Could anyone urgently advise what the 2 white boxes located in the spare wheel well are for?

One has a single plug and is located towards the front of the wheel well, and the other has three plugs and is located towards the back of the wheel well.

I'm really interested in the single plug box as this was sitting in a puddle of water created from condensation in the boot!!

Thanks,

 

the single box controll the idrive , instrumental cluster... dont get that wet or else u will have electrical problems..

 

And that's exactly what I have got.......electrical problems!!!

I-drive has gone down; no screen, no radio. Do you know how much it costs to replace this box?

 

i think i paid 120-150?? for that small unit =/ but hey if it fix the problem then i guess its worth every penny,after i bought the new one i relocated mine to a safer spot =]

 

did it fix all your issues? or did you have to reset it all

 

fix everything to the cluster and idrive- when i replace it the dealer told me to come back so they can reset it for $100, i told them ill be back tomorrow and i never came back. my car is 100% no problems just another plug and play =]

 

Looks like you have a problem with the MPM (Micro Power Module...)

Take a look:
https://5series.net/forums/index.php?showtopic=82909
https://5series.net/forums/index.php?showtopic=81052
https://5series.net/forums/index.php?showtopic=67482
https://5series.net/forums/index.php?showtopic=44813
https://5series.net/forums/index.php?showtopic=44245
https://5series.net/forums/index.php?showtopic=43175
https://5series.net/forums/index.php?showtopic=39423
https://5series.net/forums/index.php?showtopic=21359

 

Thanks for the info. The car is booked with a local dealer so will point them in the direction of the white box.

When I removed the spare wheel I found the white box sitting in a puddle of water a third of the way up the side of the box. I opened the box to find water inside and the PCB covered in muddy sludge. Furthermore, the wires running into plug that fits in to the box are badly corroded. It must have been sitting in water for a long time. I'm amazed the I-drive hasn't stopped functioing before now.

It's a really bad design as once the water has collected around the box there is no-where for it to drain to.

 

I read all the posts about the MPM and understand that it is related to the I-drive system - but what does it actually do?

Does it provide / manage power to the CCC (the white or black box with the 3 plugs attached, I asuume) or does it do something else? If so, what?

 

You must have missed this particular post embedded in the links I provided earlier:

https://5series.net/forums/index.php?showto...mp;#entry438016

Although it doesn't explain things in great detail, it does describe how the MPM functions. (It also explains that after 9/2005 production, the functionality was integrated into a different module so the "faulty design" of locating it in an area that could get wet was remedied.)