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7 Series - F01 / F02 (2009 - current)
The new re-designed 7 series F01 / F02 leads off the BMW Fxx chassis code!

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  #1  
Old 07-19-2012, 10:14 AM
drandcpa drandcpa is offline
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Keyless Entry/Start Question

I have a 2009 750 with keyless entry and start. I also have a separate "emergency" key to allow me access to the car.
The issue, of course, is that while the key will "manually" open the car, you cannot start the car without the key fob.
My concern is what would happen should I lose/break/misplace the key fob (almost dropped it in the water recently)?
While the key would get me into the car there'd be no way to start it.
Hiding a replacement fob in the trunk wouldn't work as the remote feature would allow anyone to open and start the car.
Someone suggested taking the battery out of the fob until you needed to start the car, but if you take the battery out the fob would need to be reprogrammed, thus valueless to use as an emergency start backup.
Might anyone know if a method to have an emergency remote key fob to leave in the car?
Much thanks for the consideration.
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  #2  
Old 07-19-2012, 10:20 AM
chrischeung chrischeung is online now
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Quote:
Originally Posted by drandcpa View Post
but if you take the battery out the fob would need to be reprogrammed, thus valueless to use as an emergency start backup.
This is incorrect. You can start the car without a battery in the key fob. You just need to hold it next to the steering column where indicated. Check your manual. I believe it recognizes the fob in this manner by induction.

The other option is to just have someone bring you the second fob in the unlikely event a fob is lost. Unless you didn't get or have already lost the second fob.
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Last edited by chrischeung; 07-19-2012 at 10:21 AM.
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  #3  
Old 07-19-2012, 10:54 AM
drandcpa drandcpa is offline
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Thanks...

...for your response.
It was the parts dept at my local BMW dealership who told me taking out the battery would prevent its use, but let me look in the manual (always the last place I think of) and see if that will work. Thanks again for the quick, helpful reply.
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  #4  
Old 07-19-2012, 02:12 PM
chrischeung chrischeung is online now
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Actually - let me clarify. They may be correct. I think the manual says that if the battery is dead, you can start the car. I don't think it explicitly says without battery. So you potentially need a battery in there, even perhaps dead, to complete the circuit. This is the exact wording:

"It is possible to switch on the ignition or start the engine in situations such as the following:
Interference of radio transmission to remote control by external sources.
Discharged battery in the remote control."

Easy enough to give it a try I suppose.
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3/12 ED 7 - thread ID 610350
1/11 ED 6 - thread ID 5767556&postcount=175
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Last edited by chrischeung; 07-19-2012 at 02:18 PM.
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  #5  
Old 07-19-2012, 02:37 PM
king0fspades king0fspades is offline
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Quote:
Originally Posted by drandcpa View Post
but if you take the battery out the fob would need to be reprogrammed, .
I don't think so. Then how would you replace the battery?
Everytime you need to replace battery, you need to reprogram? Most dealers are idiots. On my old E65, my dealer told me to put the fob in the car to recharge. He didn't know that ones with comfort access cannot be charged with car. It needs a Walmart battery.
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  #6  
Old 07-19-2012, 03:27 PM
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Individual750LI Individual750LI is offline
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Quote:
Originally Posted by king0fspades View Post
I don't think so. Then how would you replace the battery?
Everytime you need to replace battery, you need to reprogram? Most dealers are idiots. On my old E65, my dealer told me to put the fob in the car to recharge. He didn't know that ones with comfort access cannot be charged with car. It needs a Walmart battery.
Haha, that's funny.
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  #7  
Old 07-19-2012, 04:12 PM
chrischeung chrischeung is online now
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I just tried it. Car starts without the battery in the fob. But it doesn't recognize the user settings.
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  #8  
Old 08-28-2012, 02:22 PM
lesaint0269 lesaint0269 is offline
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Hey guys dont laugh I have a 2008 528 Xi for a year now and realized today that I can keylessly star the engine without putting the remote in the fob of course I have to be inside of the car. It did start after several try but just after I put the remote in the fob took it out then with the remote on hand I press start and voila the engine start. I went back inside after about half an hour came back to the car try to press start with the remote on hand it dindt start not until I put the remote in the key fob can anyone please walk me through the right way to start the car by just pressing START while I have the remote on hand
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  #9  
Old 08-28-2012, 03:33 PM
NickyBlack NickyBlack is offline
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The key is waterproof
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  #10  
Old 08-28-2012, 08:36 PM
chrischeung chrischeung is online now
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Quote:
Originally Posted by NickyBlack View Post
The key is waterproof
I think it is more water resistant. I went swimming inadvertently with my old M3 comfort access key for 1 hour. No issues, leaks, etc.
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1/11 ED 6 - thread ID 5767556&postcount=175
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  #11  
Old 02-17-2014, 06:21 PM
midwestbmwguy midwestbmwguy is offline
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Life of battery keyless remote

