Question about 2002 Mercedes-Benz C-Class

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Car won't acknowledge key in ignition

My 2001 C240 doesn't respond to the key. won't lock or unlock, can't turn the key in ignition. key battery is fine. what to do?

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As you know the battery in your key not only operates the courtesy controls, it also sends a signal to a sensor in the vehicle that allows the key to be used. Either the chip in the key is faulty or the onboard system is not recognizing the key. Call the dealer(sorry, hate giving that advice) and tell them the same. Have them start with the key first, so to keep the cost down a little. You could check through the technical book for a relay or fuse associated with the security system of the vehicle. You can get this online as a PDF file.

Posted on Jan 23, 2009

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Vehicle entry problem


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Programming a honda transponder key


did some quick research for you and found this easy and very clear step by step instructions on how to program your transponder car key to your vehicle.. this works for the following models though :

Accord 2003 to 2006

Civic 1999 to 2006

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Odyssey 1999 to 2006

Prelude1999 to 2001

Accord SE 1997

CR-V 1998 to 2006

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now here are the steps:


  1. Turn the ignition on
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Civic 1996-1998

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  4. Within 5 seconds turn ignition OFF and press Lock/unlock on the remote fob to be programmed
  5. Within the next 10 seconds, press Lock or Unlock of any remaining keys, allowing the doors o lock or unlock once.
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Radio remotes 2 and 3 button types

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  2. Press he lock button, switch the ignition off and back on and then press lock button again.
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If you will have any further doubts or question to ask i suggest you to check out the page where i found this which is http://www.carkeyadvice.com/step-by-step-fob-programming-guides/honda :) i hope this was the solution you were looking for mate! happy happy new year!

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I cannot find C240 on your list of models so I have chosen a C230 from that list. It is a 1998 model. One of my 2 keys does not get used very often and for the last 12 months or so the red light on...


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C240 mercedes key wont turn seems locked... I went to my car used fob doors unlocked when I tried starting i inserted the key in the ignition and the fob will not turn seems locked..now all of a sudden the...


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.

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Hi abdumi0f,

Firstly, open your glove box and make sure Valet Mode is not enabled, if it is not, follow these steps.

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).
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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!

Hope this helps,

Lazaruselite

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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.

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Try this, it works on several 2002 models:


Step 1: Open drivers door and leave open.

Step 2: Lock and unlock the drivers 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.

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