In case you run into this issue, it took me some time to figure it out searching online...I installed a 5600BHS with a bypass. It turns out the bypass would allow video to play but certain functions were still locked out. I think the locked out functions are just auto eq and firmware updates. I needed to install a firmware upgrade but could not because of the bypass. I ended up having to pull the head unit out and wire to the parking brake properly. Ironically, the only reason I went with the bypass is I was feeling too lazy to tap the parking brake.
-Mark
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