Hi I have an 01 Elantra and all the door locks stopped working. The
fuse is good and my next thought would be the driver door switch.
Manually moving the inside lock does not work also. As I said my next
thought would be the door switch but I am confused. Looking at the
Haynes manual it shows the left door actuator as a complete unit
containing switches and a relay as well as some type of circuit. Is
that the case? if so where is it located door, dash etc. The maker of
the keyless entry system I purchased has a list of wire color codes
and it indicates there is some module behind the ash tray that
controls the lock unlock function.

I also figured that since I will be working on it why don't I just
purchase a keyless entry system . Now looking back at the manual I see
what looks like to me is a passive left door actuator only type system
( no actuator motor like the other 3 door ) if that's the case I guess
I  will have to send the unit back. I just wouldn't make sense to open
3 doors (grin)

Any guidance as to where things are located would be great as well as
any ideas as to what might have gone wrong.

Thanks