E-Class (W212) 2010 - 2016: E 350, E 550
Sponsored by:
Sponsored by: CARiD

Locking issue using FOB

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Nov 20, 2020 | 08:38 PM
  #1  
Joe Alonso's Avatar
Thread Starter
Member
 
Joined: Nov 2019
Posts: 82
Likes: 16
From: Miami, FL
2016 E350 Base
Locking issue using FOB

Hey All -
I have a rather peculiar situation that just happened this evening. When I parked my car, turned it off, and stepped outside to lock the car using my FOB, the car would not lock. At first, I thought there might have been another door opened (odd, because I was alone), and then I thought perhaps the trunk was opened... but no - everything checked out, but I could not lock the car. I was able to pop the trunk open with the FOB and then lock the car with the lock button found on the trunk panel. Once locked, I was able to unlock the car using the FOB. So that tells me the FOB's battery is fine. I then tried again to lock the car with the FOB, and no luck. It would not lock.

When I got home, I found my spare key and tried the same procedures, and I got the same results: I can't lock the car using the FOB, but I *can* unlock it and pop the trunk. Trying hard to avoid a dealer visit, so I'm really hoping someone knows of this matter and can help.

Thank you all in advance -
Joe
Reply
Old Nov 20, 2020 | 09:30 PM
  #2  
DFWdude's Avatar
MBWorld Fanatic!
Photogenic
Liked
Loved
Community Favorite
 
Joined: Apr 2006
Posts: 4,695
Likes: 1,830
From: Dallas-Ft.Worth,TX
2016 E350 Sport
Don't laugh at this, but...

Hold the fob against your lower jaw and operate the lock button. Your jawbone amplifies the signal at the same distance you tried before.

If the doors lock with this technique, then your battery is indeed low.
Reply
Old Nov 20, 2020 | 10:04 PM
  #3  
Joe Alonso's Avatar
Thread Starter
Member
 
Joined: Nov 2019
Posts: 82
Likes: 16
From: Miami, FL
2016 E350 Base
Originally Posted by DFWdude
Don't laugh at this, but...

Hold the fob against your lower jaw and operate the lock button. Your jawbone amplifies the signal at the same distance you tried before.

If the doors lock with this technique, then your battery is indeed low.
It's pouring rain now, so I will try that (with no one looking) tomorrow
But... BIG BUT... this happening on BOTH Keys??? what are the odds?

BTW - I put a new battery after my original post and re-tried. Nada....
Reply
Old Nov 21, 2020 | 08:40 AM
  #4  
Joe Alonso's Avatar
Thread Starter
Member
 
Joined: Nov 2019
Posts: 82
Likes: 16
From: Miami, FL
2016 E350 Base
OMG!!!! Seriously – I need a vacation and stiff drinks – and like NOW!!! What a ****ing blonde moment this ever was...

Do you want to know what I’ve been doing over and over again to lock the car? I was pressing the UNLOCK button – yes … over and over and over again thinking I was cycling between locking and unlocking – using the SAME button!!! I only figured out how stupid I was when I tried it this morning, and I pressed the CORRECT lock button, and then it hit me what I was actually doing last night. IDIOT… Over worked here…
Reply
Old Nov 21, 2020 | 08:45 AM
  #5  
pierrejoliat's Avatar
MBWorld Fanatic!
10 Year Member
Photoriffic
Liked
Loved
 
Joined: May 2012
Posts: 2,360
Likes: 1,555
From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
Originally Posted by Joe Alonso
OMG!!!! Seriously – I need a vacation and stiff drinks – and like NOW!!! What a ****ing blonde moment this ever was...

Do you want to know what I’ve been doing over and over again to lock the car? I was pressing the UNLOCK button – yes … over and over and over again thinking I was cycling between locking and unlocking – using the SAME button!!! I only figured out how stupid I was when I tried it this morning, and I pressed the CORRECT lock button, and then it hit me what I was actually doing last night. IDIOT… Over worked here…
Happens to the best of us!
Reply
Old Nov 21, 2020 | 09:44 AM
  #6  
RA72825's Avatar
Banned
 
Joined: Oct 2005
Posts: 4,957
Likes: 1,640
I blame Mercedes for your gaff. I mean how difficult could it be to actually outline each function on the fob in a white stamping like 99.999% of the key fobs out there. Bad Mercedes....
Reply
Old Nov 21, 2020 | 11:47 AM
  #7  
DFWdude's Avatar
MBWorld Fanatic!
Photogenic
Liked
Loved
Community Favorite
 
Joined: Apr 2006
Posts: 4,695
Likes: 1,830
From: Dallas-Ft.Worth,TX
2016 E350 Sport
Originally Posted by Joe Alonso
OMG!!!! Seriously – I need a vacation and stiff drinks – and like NOW!!! What a ****ing blonde moment this ever was...

