ladies and gentlemen this is Keith from I repair autos and today I'm going to be
talking about key fobs on your mercedes-benz not functioning you know
you try to unlock the car you try to lock the car you try to open the trunk
none of these things work and I'm assuming that you've changed the battery
already and it's still not working so this video is going to cover all of
the things that you may need to check to ensure that your battery is good that
your fob is working and if it's not why so stay tuned and enjoy this video okay
but before we get started I know you've been meaning to subscribe and by doing
so and sharing and thumbs up the video you push it up in the search engines
results for YouTube which makes it easier to find for other Mercedes users
and they can benefit from it too thanks step 1 check your remote and by
checking the remote I mean press your buttons and every time you
press your buttons you should see a red LED that red LED
means that the button is working and it also means that the batteries inside
your remote is good so that's the first thing that you're gonna do so step two
is to check the infrared signal and you can't see the infrared with your eyes
you have to use your phone's camera so taking your phone and pointing the
remote up at the phone with the camera you would then press the button and
every time you press the button notice that you see the infrared LED coming
through that little red section on the remote so the infrared signal is being
sent from the remote if the infrared was not being sent that would also indicate
that your father is bad but in this case the fob is not bad lighting up your
battery's dead or the fob is not working and all your infrared light was not
lighting up and you're locked out of the vehicle what you would then do you would
remove this key and to remove the key you just slide this little notch leave
back and forth like that and then take the key out you take the key and you use
it in the keyhole of the door to unlock your car the car will start with the fob
as long as the fob is still operational for that section the unlocking locking
mechanism does not affect the starting of the car you're going to check the
fuse for the antenna module the aam antenna module is located in the trunk
number 20 it's all the way down at the bottom it's a 5 amp fuse see check the
fuse on your antenna because the fob transmits and this get picks up by the
antenna so this fuse has to be good with candy admission for a few seconds remove
it you will hold both buttons down for 10 seconds continue holding down the
lock button and at the same time press the unlock unlock button five times to
resynchronize if none of these options are working for you then you're gonna
have to get your aam all Activity module diagnosed and you can use an AI car soft
mb2 scanner to see if there are any errors
unfortunately you would have to take it in to a shop that has the mercedes-benz
star diagnostic scanner or an advanced scanner such as the auto tell or snap-on
to reprogram that module if it needs any kind of reprogramming as always everyone
don't forget to Like share subscribe to my channel if you find these videos
helpful what that does it pushes my videos up in the search results so that
other Mercedes owners drivers do-it-yourselfers can find them easier
thanks and peace out