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  #1  
Old 11-04-2009, 11:29 PM
Jeremy5848's Avatar
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Join Date: Mar 2006
Location: Sonoma Wine Country
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W210 instrument cluster problems

Our 1996 E300D (W210, OM606NA) with 264000 miles has two instrument cluster problems:

1. Even though the float switch in the oil pan has been replaced, the "low oil" warning comes on after the car has been driven a few miles. The warning can be reset with the button. The engine is not low on oil; has never been low on oil.

2. The low fuel warning light illuminates when the tank is full but not as it approaches empty. This one I can understand; in the 210, "low fuel" is sensed electronically rather than by contacts on the float as in older models. It appears that the small surface-mount IC that runs this function has failed.

Has anyone had and fixed either of these problems? Is there a shop that can make a component-level repair or do they just replace the entire PC board? That would be an expensive fix; we can live with both of these irritations rather than spend hundreds of dollars.

Jeremy
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"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #2  
Old 11-05-2009, 12:14 AM
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Location: Walnut Creek, CA & 1,150 miles S of Key West
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Jeremy - I also had the low oil message prior to reaching opterating temp and turning right or left at turn signals. It continued after replacing the sender. Adjusting the electrical connector for a tighter fit resolved that for me.

Can't help with #2.
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Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
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  #3  
Old 11-05-2009, 11:54 AM
Jeremy5848's Avatar
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Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
Quote:
Originally Posted by TMAllison View Post
. . . Adjusting the electrical connector for a tighter fit resolved that for me. . .
The connector at the float switch or at the instrument cluster?
__________________

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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  #4  
Old 11-05-2009, 02:15 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
At the oil sender/pan.
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Terry Allison
N. Calif. & S. of Key West

09' E320 Bluetec 77k
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  #5  
Old 11-05-2009, 08:03 PM
Jeremy5848's Avatar
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Join Date: Mar 2006
Location: Sonoma Wine Country
Posts: 8,394
Connector

IIRC, that was the first thing I did, in June 2008, even before replacing the float switch in November 2008. I also cleaned and tightened the connector when I replaced the switch. I'll check it again but my concern, apart from something in the instrument cluster, is damaged insulation on a wire.

[edit]

Checked the connector, it is clean and tight and making a good connection. The rubber/plastic part of the connector appears to be the original part from the factory and it is somewhat deteriorated. The insulation on the wire is falling apart as the '96 and similar models tend to do, however there is no place for the wire to short-circuit and the stranded wire itself is solidly soldered to the connector.

I left the center section of the belly pan off so I can do some experiments in daylight, see what happens with the connector unplugged or shorted to ground.

Jeremy
__________________

"Buster" in the '95

Our all-biodiesel family
1995 E300D (W124) . .239,000 miles My car
1996 E300D (W210) . .313,000 miles Wife's car
Santa Rosa population 170,685 (2012)
Total. . . . . . . . . . . . 722,685
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Last edited by Jeremy5848; 11-05-2009 at 09:35 PM.
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