Does any know, if I disconnect the car battery what functions need to be re-programmed?

Also, do the keyless entry functions need to be reset after replacing the key batteries?

 

can't speak on the main battery as I still have the original,,

I did replace both key fob batteries and did not reset anything and all items worked the same as prior the battery change,,

 

Changed my battery the other day, nothing needs to be reset. Even navigation items stays locked in memory.

 

I think if you have your dealer replace the car battery they will do what is necessary to save all of your setting but if you just disconnect and replace the battery yourself most settings may be lost.

I don't believe replacing the key fob battery would effect anything.

Dave Mac

 

from my experience, if you disconnect, and connect soon enough, nothing will change, even radio presets. However, if you disconnect for days on end, maybe the radio presets might get deleted, thats about IT.

Trip meter wont reset, neither will your keys, or anything else of any significance for that matter.

 

i changed my main battery few months ago,nothing happend or changed,have Nav ect,it was all the same.

 

Changed the main Batt and nothing happened. Even the radio stations stayed the same, I was amazed.

 

Thanks all-I replaced the battery within 20 minutes and didn't loose any presets.

 

Make sure you turn off you radio before you remove the battery. If not the the radio will go in security code mode. All the sytem will work fine if you are just replacing your remote key battery.

 

sorry to bump an old thread but my folks just purchased an ls430 and the key less entry remote doesn't work, we tried replacing the battery and it still doesn't work, my dad tried to disconnect the battery and connected it again and for some reasons all the windows dropped ( rolled down ) and now everything including the car itself won't wart, dash says check says s/t lock setting, would appreciate some help to resolve this problem, thanks