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Discussion Starter #1
After a heavy frost last night remote fob and keys will not open central locking system, because of a flat battery (one year old) I suspect. Is there anyway of opening the taigate manually as there is no visible cylinder lock? Access would allow me to remove the battery for a charge boost. Is there a lock hiding behind the BMW badge? All advice very welcome!
 

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Charge from the jump terminals under the bonnet.
Or connect a jump to them then unlock the car with the fob to get in the back.
 

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Discussion Starter #5
Thank you! Yes but negative. Have tried three keys but all negative. Key lock used very rarely so probaly u/s. No resistance when I turn the key. Surely there must be some way of entering the car either by way of the tailgate or the bonnet without breaking a window?
 

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Discussion Starter #7
Thank you! I've had a couple of young guys applying a few techniques today that have worked on other cars but no luck. I'm thinking now that the key fob batteries may be undercharged as I only do short journeys of two or three miles daily. They may not be picking up what faint residual power that the battery may hold. Also went to local BMW specialist for advice. It confirmed how difficult it is to break into a double locked tourer or indeed any BMW. It's beginning to look like I may have to break a window to gain access.🤔😣
 

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I've seen some youtube posts where people have put the keys on top of inductive electric toothbrush chargers to boost them up. No idea whether that's legit but might be a no regrets move?
 

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If you can try getting a jump cable to the terminal on the back of the starter or any cable that will carry 12v.
That along with an earth cable will give enough power to unlock the car.
 

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Discussion Starter #10
  • Thank you all for your helpful suggestions. Please refer to my original post. To my pleasant surprise, some five days later, the problem resolved itself this morning. A very mild day here! Before calling out some 'break-in' experts' I decided to have one last attempt at opening the doors with the 'remote'. Bingo! Doors opened and car started. Battery OK and key lock also working. I'm guessing that the 'electronic control unit (?) located (hidden) top right hand corner of the tailgate window, froze over during Sunday night. By today it had thawed out and began responding to electronic commands again. Indeed it may have been OK by Wednesday. I gave up trying to open by the 'remote' and key end of Tuesday. I'm a happy man!(y)
 

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The wiring to the diversity antenna in the spoiler above the tailgate window runs through the boot hinges - might be worth checking that there isn't a broken wire that sporadically connecting/disconnecting as the wiring is known to fail causing issues with lights/tailgate locks/key fob reception.

The change in temperature might have moved things about and re-connected it enough to carry charge. Irrespective I'd be a bit wary of assuming it's all golden because if it's a wire on the way out, it could lock you out again whenever it's feeling a bit vindictive. I'm not aware of the control units freezing with temperature particularly - although no doubt theoretically possible if cold were to impact a dry solder joint for example.
 
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