Have a 2001 hyundai elantra,doors will lock with remote,will not unlock with the remote.have to use key in drivers door to unlock.will not unlock all doors ,only drivers side.Now drivers door with not open from inside ,only the outside lever will open it.

There should be a fuse that runs the power locks. Check and make sure it didn't blow.

This particular vehicle is equipped with two relays. One is the "door lock" and the other is the "door Unlock."

Have a qualified Hyundai Service Technician properly diagnose your vehicle's problem.

Possible issue with the remote controller unit - main board or sub assemblies. The intermittent behavior seems to indicate that the board is erratic to detect at the same time the individual locks work at times.
So make sure all the connectors to the door and to the main board controller are tight. You can remove the main unit and check for any loose connections or clogging, specially water in all the door units or in main unit. If so dry and test.
Otherwise the main unit is a suspect.

door lock actuator might be faulty or bad electrical contact
take off the door panel and diconnect and reconnect the wiring, you might need to change door lock actuator

you have to press it twice to unlock all doors or lock all doors.

I have just purchased a 2001 hyundia elantra, the other day i was filling up with petrol. the doors automatic lock the doors with my keys still inside the car, the doors make a clicking noice all the time

The door LOCK/UNLOCK actuator is siezed. You'll need to replace it.

Apparently the "LOCK" function is working normally because the burglar alarm is being activated when you 'lock' the car. Is this right?
The fact the engine won't start when the burglar alarm is activated is NORMAL If the doors will not UNLOCK front the driver's door manual switch, I believe you have a bad DOOR UNLOCK relay in the control module.

there is a short or a signal from the un-locking switch that is triggering your locks.

you have a switch manually to lock and un-lock your doors, the unlocking circuit is making contact.

you can try playing with your switch to un-short the switch or open it up ang check it.


tnx 4 using fixya,

drcool

There is a "bar" that attaches to the lock like a lever pulling and pushing the door. Over many years and hundreds of unlockings it breaks from the plastic...I am in the same boat. It won't cost that much....take it to the dealer..the part is around $13.00 to replace