black plastic inside door card? what for

[AlexG]

currently have my door card off and am sound deadening the doors. on towards the back of the door inside, is a large black plastic something? with diamond shape holes in it. what does it do and can i remove it as it make an awful rattle when music is even played at low volume!
pic:

 

[wallop]

Remove it whilst you deaden around that area, when you refit it simply silicone around the mounting & retaining clips to hold it firmly in place.....Try playing music before you refit the doorcards and add silicone to any area that its rattling at....

 

[AlexG]

cheers wallop. ive unclipped it and realised it holds one side of the window as it is wound down. ive turned the music on and that is the piece that is rattling. its too big to get out of the door without cutting it so ill do what you said. thanks again!

 

[Tigger]

Some idiot told me last year it was part of the "impact safety device" lol

 

[maz172cup]

its there to protect the window when u slam the door