E90Post
 


Extreme Powerhouse
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Key Fob not working E91 - Diversity module & antenna troubleshooting



Reply
 
Thread Tools Search this Thread
      03-29-2020, 08:01 PM   #1
imoutsourced
New Member
5
Rep
13
Posts

Drives: BMW 325i e91
Join Date: Mar 2020
Location: Wellington, NZ

iTrader: (0)

Lightbulb Key Fob not working E91 - Diversity module & antenna troubleshooting

Hi guys I'm currently trouble shooting why my key fob has stopped unlocking/locking the car. Ive identified two potential causes which I would like clarification. And after which id be happy to write up my process for anyone else having such problem.

Extra notes, radio works however the signal has never been fantastic, this has remained a constant throughout. Diversity module is receiving its power and sending 5v signal to the Car access system, sign of environmental protrusion in diversity module (dust).

clarification On the function of these exact parts would be really helpful if anyone knew what exactly they were for:

Antenna, Part number 65206933325 (Number 3 in photo)
What appear to be grounding taps, located along every hinge, all appear to have zero or poor contact.

Photos attached, note: ribbon cable is part number 65206933325 and is visually damaged.
Thank you
Attached Images
   

Last edited by imoutsourced; 03-29-2020 at 08:08 PM.. Reason: Image Resizing
Appreciate 0
      03-31-2020, 03:59 PM   #2
imoutsourced
New Member
5
Rep
13
Posts

Drives: BMW 325i e91
Join Date: Mar 2020
Location: Wellington, NZ

iTrader: (0)

bump
Appreciate 0
      04-01-2020, 06:58 PM   #3
ctuna
Lieutenant General
1911
Rep
13,103
Posts

Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

iTrader: (0)

You would have better luck searching the general section there
are already several large threads on this there.
Appreciate 0
      04-03-2020, 12:54 AM   #4
btslo
New Member
3
Rep
19
Posts

Drives: E91 320d M47
Join Date: Feb 2020
Location: Slovenia

iTrader: (0)

If the diversity antenna is getting power, the culprit in 99% of cases are the snipped wires in the tailgate loom.



Think that ribbon is for the brake light that's on the spoiler.
Appreciate 0
      04-03-2020, 01:11 AM   #5
imoutsourced
New Member
5
Rep
13
Posts

Drives: BMW 325i e91
Join Date: Mar 2020
Location: Wellington, NZ

iTrader: (0)

yes i get 12v power to diversity module and a 5v signal out of the module and into the car access module, i'm unable to test resistance along that line as the ends are on either end of the car which is something ive been meaning to do however.
Are you sure about the brake light? because when i look up the part number on the cable is comes up as an antenna, but does not specify what for

Last edited by imoutsourced; 04-03-2020 at 01:16 AM.. Reason: clarity
Appreciate 0
Reply

Bookmarks


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



All times are GMT -5. The time now is 10:26 AM.




e90post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST