to the headunit
That's good - it's safe to plug into your tuner, then (you may need to add a 3.5mm stereo jack).
In reply to:
| Volume Up | 1270 ohms |
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| Volume Down | 294 ohms |
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| Mute | 823 ohms |
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| Seek Up | 715 ohms |
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| Seek Down | 1180 ohms |
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| Preset | 9350 ohms |
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These are all smaller than the Sony, though your 'Preset' button might work as 'Forward track'.
From here, all I can suggest is to see if you can replace the factory resistors with what you need, or to look for a third-party adaptor for your vehicle - or convince a (competent) friend to make you one.
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