Good job! Must feel great to finally find that, especially finding out it's not some expensive module that is out of stock anyway. :)

turbo is that an aftermarket item or do all x5`s have a tracking system?

It is an aftermarket item, sometimes required by insurance companies on expensive vehicles.

And yes, the chase was long, but it's a good feeling to find something at the end.

how would you know if you had that unit installed ? would you have to look under the seat?

Usually the installer tries to hide the unit. On my ex-E46 Touring, there was one hidden in the cargo area, behind the left access door, and pushed toward the front so it was not visible when you just opened the door. They are installed inside the car, not in the engine bay nor under the vehicle (too harsh conditions). To know if you have one, I think the only way would be to search inside the car, or contact the previous owner(s)... or make friend with a cell phone tower tech and ask him to 'listen' with to your car with his instruments in search of a transmitting signal...

k cool what ever made you look by the back seat or where you just going to check the module out thats there? its awsome that you found your problem.

I looked under the back seat because in the schematic, the 3rd wire was the supply for the transfer box control module, and WDS was showing that this module was under the back seat. I was going to check for corrosion on connectors, damaged wire, but found this unit beside.

I guess you had some luck on your side since they can put these tracking devices anywhere.

Well, yes and no. By pulling the fuses one by one, I isolated wich circuit was draining too much current, so I had to follow the wire and examine around the module on that circuit. But I agree that if you just look for it without having a problematic unit, it may be hard to find.

Turbo bimmer great help, my problem is similar, but car does sleep though,so whilst x5 slept I checked all the fuses in the glovebox all read 0.00 when i set the digital mulitmeter to 10a (sorry i am a novice) and i checked the easily accessible fusebox in the rear compartment, judging by your post do i need to raise the floor matt in the trunk and look for those high amp fuses n test? I am still waiting for a reply from company who installed the gps for previous owner but hid it well......how easy was it to rip out rear seat so i can check if i have anything supspect installed?