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Mercedes door lock

The automatic door lock system activated by the key fob has stopped working, all the doors and boot no longer unlock/lock. we have to do each one manually. reluctant to take into Mercedes garage for diagnostic and expensive repair! any tips to fix?

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  • 38 Answers

Have you tried replacing the batteries in the key fobs? They are usually only good for a year or two, depending on usage.

Posted on Feb 13, 2014

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Posted on Jan 02, 2017

SOURCE: key fob wont open doors or boot or lock them

you need to reprogram keys with the module. there could be a problem with the module though , you need to check it out

Posted on Aug 13, 2009

  • 510 Answers

SOURCE: have mercedes E class key fob will not open doors,

If key will not turn
Car battery flat,charge or jump to activate elec ignition

Posted on Feb 06, 2010

  • 1 Answer

SOURCE: c240 mercedes key wont turn seems locked

I have a 2001 C240 with the same issue. I removed the positive battery cable from the battery and kept it off for 30 seconds then replaced it. Everything was reset and the key worked.

Posted on Feb 10, 2010

  • 4793 Answers

SOURCE: my Porsche Cayenne S Key fob no longer unlocks the Door

unlock the door then press the lock button on remote and hold down for 20/30 secs.manual does say hold button.....

Posted on Mar 02, 2010

  • 52 Answers

SOURCE: my Porsche Key fob no longer unlocks the doors

Insert key into door barrel or ignition lock and turn key, whilst doing this press the unlock/lock button, the led on the dash should flash to indicate this has initialised the key to the car, then remove key and test operation of remote. If this fails then a new remote plus coding to the car by your dealership is needed

Posted on Apr 29, 2010

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It's only an educated guess. If all other locks switches are working it' either the switch panel itself or an electrical short. Switches are popular, get it checked first

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My keyless entry for my 2008 Volvo s 40 won't work. I've tried replacing the battery but it still doesn't work. Anything I may can do before spending money on a new key.?


How are you trying to open the door , button on key fob ? With this system you can pull up on the drivers handle an it activates Antennas in the external side door handles (C30/C70 front doors, S40/V50 rear doors)
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    Could be your driver door lock mechanism that is going bad , since the other door are working, it cannot be the fob. I would try to change the driver side door latch mechanism.

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    You possibly need to reprogram the lock system to match your fobs.
    If it unlocks by the interior switches then its the fob programming. This site is one example you can look for. http://www.chadspictures.com/automotive/How-To-Program-Toyota-Key-Fob/ If this is not the issue the computer that does the door locks could have died or you can look for the door lock fuse or a cut or pinched wire (due to other damage in an accident or from prior mods you did). Other possibilities include intermittent door solenoids if you can use the interior switch you can click it open and closed until you find the one that does not work every time. Change it out as it can leave your vehicle unlocked or it might interrupt the system. worst case it could be the chassis computer this site sells some http://www.automotix.net/usedautoparts/2008-toyota-sequoia-chassis_computer-product-i88489256n.html?gclid=CKfowo60gb8CFQQOaQodGqUArQ . If the shift lock system is screwed up it could be casing issues also but that's a long shot.

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    2001 Mercedes 430 Doors won't lock-trunk won't unlock--OBDII reads 888 Sounds like fuse. Can you help?


    Hi, if all of the locks on your Mercedes fail to open (or close) first check your key fob to make certain that its battery is working. Replace the worn out battery, if necessary. If key fob is working, you may have a faulty key fob, which can be repaired or replaced by taking it to your dealer.
    If just one lock won't open on your Mercedes, then the problem may rest with broken wiring, a bad solenoid, or perhaps with a blown fuse. Check your fuse box first to determine if a blown fuse is keeping the lock from working. If so, replace the fuse.
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    Besides there is not OBD II 888 code, i have never heard or seen it before...

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    Programming
    When
    Key added or replaced. System malfunction.
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    Obtain all keys. A maximum of 3 keys can be programmed. Close all doors and boot/tailgate. Switch ignition ON. Repeat procedure below 3 times: Within 4 seconds: Press key lock or unlock button. Within 4 seconds: Switch ignition OFF. Within 4 seconds: Switch ignition ON. Within 4 seconds: Press key lock or unlock button. System should now lock or unlock vehicle. Within 4 seconds: Press key lock or unlock button. Within 10 seconds: Press lock or unlock button of first key. System should now lock or unlock vehicle. Press lock or unlock button of second key. System should now lock or unlock vehicle. Press lock or unlock button of third key. System should now lock or unlock vehicle. Switch ignition OFF. Remove key. Check operation of all programmed keys.
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