Rear sun shade run amok

[ChiTDI]

2012 Avalon, rear window screen has been opening and closing by its own choice. Activates a claxon when the transmission is placed in reverse, and the noise turns off when the activating switch is depressed. The screen, however, is locked in the full open screen mode.
Anyone know how to safely disarm this monster? I’d be happy if it never operated, but don’t want to cause more problems than I have.
I’m not making this up!

 

[wag123]

2012 Avalon, rear window screen has been opening and closing by its own choice. Activates a claxon when the transmission is placed in reverse, and the noise turns off when the activating switch is depressed. The screen, however, is locked in the full open screen mode.
Anyone know how to safely disarm this monster? I’d be happy if it never operated, but don’t want to cause more problems than I have.
I’m not making this up!

I would think that unplugging the motor in the rear would do the trick. Check to see if it has a dedicated fuse, if it does, pull it and see if that works.

 

[LDB]

The dealer will be glad to resolve it for you for $834.