Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-24-2007, 03:11 AM
Registered User
 
Join Date: Jun 2007
Location: Sunnyvale, CA
Posts: 24
Angry Speedometer stopped working - 1992 400E

I have a 1992 Mercedes 400E and the Speedometer suddenly stopped working last week. I am trying to get some information and tips for diagnosing and repairing the problem. I understand that this model does not have a speedometer cable but rather has a transmitter sender unit? Are there any fuses that need to be checked? Where is the transmitter located? Is there anything to test or repair or do I just need to replace the transmitter? Other suggestions?
Thanks,
Kim

Reply With Quote
  #2  
Old 06-24-2007, 09:23 AM
Registered User
 
Join Date: Dec 2000
Location: AL
Posts: 1,219
The 300E does have a speedometer cable. Perhaps the 400E is different.
__________________
2012 E350
2006 Callaway SC560
Reply With Quote
  #3  
Old 06-24-2007, 12:35 PM
Registered User
 
Join Date: Mar 2005
Location: Washington State / Seattle area
Posts: 54
Speedo

Hello Benz says this is the way to check operation so you dont replace a cluster for no reason on a 124.034 400E without a mechanical cable you should have a signal generator at left rear of trans. Checked all Fuses?
Remove the cluster and do a resistance check at cluster connector #5 multimeter between socket pins 3 (sensor) and socket 4 (grd) checking your harness and input signal -spec is 1.8k -2.2k ohms.
Also you could check ac voltage signal at same terminals should be >0.2v ac at Ten miles per hour.
Voltage at cluster same connector socket pin 2 is circuit 15 supply v and socket pin 4 gnd should have batt voltage key in pos 2
good luck Tim
Reply With Quote
  #4  
Old 06-24-2007, 07:24 PM
Registered User
 
Join Date: Jun 2007
Location: Sunnyvale, CA
Posts: 24
If there is a signal generator on the transmission, is there also a transmitter or receiver on the speedometer?
Reply With Quote
  #5  
Old 06-25-2007, 12:55 AM
Registered User
 
Join Date: Jun 2007
Location: Sunnyvale, CA
Posts: 24
more info on Speedometer and instrument cluster out

Thanks for the reply. I was looking at the problem again and I have some more information. Besides the speedometer and odometer being out, I noticed that all of the other instruments except for the clock are also out (Oil pressure gauge, fuel gauge, temp gauge, and tachometer are out). So I think this means it must be a fuse, right? I have not located it yet.

Two other clues that might be related:
1. the ABS warning light is on now.
2. low level buzzing noise on the left side that quietens when the turn signals are turned on.

Thanks for any other insights.
Kim
Reply With Quote
  #6  
Old 06-25-2007, 11:28 AM
Registered User
 
Join Date: Mar 2005
Location: Washington State / Seattle area
Posts: 54
Speedo

Check fuses 5 & 6 (replace them!)
Reply With Quote
  #7  
Old 06-25-2007, 02:38 PM
Registered User
 
Join Date: Dec 2000
Location: AL
Posts: 1,219
And beware of fuses that look OK but are really not OK. Sometimes they get hairline cracks.
__________________
2012 E350
2006 Callaway SC560
Reply With Quote
  #8  
Old 06-25-2007, 06:43 PM
Registered User
 
Join Date: Jun 2007
Location: Sunnyvale, CA
Posts: 24
Thanks for the help everyone! It was an 8A fuse: the one that is labeled to include the "Tachometer, cluster,...". It had a hairline that I could not see until it was moved. Mercedes fuses seem a little fragile!!
Thanks again,
Kim

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 11:07 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page