I know this is a very common problem. Everything I found on line points to leaking sunroof (which happened and now fixed) which likely corroded some wiring alongside the front passenger floor wiring harness. I tried to fix but no luck. Question:
can you after market install a remote starter that will operate the keyless entry or does that have to tie into the existing system ?? Thanks !

 

When you say "tried to fix but no luck" what do you mean? did you find the green wire connection wrapped in electrical tape and make a proper repair? Did you check all of the fuses in the central junction box behind the glove box to make sure there is not water damage you have not yet seen?

If so, are your keys Land Rover brand or replacements? it could be as simple as a dead battery in the key fob

As for after market products, I never needed or wanted a remote start, so I cannot help you there.

Jeff