As rames14 said, check or replace the battery in the remote and carry an extra in the rig.
I don't think the security light will turn off by itself...I think you would need to turn it off with the remote.
The last time I tried to reset/reprogram, I could not get the red light on the receiver to come either. I physically disconnected the house battery for 30 minutes or so and then tried again and everything worked and is working fine.
One last thing, I did have problems with the remote system when we first got the rig (intermittent operation) and the receiver was replaced under warranty, so that may be an option too.
Here is a link to the instructions for the remote, which it sounds like you may already have, but there are also basic troubleshooting procedures on the last page that might help:
Remote Operation
Jack
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Previous:2004 Mountaineer 325FKBS,2010 Montana 3455SA
Now:2018 Bighorn 3575EL (SOB's
) Res. Fridge,W/D,Disc Brakes,Water Softener,Dish Tailgater PRO,LioN Batts, several mods.
2021 RAM 3500 Laramie....
"LOADED", 4x4, SB H.O. 6.7L, Aisin Trans, PullRite Super Glide Hitch, 52 Gallon Titan Fuel Tank.