High battery drain

[icebob]

First, hello everyone! I'm a new owner of a 2010 X5 30i. I noticed when thew car sit overnight, I get the High battery drain warning. Noticed the other day that when in the house, car in the driveway all locked, I made a phone call with my cell and I had no audio. Look like the phone was still connected to the car bluetooth Not sure why with the car off and locked that system was still alive. Found that fuses 110 and 136 are related to phone. pulled both fuses yesterday and this morning no high battery drain warning. I'm getting a SOS system malfunction, which I'm sure is normal since the fuses are removed. I left the fuses out for a week and never got the message. Put them back last night and got the message again this morning. Any idea? Thanks in advance.

[icebob]

Last night, I put fuse 136 back in and left 110 out. Got the high battery drain warning this morning.... When I got to work, I swapped the fuses so now110 is in and 136 is out. The car should be sitting for about 10hrs... I'll see what happen when i get out later...

[icebob]

Nobody?

[Nanniepoo]

When was the battery last replaced?

[icebob]

Don't know, just know it's an AGM battery

[ard]

If some module keeps waking the car up, the phone/bluetooth stuff gets woken up with that-

they may NOT be the culprit in the drain. Your pulling the fuse just keeps them from waking up- but it may indeed be something else that is triggering things.


newtis.info

there should be some docs on how to diagnose parasitic drain...

[icebob]

ok with fuse 110 in and 136 out, I don't have the high battery drain warning. I need to know where power to 136 is coming from and where it is going to....

[icebob]

Originally Posted by ard

If some module keeps waking the car up, the phone/bluetooth stuff gets woken up with that-

they may NOT be the culprit in the drain. Your pulling the fuse just keeps them from waking up- but it may indeed be something else that is triggering things.


newtis.info

there should be some docs on how to diagnose parasitic drain...

Thx for the newtis.info link, That will help a lot.
Now to figure out what the combox do...!

[icebob]

I'm not familiar with BMW symbology on their wiring diagram. I need to find out what are the condition for that contact to close, (My guess it's a relay)

https://ibb.co/dPieSp

[icebob]

I don't have combox, I have TCU, I checked the relay that feed F136 and work fine on the bench. I also noticed that X1 on that relay is powered with the car off. I need to check tonight when I get home with the door locked,and trunk closed if that relay is still energized. I cannot find what in the junction box is feeding X1 on that relay...