Hi had the same problem with a friends car today, its the battery is low, the memory only lasts 3 mins and then the key needs to be re-synced with the car. Using a small screwdriver on the back of the key insert into the hole and push towards the blade, this will remove the blade part of the key from the control part. pull apart the body to reveal the battery compartment, be carefull when prising the battery as the contacts are very weak and have a tendency to snap, i use a small screwdriver and holding the battery i gently prise the battery out between the 2 lugs, replace the battery and then re-sync to car by inserting into ignition and turning to II press the button on remote, doors will lock and unlock, key done
stu
February 2007