[Chigga]

Originally Posted by ctuna

Step one there is either power to the Radio or not
Radio has a fuse on the back and one in the cabin fuse panel.
If you have a low battery the IBS may be turning off power
to the Radio.
If you have done the above checks and there is power on the
Radio connector and it doesn't turn on then its the radio.

IBS system can turn accessory's such as the Radio off if it
detects a low battery or is defective.
Read first pdf

electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU

Ctuna, I did all that on a 2006 323i, but the radio still refuse to power on.

- Had new battery, coded.
- The lights come on around the stereo,chime works etc.

But the radio just won't power on, even swap out to another known working unit, still won't power on, then bought the aftermarket harness and swap it to an aftermarket head unit that was working, it's not powering on, so I'm bit at loss here, why wouldn't it power on? I check all the fuses and everything seems fine, I just can't get 12v power to the headunit.

Any help would be great.

[ctuna]

Follow the Voltage. There should be 12 Volts at the Radio Fuse behind
the glove compartment.(on one side of the fuse with the fuse pulled and at the back of
the radio harness with a good fuse in place)
Also you should have zero ohm between the Radio Harness 12 volt line and
from one side of the fues to the radio harness 12 volt pin.

Are you trying to put the factory unit back in or install something new?
Is it the stock harness that is having trouble with the stock radio?

[Chigga]

Originally Posted by ctuna

Follow the Voltage. There should be 12 Volts at the Radio Fuse behind
the glove compartment.(on one side of the fuse with the fuse pulled and at the back of
the radio harness with a good fuse in place)
Also you should have zero ohm between the Radio Harness 12 volt line and
from one side of the fues to the radio harness 12 volt pin.

Are you trying to put the factory unit back in or install something new?
Is it the stock harness that is having trouble with the stock radio?

Hi ctuna.

Got the car couple months ago that needed TLC, sorted out everything except now just the stereo, all the fuses on the board has been replaced with new ones.

But the factory headunit would not power on, the fuse in the back is good, the lights around the headunit would light up, thought was an issue with the headunit being dead so swap out to an aftermarket Alpine headunit from my E30 that was working fine, but notice it would not get power to turn on, there's no power in the 12v battery and 12v ignition wire.

Then swap to new battery, coded accordingly, but still no power.

Truly at a loss on this one.

[ctuna]

"But the factory headunit would not power on, the fuse in the back is good, the lights around the headunit would light up, thought was an issue with the headunit being dead so swap out to an aftermarket Alpine headunit from my E30 that was working fine, but notice it would not get power to turn on, there's no power in the 12v battery and 12v ignition wire.

Then swap to new battery, coded accordingly, but still no power.

Truly at a loss on this one."

Measure the 12 volt line from the back of the Radio connector to the Fuse with and ohmeter.
Do the same for ground line on the to ground from the back of the radio connector to chassis ground.

Possible the relay that control's power to the radio in the fuse board may not be switching.
Read the first electrical pdf

You should be able to measure power and ground at the back of the connector .
Since you used a aftermarket radio did you have a harness to make it work or did you hack
up the factory harness in the car?
Did someone else hack up the factory harness?
Why would you think the harness pinout would be the same between an older car and a newer car?

There are two fuses the one on the back of the radio and the one at the fuse board behind the glove
compartment.

head unit
http://www.e90post.com/forums/showth...ight=head+unit
http://www.e90post.com/forums/showthread.php?t=1457320
http://www.e90post.com/forums/showthread.php?t=1036190
http://www.e90post.com/forums/showth...hlight=dynavin
http://www.janus-design.net/english/
http://www.e90post.com/forums/showthread.php?t=355089
http://www.e90post.com/forums/showth...ight=head+unit
http://www.e90post.com/forums/showth...hlight=dynavin
http://www.e90post.com/forums/showth...hlight=dynavin
http://www.e90post.com/forums/showth...light=retrofit
http://www.e90post.com/forums/showthread.php?t=993447
http://www.e90post.com/forums/showthread.php?t=1016187
https://www.bmwgm5.com/Logic7_E90_91_92_93.htm
http://www.e90post.com/forums/showth...hlight=dynavin

[alz.s7]

I've had the same problem with my radio on my lci e92, it just randomly stopped working and is now blank. I've tried to buy and fit and new radio but this still hasn't fixed it. Could this be a fuse and what one would it be? Ive also tried the fuse behind the radio and some others in the glove box.

[ctuna]

https://www.google.com/url?sa=t&rct=...,d.cGU&cad=rja

You need to measure the voltage on the line that feeds the Head Unit and follow it back.
BMW diagnostics like Inpa and Ista D would help.

[Bmwguyosk]

Edit: I have solved/fixed the problem

The problem of having no power to the fuses that power the radio-
The fix for me was - if replacing the fuse box to a new one,
Dont forget these 2 fuses. (Pic in attachment) zoom in!
Black lookin fuses deep in the fuse box.

