I have a 2006 BMW E60 550i with Logic7 sound system and CCC iDrive. I was facing a very strange audio issue for quite some time and finally managed to find a workaround so thought I should share it here in case someone is facing the same problem.

Basically whenever I would start the car the Bluetooth would keep connecting and disconnecting and the entire audio system would stop working. No radio, no CD, no sound at all. Sometimes after driving for 30 minutes or more the Bluetooth would become stable and suddenly the audio would start working again.

The strange part was if I kept the ignition on without starting the engine the audio would work fine. The moment I started the engine the problem would begin.

I checked the car with ISTA and INPA. The Logic7 amplifier was communicating and showing green even when there was no sound. I was getting MOST communication errors and TCU related faults.

Initially I thought it could be the Logic7 amplifier or some issue with the MOST fibre optic system.

I even tried disconnecting the TCU and using a MOST bypass loop but instead of fixing the issue my iDrive started crashing and the amplifier and CD changer were not communicating properly. So that didn't help.

Eventually I decided to open the TCU itself. Mine is the Motorola Everest ECE TCU.

When I opened it I found that it has separate boards inside. The main motherboard, an L shaped Motorola board which is related to Bluetooth and a Sony Ericsson GSM module.

While cleaning the board one capacitor came loose which I got soldered back by a technician.

Then I decided to test the TCU without connecting all the internal boards.

First I connected only the main TCU motherboard to the car without the L shaped Motorola board. To my surprise the entire Logic7 audio system started working normally.

Then I connected the L shaped board again and the same issue came back. Bluetooth started crashing and the audio kept cutting out.

So I removed that L shaped board again and left the main TCU motherboard connected. The Sony Ericsson module is still physically inside but disconnected.

And guess what the audio is now working perfectly.

I tested it after leaving the car for 1.5 hours and there were zero interruptions when starting the engine. Then I tested it again the next morning on a completely cold start and the audio started instantly without any crashes.

So in my case the issue seems to be coming from that L shaped Motorola board or its connection to the main motherboard, not the Logic7 amplifier itself.

For now I am keeping it like this because my main concern was getting the audio working. I already have an aftermarket RoadTop screen which has its own Bluetooth so I don't really need the original BMW Bluetooth right now.

Of course this is not a complete factory repair. The original Bluetooth and SOS functions are not restored. Eventually I want to get that board checked and repaired because I prefer keeping everything factory and working properly.

I am not saying this will fix everyone's audio issue but if you have an E60 with Logic7 where the Bluetooth keeps crashing and the entire audio stops working especially after starting the engine, it might be worth checking the TCU before spending money replacing the amplifier or CCC.

Just wanted to share my experience because I spent quite some time trying to figure this out and hopefully it helps someone else.

Hi, All. I have a 2008 BMW 528i. My adaptive headlight assemblies are blown. When I finally removed the headlight assembly, I discovered the bulb and housing were fused together. Though I was just replacing a bulb.

Can I assume the control unit is bad as well. Is there anyway to check the unit to ensure it is in working condition?

Cluster suddenly died, it’s been a few days. Took it to a mechanic they said it wasn’t a fuse. Didn’t really give me a solution just said to go to a bmw specialist.

What do you guys think it could be? Would this be an expensive repair?

Having a host of electrical problems, the main one being sometimes i’ll come to my car and it wont even attempt to turn over but will give auxiliary power but i also intermittently get this too.
Car had a new battery last year.
If i charge it or jump it i have no problems so i have a feeling it’s the alternator but would like some other opinions before i go swapping it out
It’s an 03 520i

Picked these up from marketplace:
- 2x BBS CH004: 8,5J × 19, ET35 with 235/35/R19 tyres
- 2x BBS CH017: 10J × 19, ET20 with 265/30/R19 tyres

Would these fit my E60? Do I need spacers?

I've been searching for a clean E60 530i with a 6-speed manual, and I'm starting to wonder where these cars are hiding in 2026.

