Hyundai Repair: Power lock/unlock when using a key, harness connector, door lock actuator

Question
My 2001 Elantra use to unlock all the doors when I used the key to unlock the driver side door (I do not have a remote).  However this is not working anymore.  I have checked all the fuses and none seem to be bad or seem to control this function.  Can you help with this problem??
Thanks!

Answer
It's possible the left door lock actuator is defective.  The door lock actuator has a switch in it that sends a signal to lock or unlock all doors based on what happens in the actuator when you lock/unlock the driver's door.

It's also possible that you have corrosion in the wiring harness connector leading to the driver's door.  Hyundai has a technical service bulletin (TSB) about this issue.  To view, you'll need to register for a free account at www.hmaservice.com.  You'll be interested in TSB 06-90-008.