Only switches related to this issue at hand that I'm aware of are overall dashboard lighting (dimmer/brighter) and HUD lighting (dimmer/brighter). The sunvisor mirror lights wouldn't/shouldn't be run through a dimmer, and the only switch they need is right there at the sunvisor. By the way...
I too have bought TONS of stuff off e-bay, but the early fobs are just too expensive for me when new like e-bay sellers have. Hoping someone has one left over from one of their cars that's been sold or wrecked out. Thanks for the thought though!
The dimmer switch, if slid down to the bottom, will generally turn the HUD "off" FYI. Before anything else, slide that switch up all the way; could be the HUD works fine and it was turned off by accident in cleaning, or the previous owner found it distracting.
The HUD is only connected to the IP Cluster itself and nothing else. Look for fuses related to the IP Cluster. Also, try cleaning the dimmer switch (spray electrical contact cleaner in and work the slide).
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