2001 E39 525i - Key fob battery replacement

Notices
 

Thread: 2001 E39 525i - Key fob battery replacement

Reply to Thread
Results 1 to 5 of 5
  1. 2001 E39 525i - Key fob battery replacement 
    #1
    BMW Fanatic
    Car Details
    Razza525's Car Details
    Model of Car:
    325i SE Auto
    Year of Manufacture:
    2006
    Transmission Type:
    Auto
    Car Body Type:
    Coupe
    Razza525's Avatar
    Join Date
    Jul 2008
    Location
    Aintree
    Posts
    64
    Thanks
    12
    Thanked 12 Times in 9 Posts
    Started having trouble with key fob not operating intermittently so after browsing through the forum I decided it must be a battery problem.
    I followed the procedure in the "How to" section, fitted in new battery, superglued back together and headed out to the car with a working key and reprogramming procedure for the key I had just replaced the battery.

    As I got to the car I just thought I would give the key a try, (not expecting anything to happen as I had just replaced its battery) Lo and behold the car responded and the doors opened

    Ah! I thought the immobiliser probably wont recognise the key if I tried to start the car. Put the key in the ignition and it started

    Checked my other key and that still works ok, so to recap I changed the battery in the dodgy fob and it worked first time without having to reprogramme it

    Anyone ever had this before?
     
     

  2. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  3.  
    #2
    Bimmer Fan
    Join Date
    Jul 2008
    Location
    Middlesex
    Posts
    11
    Thanks
    1,817
    Thanked 7,115 Times in 5,338 Posts
    Checked my other key and that still works ok, so to recap I changed the battery in the dodgy fob and it worked first time without having to reprogramme it
    That's because the transponder in the key is already coded to your car. I would really question that bit about reprogramming. I've changed the battery in my fob on a couple of occasions and never had to re-code.
     
     

  4.  
    #3
    BMW Fanatic
    Car Details
    Razza525's Car Details
    Model of Car:
    325i SE Auto
    Year of Manufacture:
    2006
    Transmission Type:
    Auto
    Car Body Type:
    Coupe
    Razza525's Avatar
    Join Date
    Jul 2008
    Location
    Aintree
    Posts
    64
    Thanks
    12
    Thanked 12 Times in 9 Posts
    Hi Neal
    The impression given in the "how to" section suggests that it is necessary to recode the key after the rechargeable battery is replaced, but you are now just confirming what I found today.

    When I changed the battery in my focus key fob it needed to be reprogrammed to do anything after the battery change, so I assumed from what I had read on the forum that the BMW would be the same.
     
     

  5. Remove Advertisements
    BimmerForums.co.uk
    Advertisements
     

  6.  
    #4
    Bimmer Fan
    Join Date
    Jul 2008
    Location
    Middlesex
    Posts
    11
    Thanks
    1,817
    Thanked 7,115 Times in 5,338 Posts
    The transponder code is fixed once programmed. You only need to re-program with a complete new key.
     
     

  7. The Following User Says Thank You to xXNealXx For This Useful Post:

    Razza525 (22-01-2009)

  8.  
    #5
    BMW Guru
    Car Details
    Ronnie's Car Details
    Model of Car:
    See above
    Year of Manufacture:
    Never too old, never too new
    Transmission Type:
    Always manual
    Car Body Type:
    Usually 5 doors
    Ronnie's Avatar
    Join Date
    Dec 2007
    Location
    Bournemouth, Dorset.
    Posts
    20,394
    Thanks
    6,198
    Thanked 7,051 Times in 5,322 Posts
    IIRC if the battery is changed before a certain amount of time elapses then the key keeps the coding
     
     

Tags for this Thread

View Tag Cloud

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