C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

Key Problem

Old Aug 2, 2012 | 01:11 AM
  #1  
Jhartmann3's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2012
Posts: 24
Likes: 0
From: Pensacola,FL
2001 C240, 2011 Honda pilot EX-L RES, 2005 Tundra
Key Problem

Hello everybody.

After spending almost $600 on spark plugs, wires, transmission fluid change, Coolant, etc. basically maintence. I have a new problem

When i try to use the electronic key, it will not unlock or lock the car. even the light on the key wont light up, The wierd thing is the key is making the car alarm go off. Bought new batteries and tried, same thing.

So after letting the alarm turn off after open the door with the mechanical key, i try to start the car but the key wont turn in the ignition. (left me stranded at publix for almost an hour, until it finally turned and started.

What is causing this.

P.S. Only have one key

(i couldnt find another thread, relating to my problem)
Reply
Old Aug 2, 2012 | 02:05 AM
  #2  
Ivanrad's Avatar
Senior Member
 
Joined: Sep 2011
Posts: 305
Likes: 0
2001 C320 Automatic
Have you checked your battery? try resetting your ecu
Reply
Old Aug 2, 2012 | 03:42 AM
  #3  
Jhartmann3's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2012
Posts: 24
Likes: 0
From: Pensacola,FL
2001 C240, 2011 Honda pilot EX-L RES, 2005 Tundra
I had the battery check by advanced auto about a week ago, they said it was still a good battery, and alternator was good,

They were actually surprised considering it is almost at 12 year old battery.

but maybe i should replace it anyways.
Reply
Old Aug 2, 2012 | 11:07 AM
  #4  
tommy's Avatar
Out Of Control!!
 
Joined: Nov 2001
Posts: 10,067
Likes: 11
From: Westwood, NJ
2004 Civic Si. FWD for the Win!
Ooooh, a 2001 C class. You should be glad it hasn't blown up yet.

It sounds like the EIS to me; do a search. Could be pretty big bucks if it needs to be replaced, around $2k at the dealer, and $1200 or so at an indy.
Reply
Old Aug 2, 2012 | 11:50 AM
  #5  
phister's Avatar
MBWorld Fanatic!
 
Joined: Feb 2009
Posts: 5,054
Likes: 11
From: fort worth, tx
06 C230 SS 6spd
start with the battery but as tommy said, it sounds like the EIS might be the issue.
Reply
Old Aug 2, 2012 | 12:22 PM
  #6  
edgarinho10's Avatar
MBWorld Fanatic!
 
Joined: Jul 2008
Posts: 1,005
Likes: 0
2013 UFO
Where are you located?

Does the car not recognize the key? If so try applying a bit of pressure when you insert the key
Reply
Old Aug 2, 2012 | 04:27 PM
  #7  
SunnyRayToronto's Avatar
Super Member
 
Joined: May 2009
Posts: 904
Likes: 22
From: Toronto, Ontario, Canada, eh!
2003 C230 Sports Coupe, Paprika Metallic Red, Auto, Pano, Leather
Change car battery,...get oem Mercedes car battery,...should be changed every 7 years
Upgrade fuse52 to 20A
Check fuse,.... Especially fuse 8
Check alarm,....you might have a short

SEARCH,.... Lots of threads on this and similar issues

Last edited by SunnyRayToronto; Aug 2, 2012 at 04:29 PM.
Reply
Old Aug 2, 2012 | 04:32 PM
  #8  
ALLDATAdiy INFO's Avatar
Former Vendor of MBWorld
 
Joined: Jan 2009
Posts: 253
Likes: 0
From: California
Mercedes
Alldatadiy.com has information on reprogramming of the key as well as various repairs. Good Luck!
Reply
MB World Stories

The Best of Mercedes & AMG

story-0

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

 Verdad Gallardo
story-1

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

 Verdad Gallardo
story-2

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

 Verdad Gallardo
story-3

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-4

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-5

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

 Verdad Gallardo
story-6

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

 Verdad Gallardo
story-7

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-8

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
story-9

10 Most Reliable Mercedes-Benz Models You Can Buy Used

 Verdad Gallardo
Old Aug 7, 2012 | 02:53 AM
  #9  
Jhartmann3's Avatar
Thread Starter
Junior Member
 
Joined: Feb 2012
Posts: 24
Likes: 0
From: Pensacola,FL
2001 C240, 2011 Honda pilot EX-L RES, 2005 Tundra
Thanks guys!
Sorry for taking for so long to reply.

I got the old key to work inter mentally, usually acts up when it is wet outside. Ordered a new from dealership. $242 later.

But new problem.

Poor radio reception
No alarm siren when opening locked door. And no locking or unlocking sound when lock door. I have Netherlands setting engaged
No keyless entry, unless right by drivers door pionting IR sensor.

I've searched other threads, and its looks like these problems piont to fuse number 8

Just thought i'd update everyone.

And again thank you all for your help

Last edited by Jhartmann3; Aug 7, 2012 at 02:57 AM.
Reply
Old Aug 7, 2012 | 02:57 AM
  #10  
KremerOtha's Avatar
Newbie
 
Joined: Aug 2012
Posts: 8
Likes: 0
bmw
They were actually surprised considering it is almost at 12 year old battery.
Reply

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

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 07:15 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE