Question about 2001 Mercedes-Benz C-Class

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Reprogramming key fob after changing the battery

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  • Marvin
    Marvin May 11, 2010

    this is a dealer only job.

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Were talking about the key fob battery.right?? try holding both the lock and unlock buttons at the same time while pointing the key fob at dashboard/drivers side door area.give it at least 10-20 seconds and see if that resets it.

Posted on Sep 14, 2009

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You will have to take it back to a dealer. Next time have the dealership change the battery, They can do it without having to reprogram it. Keys have a lot of stored data and can be corrupted to the point of having to buy a brand new key, which can run a couple hundred buck. Had a BMW and lost the keys, had to wait two weeks for a key. Had to come from Germany....

Posted on Sep 14, 2009

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I have a 1997 s280, and have laods of problems with they key fob, it takes 2 3volt batteries but when replacing them with new ones, the fob didnt work, i discovered that if you jam a piece of paper down the sides of the batteriesthen put the cover on it just makes the fit tighter and works spot on, hope this helps

Posted on Feb 24, 2010

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Posted on Jan 02, 2017

emissionwiz

Marvin

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SOURCE: key fob not working after battery change ford focus 2006

Try reprogramming it.

1. Turn the ignition from OFF to RUN 4 times within 6 seconds.
2. Turn the ignition OFF. The system will chime to confirm programming mode.
3. Within 20 seconds, press any button on first keyless remote.
The system will chime once to confirm programming.

4. Within 20 seconds, press any button on second keyless remote.
System will chime once to confirm programming.

5. Turn ignition to RUN to exit programming mode.

Posted on May 28, 2009

emissionwiz

Marvin

  • 85216 Answers

SOURCE: Code to program my key fob

Here are the program instructions

1. Close the vehicle doors.
2. Turn OFF the ignition.
3. Remove the key from the ignition.
4. Press and hold the driver side door lock switch in the UNLOCK position.
5. Insert the ignition key into the ignition lock cylinder and remove the key. (Do not turn the ignition key in the lock cylinder.)
6. Insert the ignition key into the ignition lock cylinder and remove the key. (Do not turn the ignition key in the lock cylinder.)
7. Insert the ignition key into the ignition lock cylinder. (Do not turn the ignition key in the lock cylinder.) Leave the ignition key in the ignition lock cylinder.
8. Release the door lock switch. The vehicle will sound three beeps in order to verify the Program Mode has been activated.
9. Press the LOCK and UNLOCK buttons together on the keyless entry transmitter and hold until the vehicle beeps twice to verify that the transmitter has been successfully programmed (this take approximately 15 seconds).
10. Perform the previous step to program up to four transmitters (including your old ones).
11. Remove the ignition key in order to exit the Program Mode

Posted on Dec 04, 2008

Anonymous

  • 18 Answers

SOURCE: reprogram key fob

Here is a quick HowTo on programming your own keyless entry:

1) Turn ignition to OFF.
2) Locate the Data Link Connector, its a black 16 pin connecter that is under the driver's side dash, right where your right knee would be. You have to look up into the dash from below to see it.
3) Ground pin 1 of the Data Link Connector by taking a wire or paper clip and running it from pin 1 to pin 4. Pin 4 is ground so you can just short pin 1 to 4 and it will be grounded. Grounding pin 1 tells the system you are ready to reprogram it.
4) Close all of your doors.
5) Turn the key to ACC then back off. The power door locks will lock/unlock. This is the signal that the system is ready for reprogramming.
6) Push a button on your key fob, doesn't matter which button.
7) If you have 2 key fobs, then press a button on the 2nd fob within 1 minute of pressing a button on the 1st fob. Both must be programmed at the same time. If you only have 1 fob then press a button 2 more times to signal that you only have one.
8) The doors will lock/unlock to signal the codes were received.
9) Remove the jumper wire from the data connector.
10) your done

Posted on May 15, 2009

Anonymous

  • 4 Answers

SOURCE: Neither of 2 standard fobs works

try
sit in the car
point remote at the mirror ir sensor (1995)
press remote twice and within 30 second
insert key and turn to drive position
if you don't havemirror mounted ir sensors
point at your sensor location

Posted on Aug 21, 2009

Testimonial: "Unable use either of standard fobs for months. You have solved the problem at a stroke. Many thanks.One works.I must find the other!!"

Toyota Ed

  • 1861 Answers

SOURCE: How do I change the battery in the key fob and do

Hell, and welocme to FixYa!

The remote comes apart, the front half detatchs from the back half, a small screwdriver is all you need.

The battery is easily removed once the case of the fob is open.

There is no need for any reprogramming once the battery is changed; the computer remembers the frequency of the transmitter.

Posted on Mar 04, 2010

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The fob should not need reprogramming. Changing the battery in it will not affect how the fob works. Even changing the vehicle battery won't have any effect on it. Fobs are Not normally reprogrammable, they usually need replacing instead.

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Car electronics can be very tricky sometimes. Changing the battery in your remote should not cause any need to reprogram your key or remote. I have a trick for you to try:

The old car battery reset trick
I know this sounds absurd, but it works sometimes and is worth trying. If you exhausted all of the options above, disconnect bot terminals on your car battery for 10 minutes. Then reconnect them and try your key fob. This has worked for many people and I have no idea why. If you do, please comment below to explain.

Hopefully this helps out, you would be surprised how many electrical issues this little trick will fix on any vehicle.

If it doesn't work I would suggest what others have suggested in this forum, which is reprogram the key and remote. You can find key and remote programming instructions here:
https://www.keylessentryremotefob.com/Key-Fob-Programming-Instructions-s/1856.htm

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Go to the dealer. It is the only way, they have to use a computer. Changing the battery doesn't make it lose it's program though. You most likely broke the battery hold down. This is the most common thing I see at my shop. If the key still starts the vehicle, you now have a bad key fob. If not, you may be able to get it reprogrammed.

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Most likely: You have to now "reprogram"your key fob and car to recognize each other. Look in your User's Manual for the car or, if it's an aftermarket fob/lock system, look in the user's manual for that. If there's nothing about battery replacement/reprogramming procedures, and it's a factory system, head into a dealer to reprogram it. It could run you up to $120, but that's cheaper than buying a new fob or system. If it's and aftermarket system and the manual says nothing, go to the place you had it installed (repair facility, Future Shop, etc) and have them reprogram it. If they installed it, they should know how to reprogram it.

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