My remote key will not open the doors - 1993 Mercedes-Benz S-Class

Check the door lock fuse in the fuse panel... try the key on another door... may just be that the manual lk is malfunctioning on that door... if the other doors don't respond and the fuse is good then the key probably needs to be reprogrammed by the dealer to the door... happens when your battery dies or is replaced.

To make the rear door open, you have to hold the button for a while. If the battery is weak, that will drain the power and the door will not open. Try the other remote and see if it works. At that point, I would replace the batteries in both remotes anyway.
That would be the fastest and cheapest way to eliminate one possible problem.
If the inside open button works to open the door, I would say the mechanism is working fine and it is the batteries.
I had to replace the batteries in both my remotes at the 3 year mark. That should be about now, the second time, for yours.
Dave

you need to take the door card off from the inside and reattach the latch

Have you tried the door key in BOTH doors?

Here are the instructions from the factory manual. They must be followed exactly.
2004 ES330
1. Driver's door open, all other doors closed, key removed from ignition switch.
Within 5 seconds:
Insert and remove the key from the ignition switch twice.

2. Within 40 seconds:
Close and open driver's door twice.
Insert and remove the key from the ignition switch.

3. Within 40 seconds:
Close and open driver's door twice.
Insert the key into the ignition switch and close the driver's door.

4. Switch ignition ON and OFF:
A. Once to program a key remote transmitter code whilst retaining the original codes.
B. Twice to program a key remote transmitter code whilst erasing the original codes.
C. Three times to check how many key remote transmitters are currently registered.
D. Five times to erase all registered codes.

5. Remove key from ignition switch. System should now lock and unlock vehicle
once, twice or five times depending which mode has been selected. One to four
times, slowly, to indicate number of key remote transmitters registered.

6. Within 40 seconds:
Press and hold LOCK and UNLOCK buttons simultaneously for 1.5 seconds.
Within 3 seconds: Press any key remote transmitter button.

System should now lock and unlock vehicle once to confirm registration or twice
to indicate registration has failed.

7. Within 40 seconds:
To program additional remotes repeat step 60 now on each additional
remote you want programmed.
8. To exit programming mode open driver's door or insert key into ignition.
9. Step out of car with remote(s) in hand and test remote(s).

Open the remotes up...Are the boards the same...?

Try this.

key not in ignition.
driver door open-others closed
driver door unlocked

1-insert and remove key from ignition two times

2-close and open driver door two times

3-insert and remove key once from ign.

4-close and open drvr door twice

5-insert key into ign.,then close driver door

6-turn key to on (not start) then off, twice
this is rewrite mode,have all remotes to reprogram
it will clear any lost remotes.

7-remove key from ignition,the door locks should cycle twice.if not start over.it may take a few tries.

8-press lock/unlock together and hold for a second

9-release,and press lock on remote,the door locks will cycle confirming program.continue to do other remotes you have,steps 8 and 9.if only one in possesion,you are done.

to end mode open door or insert key into ig.you can do up to 4 remotes.read this a couple of times to get the sequence down.there are time restraints,but if you go in order it will work.do not wait more than a second b/t each step and you will be ok.i know from experience that you can do this as fast as you can and it will enter mode.if steps out of order or you wait to long it wont.print this and have in lap,read ahead of what you are doing.good luck.

the door lock actuator is defective, they get really hard to move when they go bad, that is why the difficulty with the key.

2000 Mazda 626
Note: Make SURE the battery is new.
Instructions for programming ONE keyless remote fob.
1. Open the driver’s door & leave open.
2. Insert the key in the ignition.
3. Turn the key to the on and off position 3 times.
4. Remove the key from the ignition.
5. After door open chime stops, press the door open button 3 times.
6. After chime, press any fob key twice.
7. After second chime, press any fob key twice again.
8. After third chime, press any fob key twice again.
9. Press the door open button once.
10. The car should give another acknowledgement chime.
11. Test key fob.
This DOES work. I just programmed mine successfully today, three hours ago.

2003-04 Mazda 6 REMOTE PROGRAMMING


Step 1: Open drivers door and leave open.

Step 2: Lock and unlock the driver’s door using the power door lock switch on the door.

Step 3: Insert key into the ignition.

Step 4: Turn key to on position and return to off position. (IMPORTANT - use ON position NOT ACC position). Do this 3 times within 10 seconds. Leave key in the ignition.

Step 5: Open and close the driver’s door 3 times. (Door should be left open after this step).

Step 6: ECU should respond by locking and unlocking the doors.

Step 7: Press any button on remote #1 twice. ECU responds by locking and unlocking the car doors.

Step 8: Press any button on remote #2 (etc.) twice. Each time the ECU will respond by locking & unlocking the doors.

Step 9: Remove the key from the ignition and the ECU will respond a final time with a series of door locks and unlocks. You're done!

Good Luck.