E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

Orphan wire when I'm reinstalling engine

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Old Feb 16, 2012 | 10:29 PM
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E300TD
Orphan wire when I'm reinstalling engine

I've got a '99 E300TD. I had to remove the engine and most of the left front components so some frame work could be done while I was repairing the engine. I'm almost done reinstalling the engine, but I have one 'orphan' connector that I can't find a home for in the left front. I've accounted for the engine harness, the AC, the washer bottle, lights, etc. The connector has two wires - brown/red and brown. The connector is the same size as what goes into the receiver/dryer temperature sensor. The wiring runs as a pair back up over the wheelhouse, and then merges with another cable by the brake cylinder. I can't find any clues on either "alldatadiy" or on "EPC/Startek", and I've looked at all the schematics I can lay hands on. Any clues?
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Old Feb 16, 2012 | 10:47 PM
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GL450
Posting a picture will probably help identify.
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Old Feb 16, 2012 | 11:17 PM
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Got a few pics.

First - the plug itself - two views:




Now, showing the location and length of lead. This is in the front left corner by the oil cooler and A/C receiver/dryer.



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Old Feb 16, 2012 | 11:46 PM
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W221 S600, W220 S55 AMG Kompressor, W124 300E, W140 S320, W210 E3204M W164 ML320 Bluetec
Complete guess - headlamp washer wire but car doesn't have washers? If so, there should be another...
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Old Feb 17, 2012 | 12:23 PM
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I think is the external temp sensor. search in your front bumper driver side grille

Fabio Daniel
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Old Feb 17, 2012 | 03:25 PM
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E300TD
Originally Posted by Fabio D
I think is the external temp sensor. search in your front bumper driver side grille

Fabio Daniel
You mean the broken, scraped, shattered pieces of plastic that used to be a bumper cover? The scrap plastic that got manufactured when my teenage son hydroplaned, spun, and wiped out the front corner, starting me on this adventure?

BTW, the way he's paying this back is physical labor - he's contributing sweat equity to rebuilding the car, and as a side measure, learning about auto mechanics.

I have an outside air temp sensor - looks like a mutant alien **** probe - in my wiring harness waiting for the bumper cover re-install. The only thing I can think is that maybe the previous poster is correct - it's the wiring for the headlight washer, which isn't installed. The problem with that theory is that the wiring diagram calls for different colored wires for the HCS.

I'm at a loss here.
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Old Feb 17, 2012 | 05:23 PM
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W210 E300D
Just a guess, try brake wear indicator(wire would be coming from the left front wheel up the wheel-well) or hood latch switch at the latch, color seems about right for either one.

Last edited by CKonstantin; Feb 17, 2012 at 07:01 PM. Reason: Fabio D
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Old Feb 17, 2012 | 06:51 PM
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Is not the headlight washer mate, i have headlight washers in my car and not have this wire. i only seen this connector style in the external temp sens/presostatic ac valve/ ac compressor clutch/US spec bumper side markers.. no more than this :S

Edit: Oh maybe is the alarm switch under the hood latch (driver side)

Fabio Daniel

Last edited by Fabio D; Feb 17, 2012 at 06:54 PM.
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Old Feb 18, 2012 | 10:17 AM
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E300TD
Originally Posted by Fabio D
Edit: Oh maybe is the alarm switch under the hood latch (driver side)

Fabio Daniel
That was it. Couldn't see the connector from above - and since I'm over 2m tall, I don't bend down to look at the underside of the hood connector often
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Old Feb 18, 2012 | 11:16 AM
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good to know hope all s fine bro

Fabio Daniel
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