E90Post
 


MaxcySpeed & Company
 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > my key FOB is dying...can I revive it?



Reply
 
Thread Tools Search this Thread
      12-21-2013, 01:27 AM   #1
slowbutsure
Private
 
Drives: 07 AW E90 335i
Join Date: Oct 2013
Location: San Jose, Bay Area

Posts: 62
iTrader: (0)

my key FOB is dying...can I revive it?

I have been using this california (non-comfort access) key fob for a while and it has worked well then today it can't start the engine. It seems to turn on the electronics of the car as usual but won't start the engine. It unlocks, locks, opens the trunk ok. I tried my spare and it is able to turn the engine. Should I just change the battery inside? Any recommendations? Thank you in advance!
slowbutsure is offline  
0
Reply With Quote
      12-21-2013, 06:06 AM   #2
CombatNinja
Defender of the Universe
 
CombatNinja's Avatar
 
Drives: e91 328i, e90 328i, e90 335i
Join Date: Feb 2011
Location: United States

Posts: 1,530
iTrader: (0)

The car should tell you when the comfort access key reaches the minimal batter level. Even if you're not getting that indicator it is worth the $5 and a trip to Radio Shack.
CombatNinja is offline  
0
Reply With Quote
      12-21-2013, 08:25 AM   #3
techietaichi
Captain
 
techietaichi's Avatar
 
Drives: 2006 325i Pre-LCI
Join Date: Aug 2012
Location: Massghanistan, USA

Posts: 777
iTrader: (1)

+1 above. Sounds like you've never changed that battery and your car's an '07? 6 years for that button cell's a good run.
__________________
techietaichi is offline   United_States
0
Reply With Quote
      12-21-2013, 08:33 AM   #4
NormE91
Lieutenant
 
Drives: 2007 BMW 328xi Touring
Join Date: Feb 2013
Location: Massachusetts

Posts: 508
iTrader: (0)

OP says its a non ca fob...

If it is a battery problem, are the non ca fob rechargeable batteries replaceable?
NormE91 is offline   United_States
0
Reply With Quote
      12-21-2013, 09:09 AM   #5
Dark_Knight_335
Came to the N55 Darkside
 
Dark_Knight_335's Avatar
 
Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

Posts: 8,561
iTrader: (23)

Non-CA Fobbs to not have batteries- you need to replace it.
Dark_Knight_335 is offline   United_States
0
Reply With Quote
      12-21-2013, 09:20 AM   #6
mashimarho
BMW Genius
 
mashimarho's Avatar
 
Drives: e92 LCI 335i xDrive™
Join Date: Mar 2010
Location: Grand Rapids, michigan

Posts: 7,933
iTrader: (33)

Garage List
^ Yes.
__________________
-Sean.

360 FORGED///DynamikiLLu51ions///ER///BMS///KW///VRSF///ARKYM///DD///CYBA///STOPTECH///BMW Performance ///
My Progress: http://www.e90post.com/forums/showthread.php?t=770326
mashimarho is offline   United_States
0
Reply With Quote
      12-21-2013, 10:13 AM   #7
NormE91
Lieutenant
 
Drives: 2007 BMW 328xi Touring
Join Date: Feb 2013
Location: Massachusetts

Posts: 508
iTrader: (0)

Quote:
Originally Posted by Dark_Knight_335
Non-CA Fobbs to not have batteries- you need to replace it.
Well, they have a battery, but not supposedly user replaceable. I think, however, there's a RFID type of chip in there that authenticates to the car allowing it to start. Those chips are not powered. That's how it worked on my e46 and e38 anyway. The chip looked like a little piece of black plastic, and you could move it to a new key if your old key got damaged.

Basically the remote "lock/unlock" functions and the "start the car" functions are two different systems enclosed in the key casing.
NormE91 is offline   United_States
0
Reply With Quote
      12-21-2013, 10:51 AM   #8
slowbutsure
Private
 
Drives: 07 AW E90 335i
Join Date: Oct 2013
Location: San Jose, Bay Area

Posts: 62
iTrader: (0)

Quote:
Originally Posted by CombatNinja View Post
The car should tell you when the comfort access key reaches the minimal batter level. Even if you're not getting that indicator it is worth the $5 and a trip to Radio Shack.
but it's not comfort access though. I've looked inside and it does have a battery, however, it does open and close the door ok, it just wont start the engine. Something to do with the chip inside the actual key?
slowbutsure is offline  
0
Reply With Quote
      12-21-2013, 10:54 AM   #9
slowbutsure
Private
 
