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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 04-07-2010, 01:04 PM
2000wagon528i 2000wagon528i is offline
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Location: Carlsbad, CA
 
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Mein Auto: 2000, 528i wagon
Keyless Entry Transponder Replacement

So I accidentally took my E39 Key into the water with me yesterday and now it doesn't work. The key itself works to unlock the doors and to start the car, so the RFID must still be operational. Any ideas on where to purchase a new keyless entry transponder that I can switch out and mate to my car?
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  #2  
Old 04-07-2010, 02:45 PM
edjack edjack is offline
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Yes, the dealer. Only place to get one.

Read my post under "BMW Keys"
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  #3  
Old 04-07-2010, 02:55 PM
cn90 cn90 is offline
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Give this a try first:
1. Open the key cover and use a hair dryer to blow dry the inside.
2. Change the battery (I think it is CR2016 IIRC).

It may or may not work but give it a try.
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  #4  
Old 04-07-2010, 03:59 PM
2000wagon528i 2000wagon528i is offline
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Mein Auto: 2000, 528i wagon
Thanks for your response, I had already read your post, but it really only addressed the RFID and key portion which needs to come from the dealer. The transponder can be mated to any car if my research proves correct. I guess my only options are the dealer or someone on ebay who happens to have one.

I tried drying it out, but as it was in seawater and pretty corroded in there. Thanks for your suggestions!
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  #5  
Old 04-18-2010, 10:37 AM
2000wagon528i 2000wagon528i is offline
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So, I got my key to work. Searched ebay and got a used bmw key for 20 bucks. I took out the transponder and put it into my existing key. Reprogrammed it, and bingo, works like a charm! Just make sure it is the right key with the right FCC code. Also, there are two old style keys, one with a red LED light (has one battery), and one without a red LED light (has two smaller batteries). They do not work with one another. They look exactly the same from the outside, except for the small red LED light on one of them. Saved me $200 bucks.
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  #6  
Old 04-18-2010, 11:01 AM
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QSilver7 QSilver7 is offline
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You're confusing me. What are you referring to as the "transponder"?

When others refer to the transponder...they are talking about the EWS chip (EEPROM) that is assigned your car. It has an ISN (individual serial number) that has the same ISN as all the other EWS components in the car. THIS is what makes your key specific to your car and WILL NOT WORK with other BMWS.

The keyless entry and alarm features of the key (FZV & DWA) are the RF (radio frequency) tranmsission features that are programmable to other BMWs of like build date. If other BMWs (like here in the USA) have the 315 MHz RF receiver installed...your keys can be programmed to lock/unlock & set the alarm in that car...but only the "TRANSPONDER" (chip) with the specifically assigned ISN will start your car. A transponder/chip/EEPROM from another car can't be programmed to start your car (unless you have some type of aftermarket software that can burn/reprogram the chip).


(This is an illustration of the old style keys...you can see the little (shaded) rectangle that represents the location of the key's transponder)


The "transponder/chip/EEPROM" in the old style "rubber head" key can be seen in the image below. It is the small rectangular thingy in the lower left with the white writing on it. It is loose inside the key case and can be lost if not careful once you remove the circuit board:


The "transponder/chip/EEPROM in the new style key (diamond shape)...is soldered to the circuit board and can be seen in the image below...it is the small square "chip" just below the tip of the blade:

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Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg

Last edited by QSilver7; 04-18-2010 at 11:15 AM.
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  #7  
Old 04-19-2010, 08:27 PM
2000wagon528i 2000wagon528i is offline
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I was referring to the keyless entry as a "transponder". I thought I made that clear in the first two posts. If other people refer to the "transponder" as the RFID chip, then sorry if I confused you. My RFID was fine, I was only trying to replace the keyless entry portion of the remote.
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