Originally Posted by ctuna

https://www.google.com/url?sa=t&rct=...,d.cGU&cad=rja

You need to measure the voltage on the line that feeds the Head Unit and follow it back.
BMW diagnostics like Inpa and Ista D would help.

Im doing some diagnostic on my brothers 328xi 2009 e90
Car had no power what so ever.
Replaced ground strap under front wheel(was completely broken)
Replaced b+ wire and fuse box.

Car works mostly

Now the radio wont turn on. Most fuses are 12v+, but no 12v to the fuses that supply to the HU (tested connector behind HU and fuses) im getting 353mV back there

Tried with and without Ibs plugged in

everything else is working

Still no luck. Whats next in line to the HU power connector, is it directly to the fuse 14?
The fuses are not showing 12v

Thanks ahead of time if you take the time to read this^^

Oh, i also have Ista + , inpa, multimeters, and so on.

[moxxoff]

Originally Posted by ctuna

"But the factory headunit would not power on, the fuse in the back is good, the lights around the headunit would light up, thought was an issue with the headunit being dead so swap out to an aftermarket Alpine headunit from my E30 that was working fine, but notice it would not get power to turn on, there's no power in the 12v battery and 12v ignition wire.

Then swap to new battery, coded accordingly, but still no power.

Truly at a loss on this one."

Measure the 12 volt line from the back of the Radio connector to the Fuse with and ohmeter.
Do the same for ground line on the to ground from the back of the radio connector to chassis ground.

Possible the relay that control's power to the radio in the fuse board may not be switching.
Read the first electrical pdf

You should be able to measure power and ground at the back of the connector .
Since you used a aftermarket radio did you have a harness to make it work or did you hack
up the factory harness in the car?
Did someone else hack up the factory harness?
Why would you think the harness pinout would be the same between an older car and a newer car?

There are two fuses the one on the back of the radio and the one at the fuse board behind the glove
compartment.

head unit
http://www.e90post.com/forums/showth...ight=head+unit
http://www.e90post.com/forums/showthread.php?t=1457320
http://www.e90post.com/forums/showthread.php?t=1036190
http://www.e90post.com/forums/showth...hlight=dynavin
http://www.janus-design.net/english/
http://www.e90post.com/forums/showthread.php?t=355089
http://www.e90post.com/forums/showth...ight=head+unit
http://www.e90post.com/forums/showth...hlight=dynavin
http://www.e90post.com/forums/showth...hlight=dynavin
http://www.e90post.com/forums/showth...light=retrofit
http://www.e90post.com/forums/showthread.php?t=993447
http://www.e90post.com/forums/showthread.php?t=1016187
https://www.bmwgm5.com/Logic7_E90_91_92_93.htm
http://www.e90post.com/forums/showth...hlight=dynavin

If the idrive screen is exposed, would it cause the radio to turn on and off?
The Ac/Dc fuse?
On mine the whole idrive screen is taken apart and i drive with it like that, but also the xdrive is throwing a code... so when i drive and hit a bump (the suspension is no bueno) the radio turns off and completely resets. Battery/fuses are ok.

xdrive sensor near bad suspension is ok

I read that the fuses on the back of the screen can cause issues as well, but everytime i put in a new screen/check it, nothing changes the issue

[karlsharpe33]

Finally cracked the no radio today in the E90, frustrated the hell out off me for three solid days but now i have it working again, request info if in the same position.

[Clique]

Originally Posted by karlsharpe33

Finally cracked the no radio today in the E90, frustrated the hell out off me for three solid days but now i have it working again, request info if in the same position.

Hi, I'm having the same problem I've changed my aftermarket head unit swapped it to my old one still no power checked all fuses and IBS every thing seems fine ac has power but still no power to my head unit. I also changed the battery.

[blackknight]

Having issues with intermittent power, what do you think is the right procedure to check what is wrong with the radio.

Same radio in the picture from original post

[blackknight]

Originally Posted by 90SLOWE

I turned on my car yesterday and I have no power on my radio. I do get the sound warning for the passenger seatbelt / open doors.. etc so the spearkers work but I have no power on the radio/cd player console. The display on the console also does not work. I tried all other electronics including the AC and AC display, they all work fine.

I read a couple other posts about this problem but could not find a solution. Please help.

2006 E90 330i, no iDrive

were you able to fix the issue, we have the same problem, you only had it earlier.

[ctuna]

On some 2006 e90's there is a separate speaker for the alarms.
the first thing to do on cars that have an amp is to check the amp
is not drowned by water leaks.

Do you mean the Instrument Cluster. (does it have power)

[blackknight]

Originally Posted by ctuna

On some 2006 e90's there is a separate speaker for the alarms.
the first thing to do on cars that have an amp is to check the amp
is not drowned by water leaks.

Do you mean the Instrument Cluster. (does it have power)

the cluster has power, only the radio can not be turned on. Everything works, except the radio. When the head lights is switch on, the back light for the radio switches on. This power of the radio is intermittent, some time it works some time it does not. Usually after a restart it may work or not.

I have not checked the fuse though, but when the fuse is blown, then it should not be intermittent. I am leaning on the battery side but it is quite new around 2 years.

where is the amp located?

