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Howie, BMW Mechanic
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Experience:  Currently a lead BMW technician. BMW technician since 2001.
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my key remote suddenly stopped working, it will not open doors

Resolved Question:

my key remote suddenly stopped working, it will not open doors trunk etc. 2003 525i. any help in this matter will be greatly appreciated.
Submitted: 5 years ago.
Category: BMW
Expert:  Howie replied 5 years ago.
Your key may have lost its initialization. To reinitialize a key you new to take all of your remote key and print these instructions out and jump in the car. Make sure all of the doors, hood, windows, trunk and sunroof are closed. Them make sure all of the doors are unlocked. Turn the key to just the radio position (just until the radio turns and as well as the airbag light), if the service engine soon light comes on you have turned the key too far, and you need to start over. Once you turn to the radio position turn the key off and pull the key out. Press and hold the unlock button of the remote, then press the lock button three times. At this point the locks of the car should lock and unlock. If this does not happen you need to start over. If you have another key you should initialize that key by starting at the the point of pressing and holding the unlock button, until the doors lock and unlock. Then the key should work again. The entire process with two key should take no more than 30 seconds. You may have to practice this a few times to get it right. I would suggest bringing the instructions with you in the car while doing them. If you have to start over to try again take the key out of the ignition open and close the drivers door and start from the beginning.

You body style car has the tendency to pop the fuel door lock actuator fuse. To see if the fuse is blown you can simply lock the car and see if the fuel door locks respectively.   Then see if it also unlocks. If it works you should have no problems. If the lock does not work you will not be able to initialize the key/s, because the fuse is also the same fuse for the antenna that gets the signal form the key. Find the fuse that is blown in the right hand side trunk compartment and replace it. You can do one of two things to make sure that it does not pop again. Unplug the fuel door lock actuator, or replace the the actuator. The actuator is located at the end of the little green emergency release cable also in the right side of the trunk compartment. They have change the fuse number through certain model years so I do not remember which fuse it is but i think it is a 7.5 amp fuse. Once the fuse pops the keys will have to be reinitialized once the fuse is replaced.

Another reason why you key does not work is because is just flat out broken, and unfortunately this is the most costliest repair as the dealer is the only one who can get you another one. If you have done all of the above steps and you key still does not work then your key is probably bad, but I would not guarantee it. It may have to be checked out. If you have two keys and one will initialized and the other will not then I am pretty sure you have a bad key. Just remember to try to read, and try the initializing steps a few times as it may not work the 1st time.

If you found my information helpful please click accept! If you have any more questions regarding this issue, do not hesitate to ask. Good feedback also helps me out!

Howie, BMW Mechanic
Category: BMW
Satisfied Customers: 123
Experience: Currently a lead BMW technician. BMW technician since 2001.
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Howie
Howie
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Currently a lead BMW technician. BMW technician since 2001.