Only one of my my k-9 mundial keyless work the other seems fine but wont activate.

Try to reprogram the remotes to the alarm. Have your vehicle key and both remotes ready. The way to do this is as follows:

1. Turn ignition key to run position.
2. Within ten seconds push the valet button 5 times.
3. The siren will give a chirp, indicating that you are in programming mode.
4. Press the large button on the first remote. A chirp will be given as confirmation.
5. Press the large button on the second remote. A chirp will be given as confirmation.
6. Turn off ignition and remove key. Alarm will give long chirp indicating exiting program.
7. Try remotes. Both should be working.

For the next 48 hours, every time the vehicle is starting the siren will chirp indicating that remotes have been programmed. After 48 hours this feature will turn itself off. Also keep an eye on the alarm light as it will also blink the number of times as remotes are programmed every time the ignition is turn on.

Hope this information helps. Please rate. Thank you.