i have a 92 400se ......can iny body tell me what long black box at the very back of the fuse box is.....it has 2 plugs going in to it iand what does it do........thanks guys.

SOMETHING I FORGOT IT HAS THE NUMBERS 140 542 00 19 ON TOP OF IT IN BIG WHITE NUMBERS

W/S wiper relay! The car also has another relay the controls the wipers, combination relay inside of the fuse box under the cover.

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IM STILL TRYING TO FIND THE CONTROL UNIT FOR THE OUTSIDE LIGHTS ....CAN SOMEBODY TELL ME WERE IT IS THANKS

It should be right behind the relay for the wipers, before the rows of small individual relays in the box F1. It should have a number something like 140 542 03 32 or 05 32.

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Steve Brotherton
Continental Imports
Gainesville FL
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Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)

I can't locate the 140 542 03 32 headlamp module on a 92 300sd. The car has no hi beams.
I see the wiper module behind the front fuse panel... nothing else.

I did not realize the four corner screws needed to come out revealing the modules beneath.

The module came out easy enough using the lever but it refuses to go back in.

Still, no high beams. Is there a relay or does the comb sw carry all the headlamp current?

I'm not sure if this diagram applies to the 300SD.

http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1992/300SE/SYSTEM%20WIRING%20DIAGRAMS/4219.pdf

I'm not seeing a relay for the high beam unless it's located in the module. The 140 542 03 32 does not contain a relay. Nothing in that module looks like it would carry headlamp current. Just a couple of ICs and a few caps, diode... no relay.

Lamp failure bulb is lit on the dash at all times with key on and no hi beam headlamps. Bulbs are good.