Getting a dash message that the battery on the keyless remote needs to be replaced.

What is the life of the battery?

Is this covered by the base warranty?

Should both remotes be done at the same time? Only use one of them. The other sits in a desk drawer.
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  #12  
Old 02-17-2014, 07:07 PM
knipper knipper is offline
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Quote:
Originally Posted by midwestbmwguy View Post
Getting a dash message that the battery on the keyless remote needs to be replaced.

What is the life of the battery?

Is this covered by the base warranty?

Should both remotes be done at the same time? Only use one of them. The other sits in a desk drawer.

Battery life varies a lot depending on brand and use
They cost $2, or under 50 cents in bulk and you can get them practically anywhere (#2450)
Not necessary, my other one sits in a drawer also
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  #13  
Old 02-17-2014, 07:25 PM
midwestbmwguy midwestbmwguy is offline
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Thanks. Very simple solution. Should not effect key programming?
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  #14  
Old 02-17-2014, 07:37 PM
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Popoemt Popoemt is offline
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Quote:
Originally Posted by king0fspades View Post
I don't think so. Then how would you replace the battery?
Everytime you need to replace battery, you need to reprogram? Most dealers are idiots. On my old E65, my dealer told me to put the fob in the car to recharge. He didn't know that ones with comfort access cannot be charged with car. It needs a Walmart battery.
+1, I have changed my batteries on my key fobs and never needed a trip to the dealer for a reprogramming...
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  #15  
Old 02-17-2014, 10:36 PM
JacksonY JacksonY is offline
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As far as I understand, your key fob is an active (onboard battery) RFID tag with memory, with later models user profiles (seats, mirrors, etc) are stored on the car, so your key fob has no real "programming" as such.

All your key fob does is sends its ID and encrypted keys to the car for authentication and stores your fault logs.

Older key fobs (eg the one I had for my E65) charges while in the socket as its not keyless, new keyless fob requires as battery to store and broadcast its contents.
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  #16  
Old 02-20-2014, 08:33 AM
midwestbmwguy midwestbmwguy is offline
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thanks mission accomplished.

Last edited by midwestbmwguy; 02-20-2014 at 08:50 AM.
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  #17  
Old 02-20-2014, 09:22 AM
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MANNY@ActiveAutowerke MANNY@ActiveAutowerke is offline
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Even if you battery is dead, you would be able to start the car. I know because it happened to me recently, My fob had no battery in it so I had to lock/unlock manually, but once I would slide fob in the ignition I was able to start the car. You just wont be able to use the key less features.
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  #18  
Old 02-20-2014, 01:33 PM
listerone listerone is offline
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Quote:
Originally Posted by drandcpa View Post
I have a 2009 750 with keyless entry and start. I also have a separate "emergency" key to allow me access to the car.
The issue, of course, is that while the key will "manually" open the car, you cannot start the car without the key fob.
My concern is what would happen should I lose/break/misplace the key fob (almost dropped it in the water recently)?
While the key would get me into the car there'd be no way to start it.
Hiding a replacement fob in the trunk wouldn't work as the remote feature would allow anyone to open and start the car.
Someone suggested taking the battery out of the fob until you needed to start the car, but if you take the battery out the fob would need to be reprogrammed, thus valueless to use as an emergency start backup.
Might anyone know if a method to have an emergency remote key fob to leave in the car?
Much thanks for the consideration.
If yours is anything like mine there's a spot on the lower left side of the steering column that connects with the keyfob even when its battery's dead,allowing you to start the car.
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