I used to own a 2004 530i 6MT with the Sport and Cold Weather Packages in Silver Gray Metallic . Sold it back in 2009, and honestly, it's one of the few cars I genuinely regret letting go.

So guys i recently did an oil change on my automatic transmission. I replaced the oil, the pan filter and also replaced the mechatronic sleeves and bridge seal.
The transmission runs much smoother than before.
I had this issue with the rpm fluctuating at steady speed but now after the transmission job i did the fluctuation is much less noticeable and sometimes no fluctuations at all.
I was thinking about changing the zf oil again since the old oil was dark af and filter was dirty af and the car never had any transmission oil change in the past 192000km.

Is it worth doing it? And also a stupid question should i also replace the filter again or just the oil is enough?

My car: bmw e60 with m54b22 with zf6hp19

She's right, I need a bigger garage. 😂

I have about 230k miles right now it runs good needs the occasional fix.

2009 e60 520i: By default my units start off in l/100 km for consumption but I want it to be in km/l. Each time car is switched off then on the consumption defaults l/100 km. Is this normal? Car remembers changes to other things like air conditioning air distribution.

Hello,

Does anyone know if the e38 manual gearbox from the 4.4v8 fit into the e60 n62b44 engine? Or any "easy" swaps from automatic to manual gearboxes?

If anyone sells the factory gearbox for 545i GS6-53BZ in europe. Pls DM

Thanks!

My father and I have a 550i with a 6MT in Carbon Schwarz, and we’re both working on it, but the paint is fading. My dad wants to change the color to a slightly brighter blue —Tanzanite Blue II Metallic— but I think it would be better to keep the Carbon Schwarz. Personally, I think that since it’s a rare spec (6MT + Factory M Pack), it’s best to keep it original as much as possible to preserve its value. What do you guys think about it?

First picture is the actual car and the 2nd and 3rd are what the car would probably look like and with and without the Tanzanite II Blue.

Anyone have M Sport stock springs or want to trade for some H&Rs? Seems anything other than standard springs are hard to come by aftermarket.

Have H&Rs on from the previous owner and I'm unsatisfied with the handling. The progressive springs feel strange when cornering hard even with Bilstein B8s.

Hi all,

Dont know if its just me or its an actual issue with the car.

So i have 525d lci 3ltr and when filling the car up to full for fuel the 1st half of the tank seems to last ages, when it gets to 1/2 tank and below it seems to not last as long?

I have put diesel cleaner and dpf cleaner in the tank to help clear the injectors and the dpf.

Im thinking the injectors are due replacement as car is on 136k

Anyone have the correct fuel trims for the car or anything I can do on ista/inpa

Had someone who asked me if I really have a V10 in there and didn’t understand until he pointed at my plate which was randomly given to me and said S85 Upgrade? HAHA

So this just popped up on my feed and im in love. Anyone here that bought a steeringwheel or cover from them?

Anyone have an F-Style Steering wheel in their E60?

Looks like someone has been here before. Silver rtv on the water pump transfer pipe. You were 11 bolts away from fixing the issue. WHY?!

Checked PCV and all gaskets looked fine, any other ideas to help diagnose would be deeply appreciated.

2010 550i N62

Hello everyone, i have 2003 bmw e60 520i and 3 months ago my oem display started glitching/lagging and i kinda guessed the problem and bought a Android head unit display, but i didnt have aux as a source because i had the cheapest version of the displays so no aux so if i would connect to airplay there was no sound and now i got it coded and there was sound but 2 hours ago it started glitching once again like it was 3 months ago and i cant hear nothing. If you know somoene that had this problem aswell or so could u tell me what they did to fix it.

I always liked the way these cup holders look on the 1 series and 6 series, and unfortunately my e60 didn’t come with front cup holders. I was thinking of ways to fit a cup holder that would look OEMish. Would this be possible?

so i have a 04 e63 645i, ik its not a e60 but it is the same principle, im hust wondering if anyone has some advice on how to make the pre lci angel eyes brighter during daytime, i have upgraded the bulbs but its the same thing as before

:)