Drives: 07 AW E90 335i
Join Date: Oct 2013
Location: San Jose, Bay Area

Posts: 62
iTrader: (0)

Quote:
Originally Posted by Dark_Knight_335 View Post
Non-CA Fobbs to not have batteries- you need to replace it.
this is a california key fob, non comfort access.
slowbutsure is offline  
0
Reply With Quote
      12-21-2013, 11:09 AM   #10
NormE91
Lieutenant
 
Drives: 2007 BMW 328xi Touring
Join Date: Feb 2013
Location: Massachusetts

Posts: 508
iTrader: (0)

Here's some information I found

http://www.bmwgm5.com/E46_EWS.htm
NormE91 is offline   United_States
0
Reply With Quote
      12-21-2013, 12:06 PM   #11
Dark_Knight_335
Came to the N55 Darkside
 
Dark_Knight_335's Avatar
 
Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

Posts: 8,561
iTrader: (23)

Quote:
Originally Posted by slowbutsure
Quote:
Originally Posted by Dark_Knight_335 View Post
Non-CA Fobbs to not have batteries- you need to replace it.
this is a california key fob, non comfort access.
Haha- had to read through this a few times before I "got it." *Googles "California key fob."
Dark_Knight_335 is offline   United_States
0
Reply With Quote
      12-21-2013, 04:52 PM   #12
CombatNinja
Defender of the Universe
 
CombatNinja's Avatar
 
Drives: e91 328i, e90 328i, e90 335i
Join Date: Feb 2011
Location: United States

Posts: 1,530
iTrader: (0)

WTF is a California key fob?
CombatNinja is offline  
0
Reply With Quote
      12-21-2013, 05:10 PM   #13
slowbutsure
Private
 
Drives: 07 AW E90 335i
Join Date: Oct 2013
Location: San Jose, Bay Area

Posts: 62
iTrader: (0)

Quote:
Originally Posted by CombatNinja View Post
WTF is a California key fob?
good question...It's been mentioned a few times but I don't really know other than I live in california and the key is CA fob. sorry
slowbutsure is offline  
0
Reply With Quote
      12-21-2013, 05:49 PM   #14
NormE91
Lieutenant
 
Drives: 2007 BMW 328xi Touring
Join Date: Feb 2013
Location: Massachusetts

Posts: 508
iTrader: (0)

Silly narcissistic Californians

When people talk about CA key fobs they mean comfort/convenient access, not California.

When you find out how much the dealer will rape you for a new one, you'll wish it was a Kentucky key fob...
NormE91 is offline   United_States
+1
Reply With Quote
      12-21-2013, 06:05 PM   #15
CombatNinja
Defender of the Universe
 
CombatNinja's Avatar
 
Drives: e91 328i, e90 328i, e90 335i
Join Date: Feb 2011
Location: United States

Posts: 1,530
iTrader: (0)

So the OP has a CA key fob but no CA in the car? Is this real life?
CombatNinja is offline  
0
Reply With Quote
      12-21-2013, 06:11 PM   #16
AddictedToBavarian
My other ride is a Bianchi Infinito
 
AddictedToBavarian's Avatar
 
Drives: E92 328xi
Join Date: Apr 2011
Location: North Jersey

Posts: 2,711
iTrader: (0)

Quote:
Originally Posted by CombatNinja View Post
WTF is a California key fob?
Sarcasm?
AddictedToBavarian is offline   Portugal
0
Reply With Quote
      12-21-2013, 07:05 PM   #17
slowbutsure
Private
 
Drives: 07 AW E90 335i
Join Date: Oct 2013
Location: San Jose, Bay Area

Posts: 62
iTrader: (0)

Quote:
Originally Posted by NormE91 View Post
Silly narcissistic Californians

When people talk about CA key fobs they mean comfort/convenient access, not California.

