I have a 2002 Honda Civic LX. The keyless entry worked fine until a month ago. I thought the battery in the key fob could be weak so I replaced it. The little indicate light on the fob comes on when lock/unlock buttons are pressed. I've tried numerous times to reprogram the fob. It will not enter the program mode. I've followed the instructions correctly.
I even went to the local wrecker and got two other Keyless Entry Modules to try. None would enter programming mode.
Any ideas on what could be causing the issue?

 

my 05 lx was behaving similarly. The light on the remote does not necessarily mean a strong 2025 cell. Also I have read that the effective range of the remote decreases over time. These cars are 20+ years old now. I bought another fresh package of cells and when close to the car it worked again. Try holding the remote right near the driver side window, above the metal part of door. I made no attempt to reprogram.

 

I can be inside the car and it will not operate the door locks!

 

Is it the original fob or a replacement? I couldn't get a replacement I'd ordered to work on mine either. Since I bought it on Amazon I returned it and got a refund. I then ordered a Dorman fob which cost about twice as much as the one that didn't work. The Dorman programmed and worked perfectly.

So in my case the solution was to get rid of the cheap remote fob and buy a good quality one. Range is about twenty feet.

 

I am using the same key fob. I also had two other fobs in the house that I tried to program. None of them worked.
When I first tried to re-program the fob that I previously used successfully, the car sounded like it would go into programming mode (door locks would click) after I did the ignition/push button cycle thing TEN times, but yet when I tried to lock the doors, I was unsuccessful. It no longer clicks the door locks after 10 cycles.

 

Check the wiring on the door hinge there may be a broken wire.That was my problem at least....

 

Thanks for the advise. In my situation, a new key fob resolved the issue.