Factory Bose radio buzzes/whines as rpm increases

[manuel_hero]

2008 Envoy Bose radio speakers whines/buzzes intermittently. Mostly when someone shuttle rear passenger door. Anyone have any suggestions what this could be?

 

[The_Roadie]

All speakers?

The Bose amplifier is in the rear cargo compartment (passenger side for a short wheellbase truck - driver's side for the EXT/XL) behind the side panel. The wiring from the head unit should be shielded and I guess yours is damaged somewhere near the door sill of the rear door. Remove the trim pieces and inspect all the wiring you can see for damage.

 

[manuel_hero]

Yes it is all the speakers. I will check it out this weekend. Thanks.

 

[jrSS]

My 07 tb does this. Its the rear passenger door. Could it be a bad ground. U can hear the turn signals ...rpm increase and such. Bad ground?? Also when the rear entertainment center is turned on (which only then plays front speakers its all gone)