When you find out how much the dealer will rape you for a new one, you'll wish it was a Kentucky key fob...
Thank you for the clarification. It's a Non-CA fob. Yes, it seems I will get raped because I don't know how else to get a spare going.
slowbutsure is offline  
0
Reply With Quote
      12-21-2013, 07:51 PM   #18
slowbutsure
Private
 
Drives: 07 AW E90 335i
Join Date: Oct 2013
Location: San Jose, Bay Area

Posts: 62
iTrader: (0)

Quote:
Originally Posted by NormE91 View Post
Here's some information I found

http://www.bmwgm5.com/E46_EWS.htm
Thank you NormE91! explains things a bit
slowbutsure is offline  
0
Reply With Quote
      12-22-2013, 03:05 AM   #19
sankohuy
Private First Class
 
sankohuy's Avatar
 
Drives: E92 335i
Join Date: Oct 2012
Location: norcal

Posts: 195
iTrader: (0)

I think you really need to order a new key fob if it's non CA.
__________________
sankohuy is offline  
0
Reply With Quote
      12-22-2013, 03:51 AM   #20
ctuna
Brigadier General
 
Drives: 325xi 06 wagon MT
Join Date: Jan 2010
Location: Santa Cruz, Ca

Posts: 3,651
iTrader: (0)

If it has a cover you can open to see the battery .

If it has a cover you can open to see the battery
and the battery is replaceable it has to be a Comfort Access Fob.
And you can get cr2032 batterys for about 3 bucks each at
a drug store or for less than a dollar on Ebay.
There was a procedure somewhere on how to replace the rechargeable battery in the non ca keys . The bmwgm guy was
saying the problem was seldom the battery though and even
if the battery is flat the fob is suppose to start the car, if you put it in the fob slot. (for either a CA or non CA Fob)
Suggest reading the manual doing a vin check for options
at one of the free websites and verifing if you have comfort
access or not.
If you don't have a manual you can download one for free
at bmwusa.com

Also the old style blade that is in the keyfob needs to be in it
for it to work for starting the car I believe.
Very hard to be of any help without a accurate description
that we can all understand in BMW terms.

Last edited by ctuna; 12-22-2013 at 12:54 PM.
ctuna is offline  
0
Reply With Quote
      12-22-2013, 02:28 PM   #21
Biz92
Enlisted Member
 
Drives: 2008 335I Coupe
Join Date: Dec 2013
Location: Simi Valley, CA

Posts: 42
iTrader: (0)

Garage List
2008 BMW 335i  [0.00]
You CAN replace the battery in the non-Comfort Access key fob. You need to be willing to do some surgery though. I'll put up some pics if requested.

You'll need to cut along the seam around the perimeter of the FOB with a razor blade. Take your time. and be very careful not to penetrate too deep, you can easily damage the PCB inside. I actually knocked a capacitor off and scraped a couple of traces, but I was able to replace the cap (and the traces were not badly damaged). The battery is a Panasonic VL2020 with welded tabs which you will have to de-solder from the PCB. I found a similar battery at Digikey.

http://www.digikey.com/product-detai...P081-ND/119936


I was not able to find the exact same pin configuration for the battery (haven't looked very hard yet), but I think that one could be made to work.

So solder in the new battery and glue the housing with some black CA and you'll be good to go.

http://www.amazon.com/IC-2000-Rubber...rubber+ca+glue

I have not received my new battery yet but I did remove and re-install the old one just to be sure that it would still work and all is good

Good luck!

Last edited by Biz92; 12-22-2013 at 02:33 PM.
Biz92 is offline  
0
Reply With Quote
      12-22-2013, 09:13 PM   #22
slowbutsure
Private
 
Drives: 07 AW E90 335i
Join Date: Oct 2013
Location: San Jose, Bay Area

Posts: 62
iTrader: (0)

Quote:
Originally Posted by ctuna View Post
If it has a cover you can open to see the battery
and the battery is replaceable it has to be a Comfort Access Fob.
And you can get cr2032 batterys for about 3 bucks each at
a drug store or for less than a dollar on Ebay.
There was a procedure somewhere on how to replace the rechargeable battery in the non ca keys . The bmwgm guy was
saying the problem was seldom the battery though and even
if the battery is flat the fob is suppose to start the car, if you put it in the fob slot. (for either a CA or non CA Fob)
Suggest reading the manual doing a vin check for options
at one of the free websites and verifing if you have comfort
access or not.
If you don't have a manual you can download one for free
at bmwusa.com

Also the old style blade that is in the keyfob needs to be in it
for it to work for starting the car I believe.
Very hard to be of any help without a accurate description
that we can all understand in BMW terms.
So did some research...seems the transponder chip in the fob is the culprit. At it's current state, it can still lock, unlock doors, trunk so it must have a battery left. I have a feeling I will be raped for this one though. Anybody work at BMW dealer?
slowbutsure is offline  
0
Reply With Quote
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Forum Jump


All times are GMT -5. The time now is 05:05 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
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