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Old 02-13-2001, 11:13 AM   #1
the spacecowboy
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Member#: 765
Join Date: Jan 2000
Location: westernport,md,usa
Post two plugs under dash Q

i was under my dash looking and there two green plugs that go together but they are unhooked....
3 prong plug
what is this for...

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Old 02-13-2001, 11:28 AM   #2
Scooby Specialist
Member#: 80
Join Date: Jul 1999

don't hook them up. it makes your car act wierd and you'll be running around for days wondering what the heck happened to your car. trust me, i know.

some have speculated that they are connected to force the ECU into running in some special mode while the cars are being transported off the ships and onto trucks and stuff, but no one knows for sure.

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Old 02-13-2001, 11:34 AM   #3
Scooby Specialist
Member#: 2248
Join Date: Aug 2000
Chapter/Region: MWSOC
2012 C63
2012 Silverado HD


A stereo shop plugged them together on a friend's RS when they installed his alarm. He got a CE light and his car wouldn't go above 3K rpm until he did an ECU reset.
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Old 02-13-2001, 11:59 AM   #4
Scooby Newbie
Member#: 2167
Join Date: Aug 2000
Location: Daytona Beach, FL USA

A sneeky hunch tells me to ask a mechanic, he probably knows.
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Old 02-13-2001, 02:59 PM   #5
Ian Cook
Scooby Newbie
Member#: 1228
Join Date: Apr 2000
Location: UK
1993 Group N Impreza
White (Mostly) ;)



On the UK cars, there are 2 black plugs and 2 green plugs under the steering column/dashboard, i suspect from reading some of the posts that you have the same on the later cars !

They are used for diagnostics, if you get a check engine light come on, you can plug them together, swithc the ignition on, and count the flashes on the immobiliser light and this gives you the error code, of course if you have a subaru select monitor this is pointless as they plug in and tell you all this plainly

Another usefull little use for these is you can reset the ECU's error codes by pluggin both sets together, cant remember the exact procedure for this, its been a while !

As someone else mentioned, do NOT leave them plugged together as it puts the ECU into get you home/to the dealer mode cos it thinks theres a serious problem somewhere

Hope this helps, oh and BTW this method means you dont have to reset any codes in your car stereo, and the best method to reset the error codes, is to use the Subaru Select monitor to do it, cos you plug it in and say reset, and its done LOL
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Old 02-13-2001, 03:06 PM   #6
Scooby Newbie
Member#: 2920
Join Date: Nov 2000
Location: Burlington, MA, USA

When I plugged them together my check engine light came on and flashed repeatedly. It seemed to be a pattern. Does it dump fault codes from the ECU (like an audi)? I unplugged them and the car ran fine without any reset.
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Old 02-13-2001, 03:17 PM   #7
Ian Cook
Scooby Newbie
Member#: 1228
Join Date: Apr 2000
Location: UK
1993 Group N Impreza
White (Mostly) ;)


CE light flashing repeatedly is normal when the connectors are plugged together !

Our cars use the immobiliser light to flash the error codes, i dont even know if you have the immobiliser light in yours, i never looked while i was over D'OH!!!!
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Old 02-14-2001, 01:49 AM   #8
Fred Fredburger
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Member#: 2539
Join Date: Oct 2000
Location: Snohomish, WA, USA

Cowboy> check out these two posts...

Which ECU reset is better?
Can't find one ECU Check Connector...

If anyone can help me find the last ECU Check connector I would be terribly grateful.


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