Do you want to know what I’ve been doing over and over again to lock the car? I was pressing the UNLOCK button – yes … over and over and over again thinking I was cycling between locking and unlocking – using the SAME button!!! I only figured out how stupid I was when I tried it this morning, and I pressed the CORRECT lock button, and then it hit me what I was actually doing last night. IDIOT… Over worked here…
OK, that's funny right there. Here's your sign...



...Plus your bonus Shaved Cat...


Reply
Old Nov 21, 2020 | 11:49 AM
  #8  
kajtek1's Avatar
MBWorld Fanatic!
15 Year Member
Photogenic
Liked
Loved
 
Joined: Jan 2009
Posts: 9,225
Likes: 1,798
From: V E G A S
1922 Ford Model T / no OBD
Originally Posted by pierrejoliat
Happens to the best of us!
NAHH... it never happens to me
Reply
MB World Stories

The Best of Mercedes & AMG

story-0

Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish

 
story-1

7 Craziest Things AMG Gas Ever Built

 Verdad Gallardo
story-2

New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

 Verdad Gallardo
story-3

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

 Verdad Gallardo
story-4

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-5

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-6

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-7

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-8

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-9

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
Old Nov 21, 2020 | 04:56 PM
  #9  
Joe Alonso's Avatar
Thread Starter
Member
 
Joined: Nov 2019
Posts: 82
Likes: 16
From: Miami, FL
2016 E350 Base
Originally Posted by DFWdude
OK, that's funny right there. Here's your sign...



...Plus your bonus Shaved Cat...

hahahaha - no doubt. My hand is raised.
Reply
Old Nov 21, 2020 | 06:06 PM
  #10  
DFWdude's Avatar
MBWorld Fanatic!
Photogenic
Liked
Loved
Community Favorite
 
Joined: Apr 2006
Posts: 4,695
Likes: 1,830
From: Dallas-Ft.Worth,TX
2016 E350 Sport
Just pulling your leg, Joe. Everyone should have a shaved cat.

Next best would be a ditzy blonde with a shaved cat...

Last edited by DFWdude; Nov 21, 2020 at 07:46 PM.
Reply
Old Nov 22, 2020 | 09:13 AM
  #11  
RA72825's Avatar
Banned
 
Joined: Oct 2005
Posts: 4,957
Likes: 1,640
I see what you did there, dude. Ha
Reply
Old Nov 22, 2020 | 08:59 PM
  #12  
pb39374's Avatar
Senior Member
5 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2018
Posts: 285
Likes: 60
From: New York
2010 E350 4Matic sedan
Originally Posted by DFWdude
Don't laugh at this, but...

Hold the fob against your lower jaw and operate the lock button. Your jawbone amplifies the signal at the same distance you tried before.

If the doors lock with this technique, then your battery is indeed low.
YES, I learned this “trick” almost 30 years ago. It has worked with every single car I have ever owned.
Reply
Old Nov 27, 2020 | 10:47 PM
  #13  
Derek Leffert's Avatar
Newbie
 
Joined: Nov 2020
Posts: 6
Likes: 0
E350
Same Issue

I’m having the same issue with locking. And I double checked and I AM using the the lock button. Works to unlock and i can lock from the inside but it won’t lock. I just changed the fob battery so that’s not it. Any ideas?
Reply
Old Nov 30, 2020 | 02:03 PM
  #14  
LILBENZ230's Avatar
MBWorld Fanatic!
 
Joined: Jul 2008
Posts: 8,384
Likes: 800
2019 G70 6MT & 2022 Ford Maverick XL
Originally Posted by pb39374
YES, I learned this “trick” almost 30 years ago. It has worked with every single car I have ever owned.
This has worked for all my cars, too.. except the Benz. It's possible the Mercedes simply has much more range and so I've never even needed to try it. But are you sure it works on Mercedes?
Reply

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 11:27 PM.

story-0
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish

Slideshow: Six gift ideas your AMG loving dad or grad will cherish.

By | 2026-06-03 17:26:18


VIEW MORE
story-1
7 Craziest Things AMG Gas Ever Built

Slideshow: Sometimes AMG builds fast sedans. Other times, it builds twin-turbo V12 land missiles and six-wheeled off-road monsters.

By Verdad Gallardo | 2026-05-26 17:59:58


VIEW MORE
story-2
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know

Slideshow: Mercedes-AMG's new electric GT 4-Door Coupe trades combustion for software, synthetic noise, and more than 1,100 horsepower.

By Verdad Gallardo | 2026-05-20 20:08:15


VIEW MORE
story-3
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-4
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-5
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-6
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-7
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-8
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-9
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE