[Jamothey]

I have a 2008 328i and a couple months ago all of the speakers in my car began to pop non-stop constantly (even when the car is off). I took out the stereo to see if i could determine a problem with the stereo or wiring in the car and i noticed a red light in the stereo box that would turn off at the same time that the speakers would pop. what is the purpose of the red light? and could it possibly have anything to do with the popping in my speakers?

 

[Sn1pes]

Hopefully someone can answer this question, i'm curious.

 

[dharmabmw]

Here's a guess. The red lamp is a power indicator. Something is causing the power to pulse on and off. Since the stereo feeds amplifiers for the speakers, the speakers will pop due to the pulse being amplified.

 

[ctuna]

First thing to check if you have an amplifier is that there is not
water in the amp area. This is a common problem.
Usually the reports of this increase after heavy weather.

Second thing is if you have a pro head unit and not and idrive
there are some that are known to be defective.
See last link.

It is important to identify your sound system and which head unit you have.
There are two head unit types(in the US more WorldWide) and three speaker amp or no amp combinations.
(common ones)

BMW stereo types
http://www.e90post.com/forums/showthread.php?t=352586
http://www.e90post.com/forums/attachment.php?attachmentid=350502&d=1266451970
http://www.e90post.com/forums/attachment.php?attachmentid=334282&d=1260829447
http://www.e90post.com/forums/showthread.php?t=343673
http://www.e90post.com/forums/showthread.php?t=138949
http://www.e90post.com/forums/attachment.php?attachmentid=151088&stc=1&d=1209780605
http://www.e90post.com/forums/attachment.php?attachmentid=151087&stc=1&d=1209780865
http://www.e90post.com/forums/showthread.php?t=641323
http://bmwcoders.com/forum/3-er-8/bmw-e90-e91-e92-e93-291/
http://technicpnp.com/menuDiagrams/diagram_template_e90_92_93.html
http://www.musicarnw.com/page-2/
http://www.e90post.com/forums/attachment.php?attachmentid=55323&d=1169133185
http://www.e90post.com/forums/attachment.php?attachmentid=406534&d=1278871872

http://www.e90post.com/forums/showthread.php?t=1036190