I had the same thing when I got my LS400 a few weeks ago, even the guy I bought it off didn't know it had remote locking.like the previous guys said the key snaps open and you can get to the battery. The remote will only work up to about 2 metres from the car, this is normal according to the manual.one beep confirms doors locked, two for unlocked.There are no flashing lights or "Get back you ba :tsktsk: :tsktsk: :tsktsk: :tsktsk: d" voices. Also on the left of the steering column the remote switch has to be set to on or it won't work. Hope this helps. There are some good sites on line that sell the batteries for £1 to £2 each.