My remote has been becoming decreasingly reliable, and so I figured it was dying. I had to press the button several times before it worked.

I bought a brand new one, and I programed it, and its now doing the same thing. I figured its probably the sensor in the car. Does anyone know where the unit actually is, so I can take a look at it?

 

do you mean the control unit? if so under fuse box in boot "trunk" behind battery have had same problem i just lock and unlock useing key now

 

Can we assume the batteries have been replaced? If you moved the battery from the bad remote to the new one, that may be an issue.

Have you ever cleaned the contacts inside the remote? Use Rubbing Alcohol on a Q-Tip and get the Gold Contacts and the Rubber Contacts clean and try again. Where you've replaced the Remote, it's not as likely, but maybe they were both exposed to the same source of dirt/liquid?

 

the aerial for the remote is built into the rear screen. if you look above the top most element of the rear defrost there should be 2 short lines that say HIGH SECURITY ANTENNA.
the control box is under fusebox as x300man said.
my remote is the older type apparently, where the rubber buttons have some sort of conductive coating on them that wears away, I used contact adhesive and kitchen foil cut into small squares to revive mine.

 

Like SuperSport said try cleaning the contacts on the remote. I have to clean my remote about every 6 months to keep it functioning properly.

 

The remote I have is literally brand new, with brand new contacts, and brand new battery. Definitely not the fob itself, but rather the electronics.

Next time I get a few minutes Im gonna try opening it up.

 

Also make sure the antenna connection to the module is clean and tight, and the antenna cable has continuity.