Home Forums Articles How To's FAQ Register
Go Back   Xoutpost.com > BMW SAV Forums > X5 (E70) Forum
Arnott
User Name
Password
Member List Premier Membership Search Today's Posts Mark Forums Read

Xoutpost server transfer and maintenance is occurring....
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management


Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-11-2019, 06:21 AM
Member
 
Join Date: Apr 2019
Location: California
Posts: 31
Algold415 is on a distinguished road
Key Fob doesnt lock/unlock Doors or Trunk

I recently purchased a 2009 BMW X5 35D. The previous owner only gave me one key fob, which did not lock/unlock the vehicle via the buttons. I researched and watched about 20 links/videos on this issue but still cannot narrow down what's happening with the key fob.

Symptoms:

I have the sealed key fob with a soldered rechargeable battery (not removable). No keyless entry option on the X5. None of the buttons on the remote work (lock/unlock/trunk). Currently I have to take out the metal key from inside the key fob and use that to lock/unlock the central locks by turning the key in the drivers door lock. Alarm arms/disarms as well with the turn of the metal key. Once I get into the car, I push in the key fob into the dash, press the ignition button, and the car starts and drives without any issues.

What I tried so far:

I soldered in a new battery but both old and new were fully charged(tested with voltmeter), so I know for sure the battery is good. I inspected the electronics components(pcb board) when the key fob was opened and all looked fine.

Tried various DIY key fob re-connection sequences to attempt to pair the key fob with the vehicle but nothing worked. I'm dreading going to the dealer and paying $300-$400 for them to order a new key fob and re-program it. Hopefully somebody can shed some light on this issue, as I'm out of ideas.

Thank you!
Attached Images
 
Reply With Quote

Sponsored Links

  #2  
Old 04-11-2019, 04:03 PM
Member
 
Join Date: Mar 2019
Location: NZ
Posts: 10
thib is on a distinguished road
Hi,
Did you try locking/unlocking holding the key against tailgate glass just under the rear spoiler? Sometimes the diversity antenna (located under the upper plastic trim of the tailgate) loose reception range and need replacement. Happened to me few month ago.
Reply With Quote
  #3  
Old 04-11-2019, 07:07 PM
Member
 
Join Date: Apr 2019
Location: California
Posts: 31
Algold415 is on a distinguished road
Hi. Thanks for the idea. I tried to click the key fob above the trunk hatch and nothing happened. In your case, was there still a faint signal that went through the module or if it is completely dead it will render the key fob functionality useless?

Is there a way to test the module if it's faulty or not? What was the process for you to replace the module? Is it a simple plug and play or did you need to program it? Thanks!
Reply With Quote
  #4  
Old 04-11-2019, 07:29 PM
ard ard is offline
Member
 
Join Date: Mar 2006
Location: Sierra Foothills, California
Posts: 5,658
ard is on a distinguished road
Why would you not insist on two working keys before paying one penny? Especially knowing it's a 400-600 dance.

If you have a proper cable and BMW software, you may be able to do some troubleshooting ....
Reply With Quote
  #5  
Old 04-11-2019, 08:10 PM
Member
 
Join Date: Mar 2019
Location: NZ
Posts: 10
thib is on a distinguished road
I was still able to get the car to lock/unlock with the key against the diversity antenna.
I remember a post were the diversity antenna was KO and the key was not working at all.

It is pretty easy to change, you have to open the tailgate and unclip the upper trim of the tailgate. 2x Torx bolt old the module and you just have to unplug it and plug the new one.

I was in the same boat, not sure if it was the key or the module so went to the wrecker and ask him if I could test the module he had on the carpark to be sure it was ok, took me 5min max to swap.

Just make sure the frequency are the same, mine was 315MHZ. The frequency is written on the module.

http://2009.bmwfans.info/parts/catal...nna_diversity/
Reply With Quote
  #6  
Old 04-11-2019, 08:17 PM
Member
 
Join Date: Mar 2019
Location: NZ
Posts: 10
thib is on a distinguished road
Trim to remove is part n1 in the diagram https://www.realoem.com/bmw/enUS/sho...diagId=51_6405
Reply With Quote
  #7  
Old 04-11-2019, 09:27 PM
Member
 
Join Date: Apr 2019
Location: California
Posts: 31
Algold415 is on a distinguished road
Thanks for all the info! I unclipped the plastic trims and located the diversity antenna. Put the key fob right on it, pressed the buttons while moving the fob around, but still nothing. I guess my next step is to locate another antenna module, swap out and see if that fixes the issue.

Interesting thing is that I don't have any other malfunctions related to the diversity antenna, FM, AM radio working just fine. But knowing BMWs it's probably something that is least expected, like a loose contact or water corrosion on the module pcb..

Thanks for the ideas, I will post back once I get a new module installed.
Attached Images
 
Reply With Quote
  #8  
Old 04-12-2019, 01:18 AM
ard ard is offline
Member
 
Join Date: Mar 2006
Location: Sierra Foothills, California
Posts: 5,658
ard is on a distinguished road
Quote:
Originally Posted by Algold415 View Post
I guess my next step is to locate another antenna module, swap out and see if that fixes the issue.

glad you got it figured out. report back.



Any plans for a second key?
Reply With Quote
  #9  
Old 04-12-2019, 07:06 AM
Member
 
Join Date: Mar 2019
Location: NZ
Posts: 10
thib is on a distinguished road
regarding the radio, in my case FM AM were working fine, just the key reception being the issue
Reply With Quote
  #10  
Old 04-12-2019, 02:46 PM
Member
 
Join Date: Aug 2008
Location: EU - NL - Nijmegen
Posts: 35
BMTouring is on a distinguished road
here are the components of the remote:



LINKto newtis
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On





All times are GMT -4. The time now is 12:42 AM.
vBulletin, Copyright 2019, Jelsoft Enterprises Ltd. SEO by vBSEO 3.6.0
2017 Xoutpost.com. All rights reserved. Xoutpost.com is a private enthusiast site not associated with BMW AG.
The BMW name, marks, M stripe logo, and Roundel logo as well as X3, X5 and X6 designations used in the pages of this Web Site are the property of BMW AG.
This web site is not sponsored or affiliated in any way with BMW AG or any of its subsidiaries.