Jason Hall

Hi all. I am new at this so bear with me ive got a 2001 ml270 which one day just lost all remote controls. The console locking switch works well. checking the electrical. I have no power at the fuse and all relays for the central locking seem to be missing a nuetral but have power? can anyone help please!

Plutoe

The first thing I would do is make sure that I have new or good key fob batteries----now can you actuate the features----------after that it's find someone with a good tester!!

Maj. Dundee

The fuse (what fuse?) will remain dead until the AAM sends a neg. signal to the relay.

If changing the batteries in the remote does not do the trick, you will need another AAM, after-which it must be coded to operate by a dealer.

Jason Hall

Thanks plutoe. I have had the keys tested and they are both sending a signal.
and thanks dundee. I wwas afraid you would say that the fuse is f42 (central locking) I had a feelong the aam would be switching the nuetrals. ill have a look at it to make sure its powered up. any advice on testing it?
thanks all

Maj. Dundee

Jason, if the Central Locking Sw. works properly, which it does, then all of the relays and fuses are good. Cent. Locking is strictly electrical.

Remote locking is exactly the same except it relies on a radio frequency signal from the key to the AAM. The key/s are sending the proper signal to the AAM but it is not processing that signal inside the AAM to lock or unlock the doors.

Jason Hall

Thanks dundee. I see what you mean. do you know if the aam controls anything else? it seems as thpugh im looking at a defective aam but ill try all other avenues first. I did this with my abs failure. merc wanted $2000.00 for a new abs setup . I pulled it down and fpund it needed only 2 brushes on the small elec motor. cost like $20.00 . looking for a similar fix on this . Thanks for all your help

Maj. Dundee

The AAM controls countless things. Without it the vehicle will not run.

art_arev

Jason, have you tried to sync your remote after changing the batteries?