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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series & 8 Series > 7 Series - E65 / E66 (2002 - 2008)

7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 05-21-2010, 10:10 AM
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DLF750 DLF750 is offline
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Alarm system and comfort access screwy lately...

OK, so lately when i've been going to open my door, which is locked, with the key fob in my pocket, door won't unlock. Sometimes it does, but usually not. I can still open the locks and close them with the button on the key, so it's not the battery, I don't think.

Now, when I do lock the doors with the fob, the alarm doesn't chirp and the lights don't flash. Any ideas? Could it be a fuse? I wouldn't think it would be the SAME fuse for the alarm and the door issues.

TIA
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  #2  
Old 05-21-2010, 12:28 PM
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Bimmer750LI Bimmer750LI is offline
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Same exact here, I assumed it was the battery as these vehicles have a power management control unit that watches over all the electrical consumers and battery condition. It will shut down consumers (control units) that may prevent a start when the battery starts to show signs of age. I'm planning on putting a new battery in but if you find otherwise please share. My battery has never been replaced and it's a 2006 so about time to go...

BTW - reason I feel that it truely is the battery, when I went on vacation for a week I left a solar charger used on the VW/Audi's at port when they are stored for periods. It plugs into the ODBII port and sits on the dash or suction cups to a window so you can aim it towards the sun. When I came back, no issue with entry (diver's door) and all was good with no resetting of the fiber ring (usually hear the CD changer cycling...).

BTW - If it's not the battery the likely culpret would be the power managment computer.

Last edited by Bimmer750LI; 05-21-2010 at 12:45 PM.
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Old 05-21-2010, 01:10 PM
irokdastar383 irokdastar383 is offline
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Mein Auto: 745li
btw if you have comfort acces it uses a watch battery it might be dying and need replacement
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Old 05-21-2010, 02:17 PM
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DLF750 DLF750 is offline
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might try just replacing battery first. it's a new key so would think it's fine. car starts using it no problem. i mean without key in ignition.
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Old 05-21-2010, 10:46 PM
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1bad540 1bad540 is offline
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Hmm Ive had the dealer change a few of my remote batts even though they were not old, not a bad move cause its cheap. did u ever take off that terrible m3 spoiler maybe the car is mad at you....
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Old 05-21-2010, 11:11 PM
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07Seven 07Seven is offline
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Weak battery for sure. I had this problem before, charged the battery and comfort worked again.
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Old 05-22-2010, 06:04 AM
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DLF750 DLF750 is offline
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Will try new remote battery. And no, still have that kool spoiler.
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Old 03-04-2016, 03:15 PM
Maceo-7 Maceo-7 is offline
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I am leaning toward the "battery management" theory as well. I have an '07 750Li. I've never had a problem with these problems for several years then both problems occurred (both Comfort Access door handle lock and alarm not arming). My car sits in the garage for days at a time on a regular bases. Then, I drove it on a long trip (5 hours) recently and when I reached my destination these feature miraculously started working again.
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