Hi Jim,
The keyless entry on 2011 models was from Southco, since taken over by Lippert. This is the model that has a rectangular keypad to the left of the entry door.
The control module/receiver is located in the entry door. To access it, you have to remove the window (careful not to drop the glass), and pull the module up - it's located in the core, just below the window frame.
Before taking the door apart, check the transmitter/keypad. When pressing buttons, the keypad should light up. It's not very bright, so you'll need to check it at night. Unless you've replaced the battery recently, I'd start there.
You'll have to pull the keypad off the wall and clean off the adhesive. There are a couple of tiny screws on the back plate that'll let you remove the back to change the battery.
If the battery is OK, you may have to re-enroll it with the receiver.
Here's a link to the manuals that will walk you through the re-enrollment procedure.
If a battery or re-enrollment doesn't fix it, I'd recommend you look at
RVLock.com. Many of us have changed out the entire lock assembly and installed the RVLock V4 product.