Could be a bad or worn out remote. You could try synchronizing your remote (from my 98 manual) : stand close to the truck and simultaneously press and hold the lock and unlock buttons for at least 5 seconds. The door locks should cycle to confirm sync. The only other option they off is to see the dealer. Hope this helps.
The batteries may be dead on the remote.
On the inside of the keyless entry remote or sometimes on the back it explains how to do this. I believe you hold the unlock button along with the lock button for 7 seconds near the car. It will explain it on the inside of the keyless entry remote.
On your keyless remote.On your keyless remote.
Check the batteries in the remote with a volt meter.
The positive ( + ) side of the batteries faces down
I have just replaced some batteries in my 2001 ml 320 keyless remote and its not activating my security system. How do I get the remote to work again? Please help!!!
The keypad doesn't take batteries , the remote takes a battery or batteries
find the knotch in the remote and insert a dime and twist
Each remote takes ( 2 ) # 2016 batteries , they are coin style 3 volt lithium batteries
Try SPASTICPUPPY.NET.
Keyless entry is an option and may have not been installed.
Try this: Turn the ignition to RUN (do not start), press the unlock button on the keyless remote, ignition OFF. Repeat 2x. Turn the ignition to RUN, press the unlock button on the keyless remote twice, the power locks should cycle to indicate successful programming. Turn the ignition OFF and test remote.