[kavadarci]

Hi,
All of sudden I get no sound from my unit.
I can switch to ipod, radio, cd no problem and I can see that the station is selected, the cd is playing and the usb ipod is playing but NO SOUND.

Is there is a reset somewhere, what can cause something like this?
Thank you.

[jsunma]

Same thing has happened to me just today. Playing fine. Turned off car...turned back on, no sound. Just as op said.

2008 "professional" head unit here.

Any ideas?

[gbarba]

i had the same problem so i took it to a dealership to get checked and they told me that my amp was out! the car is out of warranty so just the amp alone was $1300 plus labor. good luck

[jsunma]

Originally Posted by gbarba

i had the same problem so i took it to a dealership to get checked and they told me that my amp was out! the car is out of warranty so just the amp alone was $1300 plus labor. good luck

It's certainly logical that it's the amp, but I'm also wondering if it's not the amp itself but rather how the amp (etc.?) communicates on the car's network. I've found that when I get the "no sound" problem (it's happened maybe 3 times in the past couple of months), the problem resolves itself after I've had the car turned off for at least 10 minutes. It seems as if something needs to reset, and afterwards things are back to normal. I've never had the sound die while listening. The problem only occurs when the car has been turned off...and then I go to restart and get no audio.

I've also noticed that when the car's having this problem, my HU doesn't display options for the phone or iPod, even when both are connected. In short, it seems like the problem is something more than just no amp driving the speakers. It's more a communications/networking problem that resolves with a reboot.

Sorry if this is terribly vague and un-specific, but I'm no expert in the car's electronics or car audio systems.

I suppose that if this happens again and more consistently, I'll try harder to figure out what's going on. One thing to try to note would be if the car's warning chimes (seatbelt off, key in/door open, etc.) still work while the audio is in "no sound" fault. I'm assuming that the amp drives the warning chimes too, so it may be worth noting if the chimes are there when the radio is not.

That said, if it IS the amp, I'd think that one could get a used one and install it for much less than $1300. I'd hope. Or for that price, you could upgrade the entire audio system.

[ctuna]

If you don't want to upgrade then
http://www.bmwgm5.com/Logic7_6941681.htm
if you have L7 sometimes upgraders sell there old one also.

If you have a Hi Fi you could upgrade to some nice stuff for the price
of the amp.

http://www.e90post.com/forums/showthread.php?t=641323

The head unit does not indicate which system you have.

[kavadarci]

I agree with jsunma, it is not no sound issue but processing\communication issue.
I have read somewhere which I can't find again that BMW dealership upgraded the sw version of the ECU and the problem was gone.

This to me is a "WINDOWS" problem.
Dedicated solution would be perfect.

[ctuna]

The BMW IBS has the ability to turn off some stuff if it detects a low battery this can cause a lot of confusion as it does it before you get a low battery indication. I have heard of the radio loosing its programming but a blown amp is more common. gbarba says BMW has diagnosed his problem as the amp.

http://www.google.com/url?sa=t&rct=j...rExtBDV6S9t6gw

[black 335xi]

Originally Posted by ctuna

The BMW IBS has the ability to turn off some stuff if it detects a low battery this can cause a lot of confusion as it does it before you get a low battery indication. I have heard of the radio loosing its programming but a blown amp is more common. gbarba says BMW has diagnosed his problem as the amp.

http://www.google.com/url?sa=t&rct=j...rExtBDV6S9t6gw

I just experienced the same problem, and it turned out to be a blown amp. (Base or Hi-Fi radio) I had also had an IBS code as well, so I thought that maybe I had lost programming or something due to a voltage drop. I know what you mean regarding the HU display options being more limited as well. Another board member here suggested that the blown amp had somehow put the HU into protect mode or something similar, thereby confusing the issue. I unhooked the amp (I had a little blaupunkt tha-555) with technic's harness, and reconnected the factory harness and it started working again. The amp had some kind of internal power failure when I had it tested. Also, there was a 2010 service bulletin regarding the RAD2 (or professional radio) losing programming and not being able to be re-programmed. Supposedly a hardware issue. Don't know if that's relevant for you.