E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

What's the Little Black Box?

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Old Jun 1, 2007 | 11:25 PM
  #1  
ccozic's Avatar
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From: San Diego, California
1998 E320 Wagon 253K miles
What's the Little Black Box?

On my '92 300TE, on the side of the battery compartment, there's a little plastic black box with a black cover.

Under the cover are some slots numbered 1 thru 16 in white numbers.

Could someone please tell me what this is for? Ignition related?

There's nothing in the owner's manual I can find on it.

Also, a previous post mentions a cheap fuse "behind the battery" that the member said is supposed to improve starting/idling when replaced with a new one. I could not find one anywhere.

Thanks.
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Old Jun 1, 2007 | 11:35 PM
  #2  
Garfunkle_W124's Avatar
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From: Atlanta
1995 S14
If it says Bosch it's the ECU
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Old Jun 2, 2007 | 12:58 AM
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Eliot's Avatar
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From: Virginia
Range Rover Classic
Sounds like the brain box or the fuse box.
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Old Jun 2, 2007 | 05:11 AM
  #4  
Federic0W124's Avatar
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From: Seattle
1992 400E
diagnostic port.
there's a little red light that flashes.
number of flashes=particular fault code.
oh yeah. stop spamming chestnuts.
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Old Jun 2, 2007 | 10:24 AM
  #5  
ccozic's Avatar
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From: San Diego, California
1998 E320 Wagon 253K miles
You're correct, Fed. Thanks a bunch....
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