2012 non-JBL wiring diagram - parking brake signal to tap into?

I am looking for the 2012 prius non-JBL parking brake sense signal to attach to the aftermarket head unit without buying a harness.

I assume this has been solved before (point me to the thread if there is one), but I would like to not bypass the function.

I think it is in the 16 pin L148 connector pin 6?

Ideally someone could share the stereo diagram for the L148 - 16 pin connector and L149 28 pin connector (which I plan to tap into for the steering wheel audio controls).

I think most might use the 16 pin connector for connecting to the factory backup camera (mine doesn't have the camera installed). In this case the camera will connect directly to the aftermarket head unit so I just think I need the parking brake signal from this connector?

Pictures of those that already have tapped into the parking brake signal would be appreciated.