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  #1  
Old 05-31-2020, 10:32 AM
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No Bluetooth Audio and Phone - Blown Fuse, Plz help!

Hi All,

Just registered and posting hoping that someone might be able to shed some light on the following and offer some help:

Background:
2010 BMW X5 E70 MSport (UK) CIC iDrive
Paired phone (iPhone 7 plus) when I bought the car in August 2018, picks up phone automatically as expected (the happy days) and continued to do so for about 18 months.

Then at some point in the last 4 - 6 months Bluetooth for audio and phone pairing becomes intermittent. sometimes it automatically finds my phone and sometimes it does not!

Now phone and car never pair at all for audio or telephone whether automatic or forced i.e. looking to pair phones again from scratch.

Having done some Internet research I tried a couple of easy things:
1) Deleting all unusual characters from contacts and removing the '+' symbol on international numbers - I found this on a forum and YouTube video and was desperate to try anything.
2) Checked the fuses.

Upon checking the fuses (in the boot) I noticed two things:
1) The fuse rated a 5, in position 110 was blown (see the fuse circled red in 'Fuses.jpg', apparently this covers the following - see 'fuse110.jpg'.
2) The relay circled in green, on the same fuseboard - see 'Fuses.jpg' is very hot, even after the car has been off and stationary for a while.

I thought great I'll just replace the fuse in position 110 and I'll be good to go, WRONG, it immediately frazzled another fuse.

So now I'm thinking OK let's check the items (where applicable) that fuse 110 manages, now the only thing I can check are the luggage compartment lights and they are both corrosion free and bulbs still in place and not blown. So this is where I run into problems... I'm not a car electronics expert, not even close, so I don't know what to do next, so if anyone has any ideas please do let me know..!

In the meantime I've ordered a box of spare fuses and a mini OBD fault finder thingy, I think this was out of desperation as having audio from my phone to the car is very big deal for me.

Also, I've disconnected the battery for the length of time it takes me to write this - about 30 mins and then I'm going to reconnect, reset the computer and see if I can insert a new fuse without it blowing, this is me hoping that there has been some kinda ECU / ULF bug and it just wants "turning off and on again!"

One other thing that I think is coincidental, but I got myself an Apple Watch about the same time this started happening but I have tried testing this theory by not wearing my watch in the car or switching the watch off and it made no difference, however the 'damage' might already have been done. Also I just wanted to mention everything in case someone goes "Ahhhh" we've heard this before.

Any help at all GREATLY appreciated.


Cheers, Nick
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  #2  
Old 05-31-2020, 12:16 PM
ard ard is offline
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Schematic for Fuse 110:

https://www.newtis.info/tisv2/a/en/e...-fuse/DjVDRgEi

Using a meter (ohmmeter) you need to confirm that there is a ‘ground’ somewhere. The other side of fuse 110 is probably ‘0 ohms’ to ground.

Looking at the schematic, find every connector. Disconnect each until the meter changes. THAT will tell you where the issue is. Could be a failed module somewhere. Could be a chaffed wire now shorted to ground.
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Old 05-31-2020, 04:24 PM
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Many thanks for the steer on what to do and also the schematics.

Once I've had time to do this I'll come and post an update.

Cheers, Nick
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Old 05-31-2020, 10:08 PM
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The combox power connector is on the left edge of your blue circle with about 15 wires going to it. Press the tab and rotate the lever to disconnect it.
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Old 06-02-2020, 09:05 AM
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It turned out there was the remnants of a (literally) ripped our phone cradle, the type that sit in the centre dash box (with the double doors) and the previous keeper had badly taped up the ends and stuffed them behind the broke cradle through a hole, this was a fire waiting to happen!

Anyway I stripped off the interior side panels of the centre console and chased the cable back to its proper connector and disconnected it and replaced the panels.

I've also replaced fuse F110 and it has not blown. However, there is still no Bluetooth, I just get the 'please wait' message forever if I try connecting via audio or telephone, also my phone does still not find my X5 in the list of available devices , it's as if the car does just not have bluetooth at all.

I'm going to check all the other fuses again but I'm starting to think the Bluetooth module, which I believe is in the form of a 'combox' has failed. There is a pic of this 'combox' in my original post circled in blue, could someone let me know if a)that is a combox and b)does the combox control the bluetooth on the BMW X5 E70 2010 (LCI)?

Thanks again, Nick
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Old 06-02-2020, 09:58 AM
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Your picture shows a combox with a bluetooth antenna and usb cable hooked to it. Run your vin here to get more details. https://www.mdecoder.com/

Was your dash removed for the passenger side airbag repair? Sometimes the dealers forget to plug the bluetooth antenna back in.
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Old 06-02-2020, 12:42 PM
ard ard is offline
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Quote:
Originally Posted by smassey321 View Post

Was your dash removed for the passenger side airbag repair? Sometimes the dealers forget to plug the bluetooth antenna back in.



He's in UK... which side?


Still, it seems to have degraded over time.... but yes, worth an ask.
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Old 06-04-2020, 04:45 PM
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Thanks both, since I've had the car it's not been in to have the passenger air bag check, thanks for asking though.
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Old 06-04-2020, 04:52 PM
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UPDATE - Basically I thought I'd try using the OBD scanner I bought, this was a CARISTA branded one with an app on iOS or android, not long after I plugged this in and started scanning the ECUs (sorry if that's the incorrect terminology) the bluetooth module magically came back into existence - HURRAH...

Alas, it was to be short lived as whilst I took the car out for a road test with Bluetooth tunes yesterday and all was good, today it is now not working again, ...

I can only surmise electronic gremlins and I can't see a way to fix it without getting an in car electrics specialist at this point, seems a bit impracticable to plug the OBD scanner in every time to kick start the combox.

If anyone has any more ideas I'd be more than happy to here them!

On the plus side, this means the combox is not a complete dud (I think).

Thanks, Nick
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Old 06-05-2020, 10:05 AM
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Now that you have solved you power issue, go back to basic BT troubleshooting. Delete all the paired devices from both your phone and car and then re-pair. I had to do that after the most recent IOS update.

Also, you may want to do the BMW bluetooth software update available here. https://www.bmw.com/en/footer/software-updates.html
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