Engine Whine in Speakers

Bingobimmer · 04-20-2019, 08:31 AM

My car has a hissing noise coming through the speakers as soon as I unlock it or open the doors (basically whenever the electronics come on). I have found some videos on youtube with the same problem but on other cars. The way others have fixed it is grounding the RCA cable coming into the head unit. However, our cars don't have an RCA cable going into the head unit.

Has anyone else had this problem? Does anyone know which wire in the harness is RCA?

I have the base stereo with no amplifier. I have checked all the stereo fuses and checked the grounds on the battery. Thanks for any help.

mweisdorfer · 04-21-2019, 07:09 AM

Quote:

Originally Posted by Bingobimmer

My car has a hissing noise coming through the speakers as soon as I unlock it or open the doors (basically whenever the electronics come on). I have found some videos on youtube with the same problem but on other cars. The way others have fixed it is grounding the RCA cable coming into the head unit. However, our cars don't have an RCA cable going into the head unit.

Has anyone else had this problem? Does anyone know which wire in the harness is RCA?

I have the base stereo with no amplifier. I have checked all the stereo fuses and checked the grounds on the battery. Thanks for any help.

I think all the grounds have to be at the same place, or you can get interference

bluewater328 · 04-21-2019, 12:26 PM

I can tell you that I actually replaced my head unit under warranty (back when I had one) for similar reasons. The dealer laughed as they immediately thought it was the amp (that they couldn't find in my base system). Problem resolved when they replaced the head unit. And for reference, I have a 3/2010 build.

Ground is a good first check, but this solved my problem.

Stubbie Blue · 04-21-2019, 12:51 PM

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

I had the hissing noise but I replaced my headunit with an aftermarket Android unit and now the noise is gone.

ctuna · 04-21-2019, 01:18 PM

90 percent chance you have a bad head unit with hiss in a base system.
You can try re seating the connectors to the radio. That has worked
for some people.
The radio or idrive is never really off as it runs the chimes and gongs
in most model years. It goes to sleep after a set amount of time depending
on conditions such as paired cell phones and locking the car.

There are no RCA cables you can't treat this like and aftermarket stereo.

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

04-20-2019, 08:31 AM	#1
Bingobimmer Captain 157 Rep 637 Posts Drives: e90 n54 Join Date: Dec 2011 Location: On the road... iTrader: (1) Garage List 2009 E90 335i sedan [0.00]	Engine Whine in Speakers My car has a hissing noise coming through the speakers as soon as I unlock it or open the doors (basically whenever the electronics come on). I have found some videos on youtube with the same problem but on other cars. The way others have fixed it is grounding the RCA cable coming into the head unit. However, our cars don't have an RCA cable going into the head unit. Has anyone else had this problem? Does anyone know which wire in the harness is RCA? I have the base stereo with no amplifier. I have checked all the stereo fuses and checked the grounds on the battery. Thanks for any help. __________________ LOST BUT NOT FORGOTTEN 2009 E90 335i AW... Black grills/jb4/lux angel eyes/clear side reflectors/and a few more small mods 2011 e92 335iSSSS Black
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04-21-2019, 12:26 PM	#3
bluewater328 Colonel 626 Rep 2,099 Posts Drives: 2011 bluewater 328i LCI sedan Join Date: Aug 2010 Location: Hawaii iTrader: (0)	I can tell you that I actually replaced my head unit under warranty (back when I had one) for similar reasons. The dealer laughed as they immediately thought it was the amp (that they couldn't find in my base system). Problem resolved when they replaced the head unit. And for reference, I have a 3/2010 build. Ground is a good first check, but this solved my problem.
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04-21-2019, 12:51 PM	#4
Stubbie Blue Private First Class 145 Rep 157 Posts Drives: 2012 135i Coupe Join Date: Mar 2017 Location: Florida iTrader: (0)	https://www.e90post.com/forums/showthread.php?t=1036190 I had the hissing noise but I replaced my headunit with an aftermarket Android unit and now the noise is gone.
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04-21-2019, 01:18 PM	#5
ctuna Lieutenant General 1911 Rep 13,104 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	90 percent chance you have a bad head unit with hiss in a base system. You can try re seating the connectors to the radio. That has worked for some people. The radio or idrive is never really off as it runs the chimes and gongs in most model years. It goes to sleep after a set amount of time depending on conditions such as paired cell phones and locking the car. There are no RCA cables you can't treat this like and aftermarket stereo. https://www.e90post.com/forums/showthread.php?t=1036190 Last edited by ctuna; 04-21-2019 at 01:24 PM..
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