SOLVED:: Battery drain; no sleep mode
 

I'm chasing a residual current draw that keeps my X from going into sleep mode. After having pulled ALL the fused from the glove box and the cargo area, I'm now at the high amperage fuses and found one that seems to be the guilty guy, but I can't find the designation of those fuses. The suspect wire goes on the left side, under the rear seat, and toward the front of the car.

Anyone has this info? My X is a 4.8is with the 2 axles air suspension, and I think the fuse block is different than other models.

Thanks.

http://i16.photobucket.com/albums/b5...Block72dpi.jpg

Here's a link to the BMW WDS (wiring diagram system)...the high amp fuse box contains fuses F200 - F207. Fuse 200 is the 200a fuse at the very top, then F201-F207 go from bottom (F201) to top (F207): http://www.bmw-planet.com/diagrams/release/en/index.htm

Thanks Qsilver7.
I already tried but with Chrome I can't zoom in, so I don't see anything, and with IE8, the diagram doesn't display. I have the latest version of Java btw.
:dunno:

I'm not sure what you're asking...if you can rephrase it...perhaps I could be more helpful.

You mention you may have found the fuse? or wire? ...which one is it? The very bottom fuse is F201...and the top one is F207. The large 200a fuse is F200.

BTW...be gentle...electronics is not my strong suit...I know just enough not to fry myself...or what I'm working on...which means if I don't know what I'm doing...I step back slowly and walk away. :)

Ah, ah, sorry if I was not clear. I was looking for the meaning of those high amps fuses, but couldn't access DWS from my home computer.
I'm now at work, and I am able to view, zoom, move the diagrams.

I found the fuse references you are pointing me to (F201-F207). I read the diagram and found the meaning of each fuses, so I updated my picture.
When I disconnect the 3rd small wire from the top (Transfer box control unit) the current leak stops. It's the first time I ear that this module causes a problem. I will investigate more tonight.

Thank you.

http://i16.photobucket.com/albums/b5...locklabels.jpg

Great...glad you found the info you needed. :) :thumbup:

Just a thought (which you may already concluded or looked into)...since that 3rd wire supports the control module for the transfer box...and since the transfer box is electronically controlled (and below the vehicle)...could there be an electrical short of some kind on the transfer box that is causing the control module an issue?

Good suggestion, my next step will be to examine the box itself under the rear seat, then jack the X and look the the connections. Hopefully it will be simple, e.g. not expensive...

Right now I`ve put back all the fuses (glove box and trunk) exept for that wire. The X goes into sleep mode (20-30mA) but not after 16 minutes, but more like 25-30. Well, I`m borrowing a Fluke meter with MIN/MAX recording capability and a DC current clamp and will work this week end and hopefully will find the cause. Right now I drive my daughter`s 2000 Corolla. It does the job, but, how could I say that... umm, it`s not the same as a X5 :D

After many 16 minute wait to isolate the current draw that kept the X going into sleep mode, I found the problem.

THIS:

http://i16.photobucket.com/albums/b5.../Boomerang.jpg


This is a 'Boomerang' (tracking system) that was installed by the PO under the rear seat on the left side. I didn't know that system was there. The problem is the rechargeable battery that is partially shorted. It doesn't go higher than 2.3V so it creates a constant current draw on the 12V system. In my case, they used the transfer case control box 12V supply. I removed the tracking system, and now the X goes to sleep at 30mA after 16 minutes.
I'm lucky it was not a defective module though. So it cost me only my time! :bmw:.

Excellent chase. I bet you just helped a few guys who's cars wont go to sleep.

Wow! Great job tracking that down!