All my 05 benz s430 2 remotes buttons won't work

Sounds like the contacts in the buttons are not making contact.. you may want to try taking the remote apart and cleaning the contacts and seeing what happens. If the remote is truely dead you may need a new remote

Duplicate question.

It could be 1 of 2 things.batteries in ur remote are dead or ur key need coding.also check ur fuses

best thing to do would to take it to either the dealer or a car audio place that deals with alarms

hi, point remote at receiver in rear view mirror, press lock or unlock twice, and put in ignition and turn to position II within 30 seconds, then it should work...hope this helps please vote thanks

Synchronization
Turn ignition switch to position II. Turn ignition switch to position 0 and remove key. Within 1 minute: Press and hold key lock button. Press unlock button 5 times. Remote control should now operate system. If not: Repeat procedure.
Programming
When
Key remote control added or replaced. System malfunction.
How
Keys can only be programmed using diagnostic equipment.
NOTE this only works on ml up to 05

Remove emergency key blade from top of remote
Open door manually
It just clips out
It will show you in owners manual,but that is in the car it won,t help
Sound like flat battery, if so key won,t turn untill you charge it

remote controls trasmit frequencies. I believe you hold your home remote control device within 2" to 5" of the car's remote control buttons. You select one button in the car which you wish to use as the garage access remote, and press it simultaniously with the home remote control button long enough for the blinking light to go on and blinks for 5 seconds. Then you are programmed. Test it to make sure it worked. If failed, try again. If it doesn't work, any Mercedes Dealership should do it for you FREE. Some of them now push for some money, but you tell them that you called Mercedes and based on your zip code they said you should go to this dealership and it will be done for FREE! They will take care of it immediately.

YOU MUST fix your REMOTE. REPLACE BATTERY OR BUY A NEW ONE! THE KEY IS A LASER TYPE KEY MADE SOLELY FOR YOUR VEHICLE. SORRY BUT THE KEY IF EXCLUSIVE AND EXPENSIVE!

bulbs burned out or vehicle not recognizing reverse gear engaged at shifter-check wiring before condemning shifter assembly