[S6K]

Hi all, I would love some advice troubleshooting this issue as I am not too experienced with electronics. Providing all information because I am not sure what is relevant and what is not-

Yesterday there was a huge storm in DC metro area which I got caught up in in my commute. Some standing water on highway but nothing crazy. Very heavy rain. Parked car, started it up 4 hrs later. 10 minutes into commute home I herd an audible zap noise followed by the iDrive system rebooting. After this iDrive showed "loading" when trying to reconnect to Bluetooth and USB. Nav screen stuck on "loading Navigation System". Radio works fine. Tried AUX connection and audio only plays through speakers on left half of car (may just be my AUX cable IDK).. fast forward..

Read codes through MHD platform- Cat underperforming (standard, I have hi flow cat), and O2 sensor short circuit (never seen this before, not sure if it's relevant or not).

Browsed forum. Tried resetting the iDrive via locking car for a few hours and through reflashing ECU. Every time the iDrive system boots for the first time there is an audible almost clicking type noise coming from box located under iDrive display beneath AC controls. Clicking noise only occurs when iDrive initially boots.

Pulled up fuse diagram and I see a good number of fuses in the box under the hood are dedicated to the front control unit. I have never tested or replaced a fuse before in any of my vehicles. Really praying it's just a fuse and not an iDrive replacement.

What would be your next recommended step for troubleshooting? Get voltmeter and check fuses? Or pull each fuse out and visually inspect? The diagram I sourced shows fuses 25, 120, 121, 122, 123, 125, 126, 128, 142, 147, 155, 159 from engine bay fuse box all dedicated to the control unit.

I can also provide a video of the audible clicking on iDrive boot if that would be of assistance.

Thank you so much for your help!

[steve@codemybimmer]

Sounds like the hard drive has gone bad in the iDrive unit judging by the click sound and maps not loading.

If this was a fuse issue, you wouldn't see the head unit turn on let alone display so I'd say your best bet now would be look into getting it replaced with a used one.

[S6K]

Originally Posted by steve@codemybimmer

Sounds like the hard drive has gone bad in the iDrive unit judging by the click sound and maps not loading.

If this was a fuse issue, you wouldn't see the head unit turn on let alone display so I'd say your best bet now would be look into getting it replaced with a used one.

Thank you

[S6K]

Originally Posted by steve@codemybimmer

Sounds like the hard drive has gone bad in the iDrive unit judging by the click sound and maps not loading.

If this was a fuse issue, you wouldn't see the head unit turn on let alone display so I'd say your best bet now would be look into getting it replaced with a used one.

Other people are talking about a combox replacement/repair, do you think that could be the issue or do you think a idrive replacement is more of what I'm looking at? Thanks for the help.

[steve@codemybimmer]

Originally Posted by kdevito757

Other people are talking about a combox replacement/repair, do you think that could be the issue or do you think a idrive replacement is more of what I'm looking at? Thanks for the help.

Given the model year and assuming that you have Nav, you have a NBT head unit so there would be no combox in your configuration.

Just replace the iDrive receiver and that will resolve the issue but keep in mind that you will coding and activation for Nav, Voice Control and Sirius XM to work again and we can help with that.

[S6K]

Originally Posted by steve@codemybimmer

Given the model year and assuming that you have Nav, you have a NBT head unit so there would be no combox in your configuration.

Just replace the iDrive receiver and that will resolve the issue but keep in mind that you will coding and activation for Nav, Voice Control and Sirius XM to work again and we can help with that.

Thanks so much I will definitely reach out for coding.... I did some research because I was confused and also thought my car did not have a combox with the NBT but after looking actually does, it has combox part number 84.10 9 377151 01

[steve@codemybimmer]

Originally Posted by kdevito757

Thanks so much I will definitely reach out for coding.... I did some research because I was confused and also thought my car did not have a combox with the NBT but after looking actually does, it has combox part number 84.10 9 377151 01

Are you referring to the 2015 335i M sport on your profile? BMWs from model year 2015+ would not have comboxes.

[S6K]

Originally Posted by steve@codemybimmer

Are you referring to the 2015 335i M sport on your profile? BMWs from model year 2015+ would not have comboxes.

Yes I am talking about that car, and all the research I have done says that it should not have one as well but look at the picture I took, is this not a combox? I looked up the part number on it and it pulled up eBay listings for a replacement

[steve@codemybimmer]

Originally Posted by kdevito757

Yes I am talking about that car, and all the research I have done says that it should not have one as well but look at the picture I took, is this not a combox? I looked up the part number on it and it pulled up eBay listings for a replacement

That is a TCB which strictly only handles telematics. A combox would not be part of your configuration given the model year and vehicle options you have.

[S6K]

Originally Posted by steve@codemybimmer

That is a TCB which strictly only handles telematics. A combox would not be part of your configuration given the model year and vehicle options you have.

Ok thanks so much for the info, just wanted to double check. I will try to locate a used idrive unit for purchase and reach out when I'm ready for coding. Again, thanks for all of your help!