I have an 2010 Hyundai i30 that seems to have tempermental central locking. the remote is fully orpperational and doesnt need a new battery as the fault it systematic. it will unlock without hassle, but fails to lock on occasion where multiple tries are needed. has there been any other faults as this?

SOURCE: land rover discovery central locking.

No, likely to be caused by the actuators in the lock mechanism failing usually causing the door to remain locked. The boor door can also fail this way, as do the front side doors. Replacement requires the whole lock unit to be replaced at a cost of roughly £60 a lock, and a hours work. Helps if you have small hands. Requires a full strip down of the door and you will need the lock unit, trim clips (a few quid) and a trim removal tool (tenner). You can bodge with a flat head screwdriver, but the tool does help prevent damage to the clips & trim panel.

SOURCE: mk 4 golf, remote key not locking/unlokcikg doors?

unlock with key and hold key over for 30 secs(windows may go down)then lock with key and hold over for 30 secs(windows may go up)then press remote unlock button and hold for 30 secs,you have just reset system...the closer you have to get to the car for the remote to work the lower the battery power.sensor on top of dash(little black dimple)rarely,if at all, goes wrong.....

SOURCE: changed batteries on my fiat

try this, lock car with key then press and hold lock button (about 15secs)then press unlock button,car should respond....

SOURCE: four new batteries fitted since

Muriel-sounds like you do not drive a lot, so that is probably causing a problem with your batteries-a battery is like a water tank, it starts out full, and it drains when the car is not running due to loads imposed on it by the radio memory, computer memory, and other things. If the drain is long enough (car sits) the batteries' ability to 'recharge' is diminished due to the conventional construction of a standard battery. A normal car battery can only be discharged a few times and come back-if you do a lot of short trips, and it sits long period of times, that is brutal on a CONVENTIONAL lead/acid plate battery. You should seriously consider getting a deep cycle battery-they are usually used in Marine enviornments, but can be used in cars (I have an Optima Yellow top in my Jeep, it is not driven much, and sometimes is only used for short trips). While these batteries are pricy can be found for about $200 or less) they can easily last 8-10 years and they car be fully discharged hundreds of times and they come back fully when recharged-ideal for your circumstances.

this is assuming the dealer knows what they are doing...after the car sits overnight, the battery should read 12.5 volts. when first started. it should read close to 15 volts at the battery AND at the large post on the back of the alternator-it should gradually drop down to around 14+ volts, and should stay close to the even with the lights and heater fan running ar full blast. if it is doing this, your driving circumstances dictate you get a battery more suited to you driving habits.