Central Locking

[Traveling Man]

When i press the lock button on my key to  lock the van it keeps locking then instantly pops back up open again .any ideas

[jj9]

That happens if all of the doors aren't shut properly but I guess you've made sure they are closed.

I have had the same happen on a Xsara and it turned out to be a broken wire where the wiring comes in at the hinge area of the door, the break was at the back of the multi plug.

[polar]

It could also be a sticking locking unit (the power lock) in one of the doors, even a sticking linkage.

As you tell it to lock the locking unit senses resistance and pops back open.

Try removing the door cards and lubing the linkage and the lock barrels.