[ctuna]

BMW stereo types
http://www.e90post.com/forums/showthread.php?t=352586
http://www.e90post.com/forums/attach...2&d=1266451970
http://www.e90post.com/forums/attach...2&d=1260829447
http://www.e90post.com/forums/attach...1&d=1209780865
http://bmwcoders.com/forum/3-er-8/bm...1-e92-e93-291/
http://technicpnp.com/menuDiagrams/d...e90_92_93.html
http://www.musicarnw.com/page-2/
http://www.e90post.com/forums/attach...3&d=1169133185
http://www.e90post.com/forums/attach...1&d=1209780605
http://www.e90post.com/forums/showthread.php?t=641323
http://www.e90post.com/forums/attach...4&d=1278871872
http://www.e90post.com/forums/showthread.php?t=343673
https://www.bimmerfest.com/threads/e...n-752.1275694/

base system wiring pre/post 3/09
https://www.google.com/url?sa=t&rct=...tDpLJPcGkw_ui_
Base System Guide
http://www.e90post.com/forums/attach...5&d=1493273253

[Colined]

Originally Posted by karlsharpe33

Finally cracked the no radio today in the E90, frustrated the hell out off me for three solid days but now i have it working again, request info if in the same position.

Hi all, what is the permanent fix for this issue?

In my car when I disconnect the battery the issue goes and radio works then over time it reappears, sometimes it stays on and can only switch off with disconnecting the battery?? Any help much appreciated

[ctuna]

Have you actually measured your battery voltage when this occurs?
Does this happen with certain weather conditions?
If you have an amplifier in the trunk have you checked it for water intrusion?

[Colined]

Originally Posted by ctuna

Have you actually measured your battery voltage when this occurs?
Does this happen with certain weather conditions?
If you have an amplifier in the trunk have you checked it for water intrusion?

Hi it's been happening since mid December. The battery has been tested and also given a boast charge so not sure what else could be? I noticed some water under the battery which I think is a small leak, this has been dried but no change.

[ctuna]

I would measure the voltage at the Radio .

When you say something is good it's not the same
as measuring it.

If you can't switch it off sounds like a problem with the Radio.
CD 73 Radios can be had on Ebay but they most often need
to be programmed to the car.

[GSB]

I have found two other causes of "no power to the radio". Neither of these are caused by fuses or the battery. The radio is still powered up, but totally unresponsive, with a blank display.

The first, is the Roof Function Center (FZD) console, contaminated by a thin haze of road pollution and/or moisture. The FZD carries signals that mute the radio, and in my case, also shut off the radio display and controls, even though the radio was still powered up.
FIXED: This Circuit Board Can Cause Several Serious Malfunctions!

The second, is that contamination or corrosion in the Amplifier ECU can cause data corruption and communication issues that send the radio into a non-responsive state, locked up with no display and no controls, even though ALL modules in the system return zero error codes. The amp can disappear from the system as if it isn't connected, returning no error codes, yet simultaneously locking up the radio head-unit.
Another Frustrating Cause (and Fix) for the Audio Glitches!

So clearly, there are OTHER hardware/communication issues that can trigger the same unresponsive state that you might expect from a blown fuse. In my links, I've posted fixes to both of those issues. For me, the most intolerable symptom, was loud crackling from the speakers, but a dead radio was also experienced in both cases. To make matters truly aggravating, replacing the radio may not fix the problem, because the radio is receiving this shutdown state/command from somewhere else.

[Captain Buumer]

Also the electronic components just die due to poor design. It's already proven that BGA chips have limited lifespan due to thermal stress on soldering balls if thermals are not taken care of.
Sony PS3 have this problem and well documented. They messed up the layers on the PCB itself and the solder joints basically cracked after heat cycles and gave you yellow ring of death due to no connection with chips.
Older e9x BMW modules are build about the same timeframe and probably suffer similar design flaw at smaller extent due to less heat produced.

Personally, i hate the BGA-s. While very efficient on space they are super annoying and time consuming to replace properly. BGA machine needs the custom program and controlled environment room. Additionally more complicated to check soldering (need to use Vectorless technology). Functionality testing is no different from other active components but the fault management and which node is open is a big job to write. Boundaryscan that is another layer of complexity but quite efficient.
Sure, there is X-Ray but it means manually need to examine them 1 by 1.

My M-ASK unit screen power circuit just died. No voltage going to the screen. So it's not rare problem and probably some simple voltage regulator overheated and died. Didn't bother to investigate since rarely find these old units for reasonable price.
I was surprised BGAs didn't have any heatsinks while the components got significantly warm. In that small box the heat is trapped and slowly cooking them up.
While it may survive the heat it is guaranteed not to last because of the couple cents BMW saved by not having heatsinks.
My unit fan was stuck - probably why it overheated and died.

[GSB]

Oh boy, yes, those tiny fans do not have an unlimited lifespan, and the solder joints on those BGA chips are certainly looking for any excuse to fail.