Hi anyone point me where there would be a thread as to a 2008 bmw 330d m sport E93 convertible , it has I drive with top screen , then lower cd slot then lower again a dvd slot prob for nav disc,   But even when car keys are out of car I am getting loud cracking through all speakers on and off , when not cracking the radio etc is fine , both cd slot and dvd slot will play cd ok. So anyone know where to start there’s no amp it left back corner of boot , there’s a Bluetooth module thing mounted in boot below carpet but I don’t think it’s it. 
any advice welcolme.  

thank you 

Stevie. 

Morning

Welcome to the Forum

First take a look at one of the Vin Decoder websites to see what equipment was on your cars build list.Then look at www.realoem.com put the last 7 digits of your Vin into the search box it will call up your model. search the Audio system there are small exploded drawings that will give clues to where things are fitted. You will also have part numbers if you need to replace stuff.

Now your issue, you say there is no amp in the boot but I take it you have bluetooth if water has entered the area and the TCU has got wet that is an independent source of sound to the speakers. I would unplug it just to check if the sound stops.

Hope this helps

Dave

Thank you Dave , I have Bluetooth box below boot matt with 3 red plugs is the the module you think I should unplug. This is in boot. 
again thank you. 
stevie. 

I got this fault showing but not sure what it meant. 

Morning

First picture shows the TCU/Bluetooth unit pull the big multi plug if your issue stops you are pretty sure where the issue is.

Well its showing a TCU fault (TCU is the Bluetooth unit) That Fault seems to indicate the pairing button ? On my X5 the pairing button is under the armrest. If I recall on yours it is built into the radio, whether it is an actual fault with the radio buttons (they are multifunction buttons on the radio) or a fault with the TCU (seems more likely to me) Or possibly a loom issue (I hope not) its a long way from the boot to the radio. If the TCU is disconnected and the noise remains it would point to the actual radio headunit and button. My money is on the TCU

I am not aware of anyone who repairs BMW TCU units but that doesn't mean they aren't out there. Try talking to people like ECU Testing (Nottingham I think) or BBA Reman (Kent) there was also a company that specialised in upgrading BMW BM54 radio units. Google should help with contact numbers. If a test/repair isn't available then TCU's come up on Ebay and some of the specialist BMW recyclers should be able to help. Use www.realoem.com to get the Part Number click on the part number and it will give you a list of other models it was used in and alternate part numbers.

Good Luck

Dave

 

Thanks Dave will have to take back panel behind back seat off as the main plug must be mounted on the front of unit.  Strange thing bluetooth is fine connecting to phone. 

Pulled big plug fault still there wish I could find a fuse that would stop it 

 

Is it 1 speaker ? or both front speakers ?

Dave

Both speakers thanks , as soon as you open any door it starts then stops after about 1 minute then returns occasionally.

thanks 

Would removing all fuses from fuse box in glove box , and then replace them one by one do any harm to try to find the item that’s the problem. 
advice please. 
thanks. 

Laborious but would work and help isolate the circuit causing feed back. I would start with the audio circuits

Dave

Thanks I am going to do that , if none in the fuse box in glove box stopped it then I would know to move to another fuse box in bulk head 

On 12/14/2020 at 5:38 PM, Bmwm330d said:

Thanks I am going to do that , if none in the fuse box in glove box stopped it then I would know to move to another fuse box in bulk head 

AThanks I am going to do that , if none in the fuse box in glove box stopped it then I would know to move to another fuse box in bulk head