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I did both my keys couple of weeks ago without any problems. Did it quickly (about 1sec old battery out -> new battery in) as I was also concerned about reprogramming.
 

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You can easily find the self programming method by search this forum it take about 10 seconds and is easy to do.

Found it:

1) Get in and close all doors. Turn ignition on and off quickly and remove the key (all within about 5 seconds).

2) Within 30 seconds of turning the ignition off, while holding down the "unlock" button, press the "lock" button three times. Release the "unlock" button. (You may or may not get the confirmation from the door locks.) Holding the key at your head level provides best results as the key sensor is in the side window pillar.

3) Repeat for each key you want to initialize within 30 seconds after the last one you initialized (if you have more).

4) Right after doing the last key, quickly put the key back in the ignition and turn it on/off again to finalize.
 

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Gazellio said:
You can easily find the self programming method by search this forum it take about 10 seconds and is easy to do.

Found it:

1) Get in and close all doors. Turn ignition on and off quickly and remove the key (all within about 5 seconds).

2) Within 30 seconds of turning the ignition off, while holding down the "unlock" button, press the "lock" button three times. Release the "unlock" button. (You may or may not get the confirmation from the door locks.) Holding the key at your head level provides best results as the key sensor is in the side window pillar.

3) Repeat for each key you want to initialize within 30 seconds after the last one you initialized (if you have more).

4) Right after doing the last key, quickly put the key back in the ignition and turn it on/off again to finalize.
The sensor is actually in the rear screen glass....
 

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I'm still getting this msg after switching to a new battery? Is reprogramming necessary? All the functionality is fine, its just the msg on the dash lights up after starting up. This happens on another key we have which is new now as well.

I recently had my BCU replaced. Is that related?
 

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motosport3 said:
I'm still getting this msg after switching to a new battery? Is reprogramming necessary? All the functionality is fine, its just the msg on the dash lights up after starting up. This happens on another key we have which is new now as well.

I recently had my BCU replaced. Is that related?
What message?
 

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motosport3 said:
"Key Battery Low" is the message I'm getting on the key where I replaced the battery and also for a brand new key we got from the dealership.
Have you tried reprogramming the keys together as set out above? If its a new Key it MUST be programmed at the same time as the existing.
 

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I have not. Although all button functions on the key itself work as expected. Rear hatch, lock/unlock. I guess I will try this tonight. There is no caveat to doing the steps above is there (i.e. being unable to start the car)?
 

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Not that I am aware of.

If you do not use the correct sequence nothing will change. If you do then they will re-program correctly.

I re-programmed both my keys to a 2003 I owned and it all went very well. (On second attempt admittedly :D )

Good luck.
 

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I fixed my Key battery low message today. I went by my local British shop and they told me how to do a hard reset. I have never hear of this before.
 

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Thats because you live in a perfect spot on the coast of California. Welcome to the site and was the hard reset a disconnect of the battery cables and then the cables touched together and then the steering wheel turned lock to lock after a reconnect of the battery?
 

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I just disconnected the battery, touch the terminals together and put it back together. I did get the "inactive suspension warning" for a few minutes but it is all fine now. Oh hey, where I live is very nice. You must have been here before.
 
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