I don't know what's wrong with my remote it's not working I locked it and unlock it but it's not working please help me

The fob may need to be reprommed to the car. Do the following:

Grab your working remote. Push the LOCK button five times, allowing exactly two seconds to pass between each press of the LOCK button. Insert the ignition key and turn it to RUN. Push and hold UNLOCK on the working remote for 6 seconds. Push and hold PANIC for one second while continuing to hold UNLOCK. Release both buttons at the same time.
Push any button on the remote to program it. Then push any button on the remote that was already programmed. It has to be reprogrammed. The remote is now programmed to the vehicle. Turn the key to OFF.

Remote may be sending the unlock instead of the lock signal. Do you have another fob to try?

Your keyless remote is equipped with 2 different systems. There is the RF system (long range, lock control only) and the IR system (short range, locks and convenience features such as remote window roll-up and roll-down). It sounds like your RF system isn't working. The only way to test the system, that I know of, is with a Mercedes scanner. It is likely a bad remote.

it is not the actuators, try a different remote, you may have an issue with the car security system/body computer not functioning on the unlock driver door command, one press of remote is unlock driver door and 2 presses is unlock the other doors.

first use your remote, lock-unlock-lock-unlock 5 times. use the key to unlock the door. lock with remote. If this fails, disconnect battery for 5 min. reconnect, should reset control module..

unlock with key and hold key over for 30 secs(windows may go down)then lock with key and hold over for 30 secs(windows may go up)then press remote unlock button and hold for 30 secs,you have just reset system...the closer you have to get to the car for the remote to work the lower the battery power.sensor on top of dash(little black dimple)rarely,if at all, goes wrong.....

Not sure, could be anything from a dead batt. inside the remote. To a bad relay, blown fuse, bad module, or wiring problem. Please give as much specific info as possible. The more you state (what you've tried,done, or changed) can help narrow it down to what wrong. If the remote works on the pass. side door then its not the remote. Let me know, thanks.

does work with your key if so
you remove door panal and lock solniod
see if it has power whan useing remote if so replace solnoid

It took me a few attempts to program a new keyless remote for my 2002 Chevy Blazer.
Insert key into ignition but don' turn it yet. While holding down the UNLOCK switch on the door, the trick is to cycle the ignition ON OFF ON OFF as quickly as possible then release the UNLOCK switch. If done correctly the door locks will cycle 1x to acknowledge. Then hold both the unlock and lock buttons down on the remote for about 15 seconds. The locks should cycle again to confirm...Hope this helps.

I have a 2003 sierra and my remote starter would not work, it would lock and unlock only, checked out this site found the solution, tried it and in two seconds i solved the problem, Just press the lock button and the start button and viola it works again, thanks for all your help , GGGreat site glad i found it John