Smart Key Problems - Mercedes-Benz Forum
 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 12-13-2011, 03:35 PM
BenzWorld Junior Member
 
Date registered: Nov 2008
Vehicle: 1999 mercedes m320 , Vin 4JGAB54EXXA141286 , 80,000 miles
Location: Kentucky
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Smart Key Problems

2003 C320 4 Door Sedan

The smart key wouldn't open the doors last week, opened the door with the metal key, the Smart Key started the car OK.

I put new batteries in the Smart Key and it didn't work until I put it in the ignition and started the car. I opened and closed the doors about 7 or 8 times and thought I had it fixed. I tried to open the doors in about three hours and it wouldn't work. I used the metal key again to get in and after starting the car the key worked fine, I was able to open and lock doors without any problem.

But, after the car sits around three hours the key will not open the doors. Once I put the key in the ignition it works until it sits several hours.

I took the car to the dealer , they cleared some codes and said they had it fixed. I took it home and of course its not fixed.
I even bought new batteries at the dealer and same problem. I don't think the Dealer know whats wrong and said buy a new Smart Key for $240.00.

Has anyone had this problem ? TIA for your help
erunner2k is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 12-13-2011, 05:48 PM
BenzWorld Elite
 
rudeney's Avatar
 
Date registered: Dec 2004
Vehicle: CURRENT: 2007 CLK550 Cabriolet, 2002 C240 FORMER: 2001 ML320
Location: Birmingham, AL
Posts: 9,517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 50 Post(s)
First of all, do you have more than one key, and if so, do both have the same problem? If you don't have but one key, the first thing I'd do is invest in a 2nd key. If the 2nd key also has the same problem, then it could be the antenna amplifier. They are a common failure. It's mounted to the rear glass, under the stubby antenna. Sometimes the contacts to the in-glass antenna get weak, other times, the entire amp fails from heat. Either way, if that's it, the best repair is to replace the entire rear glass with OEM so that you get the amp pre-installed.

--

- RODNEY
rudeney is offline  
#3 (permalink) Old 12-15-2011, 05:17 AM
BenzWorld Senior Member
 
Andrzejek's Avatar
 
Date registered: Jul 2004
Vehicle: 00 C-230, 04 C-240
Location: Lancaster, CA
Posts: 468
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The smart key for my W202 will not unlock the car on some occasions, especially when its cold outside (go figure). These keys work on both, RF and IR. When the RF (radio frequency) does not work, I point the key at the IR (infrared) receiver window, located on the front door handle, from a short distance to unlock the car. Sometimes I have to use the IR receiver on the passenger side door. My second key stopped working a few months ago, so I'm due for a replacement. I just hope it's the key, and not the ignition circuitry, as the ignition electronics are quite expensive.
Andrzejek is offline  
#4 (permalink) Old 12-15-2011, 07:08 PM
BenzWorld Elite
 
rudeney's Avatar
 
Date registered: Dec 2004
Vehicle: CURRENT: 2007 CLK550 Cabriolet, 2002 C240 FORMER: 2001 ML320
Location: Birmingham, AL
Posts: 9,517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 50 Post(s)
If IR still works when RF doesn't then that's probably the antenna amp that has failed.

--

- RODNEY
rudeney is offline  
#5 (permalink) Old 12-19-2011, 12:45 PM
BenzWorld Junior Member
 
Date registered: Dec 2011
Vehicle: 2000 W208 55AMG
Location: LONDON, UK
Posts: 24
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i got the problem with my c class 2003 coupe the key locks and unlocks the car fine no problem but tot start the engine you need to play up with the ignition it seems like the ignition for sometime doesnt accept the key i put the key in the ignition and nothing starting puting it in and out about 10-15 times and only then it takes the key and starts the engine. does anyone knows what it can be? please help? thanks
astamir is offline  
#6 (permalink) Old 12-20-2011, 04:53 PM
BenzWorld Junior Member
 
Date registered: Nov 2008
Vehicle: 1999 mercedes m320 , Vin 4JGAB54EXXA141286 , 80,000 miles
Location: Kentucky
Posts: 49
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Here's an update on my smart key problem.

I was able to find the other good smart key and changed the two batteries. I tested both of the keys when the car was in the working mode and they worked correctly. I went out in about three hours and the car was unlocked and neither key could lock the doors. I aimed at the sensor on both doors and rear window and nothing worked.

I put a key in the ignition, turned to #2 position and back, then removed the key. After this both keys worked. I'm convinced the keys are good.
It's something else, any ideals ?
erunner2k is offline  
#7 (permalink) Old 12-20-2011, 05:33 PM
BenzWorld Elite
 
rudeney's Avatar
 
Date registered: Dec 2004
Vehicle: CURRENT: 2007 CLK550 Cabriolet, 2002 C240 FORMER: 2001 ML320
Location: Birmingham, AL
Posts: 9,517
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 50 Post(s)
Do any of the RCL functions (panic, lock, unlock, trunk) work from the key? If not, then I suspect it's a problem with EIS communicating with the RF and IR receivers. I'd check wiring harnesses, starting at the EIS, to see if anything looks loose or suspect. Also check the wiring connectors going up the C-pillars that connect the the antenna amp module and trace back from there.

--

- RODNEY
rudeney is offline  
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W203 C-Class


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

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Topic Author Forum Replies Last Post
2000 E320 smart key problems......help tap2169 General Mercedes-Benz 6 01-28-2010 08:37 PM
smart roadshow successfully supported by smart mover motion simulators smart-mover smart 5 04-06-2006 04:32 PM
smart key problems rajinder W210 E-Class 2 05-18-2004 08:55 PM
Smart Key problems??? Darkmann W210 E-Class 4 12-12-2002 09:09 AM
smart key problems Kent W208 CLK Class 5 10-04-2001 09:15 AM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome