Hi guys back again i posted about 10 weeks ago with error on the dash 4x4 dsc ebv abs failure had loads of faults come up alot where kcan line communication took it to the garage and it's been there for the last 9 weeks they changed the transfer case module and the dsc module and it cleared the faults but when they started the car 1 air bag wouldn't inflate so they decided to change the airbag and the compressor once they've done this they start it up again and both airbags won't In flate they said they plugged it back in and it yet again has kcan line faults so they've decided to change the bcm module but that has done nothink im lost with this car and it seems the garage are just chucking any random module at it they have said there is 7 more modules on the kcan line they can try but my bill.is racking up any help I would appreciate 

Morning Steven 

I actually posted pictures of the cause for K-bus faults 

The problem is in the boot mainly so the first thing needed is to fix the bus faults, only then will you be able to clear down faults and find the cause of the issue if indeed you have one. Then of course there is the uncomfortable conversation with the garage about who should pay for all the unnecessary works and component changes.

So again

In the pictures you can see cable splices in the main wiring loom in the boot the loom is located on the boot floor below the Fuse board in the right hand cubby you will need to remove a bit of trim to get to it 

BMW make these splice/joints by twisting and compressing the join then covering it with a clear plastic sleeve. Moisture gets in and the black stain you see through the clear plastic is corrosion. The pic Cable splices shows the K-bus on the left of the picture Yellow/green Orange with mine they just fell apart so I remade them with soldered joins and shrink wrap after digging I re-made all the joins you see in the pictures 

That is where you need to start 

Your Garage seem clueless show them these picture tell them that is where the issue starts and hopefully ends then they can clear the K-bus and you may have a chance of sorting any issues that remain. If the control units they have changed have not been registered to the chassis they may need doing but start with the K-bus

Personally I would DIY so you know its done

Dave

 

Hi Dave hope your well i mentioned it to the garage when u told me last time and they said they looked fine but when I looked in that rear compartment you could tell water had been in there im going back up there tomorrow to show them your post and just get them to sort them just to eliminate this problem as theve had the car roughly 9weeks and im over 1000 pound in on parts and labour

Good luck Steven

Key is getting the K-bus faults cleared then work through the others if they still show. Important point make certain the Battery is in good condition and fully charged

Dave

Hi Dave manged to spk to someone from the garage today and apparently they've done the dealer splice in the back but the problem is still there less kcan line faults from before but still kcan line faults present I did replace the battery before I took it to the garage and I got someone to register the battery as I was told i needed to do that but after I replaced the battery it was like somethink was draining it and occasionally struggled to start as it had low voltage  so we checked the altonator voltage and that was fine

If the splice has been repaired properly, there are K-can High (Orange/Green trace) and K-can Low (Green) both need doing then it should clear , I know I have done a few. Then you have the Chassis Can (ICM) which has its own can High and can Low, the DSC has PT-can links High and Low 

Then common sense dictates you have an issue with other K-can splices there are several in the Main Loom floor level and under the dash

I would either check myself or find a another Garage bearing in mind this is the garage that has taken £1000 of your money every time telling you "this will fix it".  If you can't be bothered yourself get an Auto Electrician as all your doing is throwing money at it/them. It really isn't that complicated 

Sorry if that sounds harsh but it's your car and money just go back to your very first post and see the answer/advice given

Dave