I used to have one of these Barbie & Ken machines and the electronics when it comes to the security aspects could have been designed by Norton.
I say this because I have lost count of the number of groups of baffled and frustrated people standing in carparks trying to lock the car but only to have negative positive signals (i.e. the bloody alarm going off) or having the back window mysteriously open.
In the end I simply discovered that the best thing to do was to leave the pile of shit unlocked. No bugger was every going to nick it.