Do you have wire diagram for the connector? Thanks!

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

I sell many outside temp displays on Ebay and occasionally come across an individual that needs to convert from a 4 pin connector to a 5 pin.
The diagram I found somewhere on this forum indicates as follows:
Wire color position usage
brown 1 ground(and temp sensor ground)
grey/blue 2 circuit 58D from x6/1(illumination)
green 3 temperature sensor(signal)
----- 4 not used
black violet 5 circuit 15 hot(color may vary)

I hope this helps some.
Dan(cdplayer)

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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I measured at the connector:

pin 1: ground, OK
pin 2: nothing when head light is off and instruments backlight is off; 11.98V when turning lights on. OK
pin 3: nothing displayed for sensor signal
pin 4: 12V permanent ??? for what?
pin 5: 12V permanent. OK

The power supply is OK, that means both my display units seem broken, what a bad luck!

__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

Here's a schematic for a late E320.

Attached Thumbnails

 

Thanks, this time I was looking for my W124 300CE. I saved that info for my other ride E320 for later use.

__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

Sorry I wasn't more clear. That schematic is for a '95 W124 E320.

I'm having the same problem. It happened when I replace my alternator and serpentine belt. The backlight is fine. Earlier today the temperature gauge was reading 136+. So how did you fix the problem.

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k

I gave up after changing two display units without success. Situation exactly like lafooy described.

__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011

---------------------------------------------------------
1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

You possibly damaged the wire from the sensor, which is mounted behind the front license plate.

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Gone to the dark side

- Jeff

not sure if what i am about to say is true or not but i'll say it. I am assuming that if the car is running and the outside temp display shows any number clearly, the sensor is the problem. Therefore, if nothing is displaying at all with the car on, the display is the problem.

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1994 E320, 145,000 miles

Back to square one again. Got my 3rd lcd display today and again nothing ... all of this time wasted. going to look into replacing my sensor by the front license plate now. Should have realized it when pin 3 (sensor signal) was not showing any voltage

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1994 E320, 145,000 miles