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Car Forum / BMW Cars / July 20072002 BMW 3 serires key batteries
So my key's batteries are now dead and the boys at the dealer tell me, with a smirk, that the battery can't be replaced and I have to buy a whole new key for the jaw dropping discount price of $214! Does anyone know if I can actually replace the battery myself? thanks David Newton David: Poppycock! I see you are educated in reading the dealer's smirk. I have a 3 Series and replaced the batteries in the keys. I believe there are two different types of keys. For mine, there is a small indent where a screwdriver can be used to pry the back off key. Then remove two small screws that hold the battery(s) in place. Batteries (nothing special) are available at your local drugstore in the watch battery area. I have a set of small screwdrivers (jeweler's screwdrivers) from Radio Shack cost able $3 bucks. ********************************** Tom Caines "The Answer is Always Yes" ********************************** > So my key's batteries are now dead and the boys at the dealer tell me, > with a smirk, that the battery can't be replaced and I have to buy a whole > new key for the jaw dropping discount price of $214! Does anyone know if I > can actually replace the battery myself? > thanks > David Newton > I have a 3 Series and replaced the batteries in the keys. I believe there > are two different types of keys. Yes, somewhere around 2000 the newer keys were introduced which have a rechargeable battery in them. It gets charged every time you put the key in the ignition. From all I've read, those batteries are not replaceable. Pete >> I have a 3 Series and replaced the batteries in the keys. I believe there >> are two different types of keys. > >Yes, somewhere around 2000 the newer keys were introduced which have a >rechargeable battery in them. It gets charged every time you put the key in >the ignition. From all I've read, those batteries are not replaceable. How do you tell? Take the battery out and read the battery's "code" number? > How do you tell? Take the battery out and read the battery's "code" > number? There is no way to take the new keys apart - so there is no way to replace the battery or take it out and read it's "code" (whatever that is..) > So my key's batteries are now dead How do you know the batteries are dead? Because the remote does not work? Not the best test...from my experience. One of my remotes was not working, due to non use of about one year. I thought the battery was dead too. Then I went through the programming sequence with the dead key ...lo and behold the dead key began to work. My experience has been that these keys go through some self atrophy. Instead of buying a new key, first go through the programming sequence. Make sure you program both keys at the same time. And monthly alternate using keys. Because they are recharged in the ignition. > know if I can actually replace the battery myself? I did not see where the key could be opened. Gamini Weerasekera. >> So my key's batteries are now dead > [quoted text clipped - 11 lines] > monthly alternate using keys. Because they are recharged in the > ignition. I have the same problem with keys for a car I bought - they had not been rotated, so one is fine and the other is flat and whilst it works mechanically did not work after recharge. How do you reprogram it? >> know if I can actually replace the battery myself? > > I did not see where the key could be opened. > > Gamini Weerasekera. > I have the same problem with keys for a car I bought - they had not been > rotated, so one is fine and the other is flat and whilst it works > mechanically did not work after recharge. > > How do you reprogram it? I know this works for E46 models. Note ALL keys must be re-programmed at the same time. To initialize the keys, proceed as follows: Enter the vehicle 1. and close the doors. 2. Briefly (max. 5 seconds) turn the ignition on and off again. 3. Remove key; press and hold "unlock" button. While holding "unlock" 4. button, rapidly press "lock" button 3 times within a period of 10 seconds. 5. Release "unlock" button. The LED flashes slowly for a maximum of 10 seconds. The central locking system activates and releases all locks in rapid succession to indicate that the initialization procedure has been successful. If LED continues to flash or if the locking system fails to respond, the initialization procedure will have to be repeated. 6. To initialize additional remote control keys (make sure that no more then 30 seconds elapse between each initialization procedure) repeat steps 3 and 4. 7. 8. Note: The ignition does not have to be cycled on/off for additional key initialization. Lemuel Johnson >> I have the same problem with keys for a car I bought - they had not been >> rotated, so one is fine and the other is flat and whilst it works [quoted text clipped - 14 lines] > 5. Release "unlock" button. The LED flashes slowly for a maximum of 10 > seconds. No LED on my 735i keys :-( > The central locking system activates and releases all locks in rapid > succession to indicate that the [quoted text clipped - 10 lines] > > Lemuel Johnson >>> I have the same problem with keys for a car I bought - they had not been >>> rotated, so one is fine and the other is flat and whilst it works [quoted text clipped - 16 lines] > > No LED on my 735i keys :-( No LED on my 2005 E46 key either The programming sequence is correct for ones without the LED too. > >> I know this works for E46 models. Note ALL keys must be re-programmed at > >> the same time. [quoted text clipped - 7 lines] > >> seconds. > >> 5. Release "unlock" button. .... 5. Release "unlock" button. The central locking system activates and releases all locks in rapid succession to indicate that the initialization procedure has been successful. Now to initialize additional remote control keys (make sure that no more then 30 seconds elapse between each initialization procedure) repeat steps 3 to 5. 3. press and hold "unlock" button. While holding "unlock" 4. button, rapidly press "lock" button 3 times within a period of 10 seconds. 5. Release "unlock" button. The central locking system activates and releases all locks in rapid succession to indicate that the initialization procedure has been successful. >>> I know this works for E46 models. Note ALL keys must be re-programmed >>> at [quoted text clipped - 13 lines] > > No LED on my 2005 E46 key either Or on my 2003 Z4 (E85) key. But my '99 E46 key has an LED - and a replaceable battery. Tom K. >> No LED on my 735i keys :-( > >No LED on my 2005 E46 key either ...or my wife' '02 E46... -- Larry
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