Yep, 74 is the fuse for the telematic unit, which is the bluetooth unit for phone. It is a frequent cause of parasitic drain. Both times that it has occurred on my X was after an alternator death and battery drain. Replaced the alternator, charged the battery, but would have battery drain. After some research, I pulled fuse 74 and that solved the problem. I have seen disconnected and removed the unit as I wasn't using it anyway and I have now installed an AVin unit, so I really don't need it.

Yesterday and today were spent putting new parking brake shoes on and adjusting same and checking the fluid quantity in the ZF-slush-box and transfer case. And since I've been trying to track down a very occasional and seemingly random fuel cap loose message which hasn't gone away with a new cap, I yanked the right rear wheel well liner to check the fill/vent lines, and surge tank.

Happy to report that the fluids looked fine (although I know the transfer case needs a full change soon) and the plumbing under the liner looks fine as well. I will say, if you are a clean freak about your X5, don't pull a wheel well liner! 20 years of dirt, bugs, leaves, and other junk was waiting for me to clean out.
***update with a pic of the general area for posterity***
https://i.postimg.cc/VLJbMh0b/wheel-well.jpg

Next stop on my search for fuel vent problems is to pull the fuel filter/charcoal canister cover and get a look at all the lines/plumbing there. I have a new leak diagnosis pump and dust filter to install while I'm in there. I also want to pull the cover running under the drivers side of the car, from the filter forward to clean the area and look for rotted lines, loose connections, etc.

I think she's ready to drive to Iowa to chase some birds. She's been running strong and relatively drama free for several months...fingers crossed!

I spent the past two days installing a 10.25" AVIN Android head unit.


https://live.staticflickr.com/65535/...84136b37_b.jpg


It looks great and everything seems to work, except I have no sound.


I had a stock DSP setup, and according to everything I read this should be working, but I think the factory amp isn't turning on so I get no audio. Anyone hit this one before and have suggestions?

Common problem. You need a way to activate the DSP amp - via a datagram on the data bus, not via a wire etc.

I think the easiest way to do this is with the iBusApp and a Resler interface...

https://www.ibus-app.de/index_en.html

That looks fantastic. Very clean install.

Sweet! How much to install one in mine? Mine is simpler. No DSP! :popcorn:

When I installed my Avin unit, I tracked down a no-sound issue to the wires being loose in the back of the big square connector in the trunk. Pushed them into the brick, and all was good.

Also agree with what wpoll said. You'll need your iBusApp and a Resler interface situation sorted out, since that's what controls the DSP system.

I'm also running the Avin unit, and I suspected that was the source of the drain. Nope. #74 fuse was pulling 430 milliamps, and an acceptable level of total draw on the battery should be 50 milliamps or less. No wonder! Glad to hear it's kind of a known issue on the E53.

HAHAHAHA!!! :rofl:

No.

bought her a new idle control valve hope its a bit warmer when it gets here

setting several other codes and its not carboned up at all, but wont idle, seems like the logical starting point