2011 C 300, ESL disable + emulator.
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Member
Joined: Aug 2009
Posts: 92
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From: San Francisco Bay Area
2000 E430, 2011 Ford Ranger
2011 C 300, ESL disable + emulator.
I want to disable my daughter's 2011 C 300 ESL. Everything is working fine but I would like to bypass the ESL before it fails with an emulator. My question is can I turn on the key so the ESL goes into the unlocked position then unplug the connector on it so it will not lock when I remove the key so I can remove the EIS for programing without causing other future problems? Thank you everyone.
Senior Member
Joined: Nov 2013
Posts: 428
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From: Auburn, GA
C250 2013
I’m not sure that would work because the system still needs a signal confirming that the ESL has acknowledged the key fob. Without that, the computer won’t allow the vehicle to start.
This was my solution, I had a locksmith disable/bypass the ESL and install an emulator instead. This was done a few years ago, and if I remember correctly, it cost around $450–$50
This was my solution, I had a locksmith disable/bypass the ESL and install an emulator instead. This was done a few years ago, and if I remember correctly, it cost around $450–$50
Super Member
Joined: May 2024
Posts: 505
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From: Northern Indiana
2014 c300 w204.080 3.5 v6
Yes turn on the key and unplug the ESL with the key off. Then pull the ESL out of the column and plug it back in and tie wrap it up out of the way so it dont cause any issues until you can get a emulator programmed.
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Joined: Feb 2025
Posts: 151
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W204 C250 Sport (AMG Package with Pano Roof)
I want to disable my daughter's 2011 C 300 ESL. Everything is working fine but I would like to bypass the ESL before it fails with an emulator. My question is can I turn on the key so the ESL goes into the unlocked position then unplug the connector on it so it will not lock when I remove the key so I can remove the EIS for programing without causing other future problems? Thank you everyone.
Thread Starter
Member
Joined: Aug 2009
Posts: 92
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From: San Francisco Bay Area
2000 E430, 2011 Ford Ranger
OK, just to confirm the procedure. I am going to insert the key and turn on , not start. The ESL should unlock, I will then unplug the ESL, key still in the on position. Once unplugged the ESL should remain unlocked. Then I will turn off and remove the key so I can take out the EIS for programing to the emulator. Should I disconnect the battery after the ESL is unplugged? Thank You. And yes I will leave the ESL in place with the emulator secured somewhere under the dash.
Last edited by gribble; Feb 22, 2026 at 09:34 AM.
Member
Joined: Feb 2025
Posts: 151
Likes: 50
W204 C250 Sport (AMG Package with Pano Roof)
OK, just to confirm the procedure. I am going to insert the key and turn on , not start. The ESL should unlock, I will then unplug the ESL, key still in the on position. Once unplugged the ESL should remain unlocked. Then I will turn off and remove the key so I can take out the EIS for programing to the emulator. Should I disconnect the battery after the ESL is unplugged? Thank You. And yes I will leave the ESL in place with the emulator secured somewhere under the dash.
Scroll to Sept 18 in the link below for instructions with photos on how I did this exact job.
https://mbworld.org/forums/c-class-w...sl-failed.html
Thread Starter
Member
Joined: Aug 2009
Posts: 92
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From: San Francisco Bay Area
2000 E430, 2011 Ford Ranger
Thank You gav24v your write will be so helpful. I think I need to change my sequence of operation a little. When you mentioned the noise the ESL makes I realized that I think I only have to insert the key, not turn it to unlock the ESL , right? Right after that I will disconnect the battery. I think I can remove the key without battery power. I am rapidly approaching 80 so flexibility and eyesight might slow me down a bit . With the information from forum I will get it done. I did order the EIS removal tool. Thank you to all.
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Joined: Feb 2025
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W204 C250 Sport (AMG Package with Pano Roof)
Thank You gav24v your write will be so helpful. I think I need to change my sequence of operation a little. When you mentioned the noise the ESL makes I realized that I think I only have to insert the key, not turn it to unlock the ESL , right? Right after that I will disconnect the battery. I think I can remove the key without battery power. I am rapidly approaching 80 so flexibility and eyesight might slow me down a bit . With the information from forum I will get it done. I did order the EIS removal tool. Thank you to all.
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Thread Starter
Member
Joined: Aug 2009
Posts: 92
Likes: 11
From: San Francisco Bay Area
2000 E430, 2011 Ford Ranger
Great, once I set up a day with my daughter to do it I will get started. Hopefully when I report back it will be with a successful task completion thanks to everyones help.
