V1 Data wires to ECM

[cetuttle]

Donor: 2006 base model
I am trying to follow the video, (Part 4 Organizing main harness) at about 0:18 into the the video, it states there should be a brown/brown bk twisted pair coming out of the ECM. I do not have this wire.

I can trace from ODBC to Power Steering to BCM goes in on 1 & 19 - Out on 2 & 20. This goes to C5 / C6 on the dash to body connector. on the other end of this connector is the brown / Brown BK on C5 and C6 but it is cut.

If my memory is correct It was cut from the Air bag. I have looked at The ECM connector I am not seeing any twisted pair. Any Ideas?

 

[Lonny]

Find the body harness connector that hooks to yours engine harness.
The data wires may be on that connector.
If they are they will need to be extended to the BCM.

 

[Dsteinhorst]

Base models run different. I cut my twisted pair accidentally at the same spot. Solder back when the harness is in the car and you'll be good to go.

 

[Lndshrk Steve]

Ok. Can some one help me make sense of this thread? I think this may be part of my wiring problem.
My "Dash to Body" connector was removed months ago, so I can't see where they may have been accidentally cut.
I have wires at "BCM goes in on 1 & 19 - Out on 2 & 20".
I have TWO sets of twisted "Tan & Tan w/Blk" wires at my wiring harness to my engine harness.
I also have an extended set of "Tan & Tan w/Blk" at my BCM, that is connected to NOTHING? I left it there because I extended it and I figured it was needed SOMEWHERE but I never found out where.
What did I miss.

 

[Ross]

I documented the GM high speed LAN wires for my 2006 LSJ here.
Basically, the twisted "Tan & Tan w/Blk" wires are used to bounce the data from one computer to the next.

On my LSJ, those wires start at the OBDII port, and go to the power steering computer,
then a dark brown twisted pair is used to send the data to BCM computer,
then a second set of twisted tan wires to the PCM computer.

Of course the original Cobalt bounced the LAN data thru more computers, but on the goblin, we removed some of those.

 

[Lndshrk Steve]

Thanks. I followed the link and High Speed LAN up to the point of the PCM. Do the base models HAVE a PCM? That's what makes this so tuff. The different models.

 

[Joebob]

The red traces is how I linked up my twisted pair wires. I have a SS/NA with auto so it goes through the Body to engine harness and goes to the TCM. The body to dash connector gets cut out so you have to patch the wires together.

High speed GMLAn

on my X101 Body Harness to Engine Harness, I cut out the high speed GMLAN serial data wires during the main harness thinning videos. Is this correct or do we need them? It is the purple 14 pin connector.

dfkitcar.com

Joe

 

[Lndshrk Steve]

Thanks. This is so **** hard to do "after the fact". And I don't have a TCM so I can bypass that. I looked at that schematic when I was thinning my harness and I thought I had the wires necessary, but I must be missing SOMETHING. I have wires going from the BCM to the ECM. I guess I have to check those for continuity. And WHY did I extend the other set?

 

[Gtstorey]

Do the base models HAVE a PCM?

PCM=Power Control module=ECM=Engine Control Module

 

[Lndshrk Steve]

Ok, I guess the NA's don't have much "Power" but we do have an "Engine".

 

[Desert Sasqwatch]

Might not have the power of the SC or TC, but you can still spank so many of the posers and fart-can equipped ricers out there. 'Shoulda built a Goblin!'

 

[Ross]

Ok, I guess the NA's don't have much "Power" but we do have an "Engine".

The PCM is a transmission and engine controller, while automatics have a separate ECM for the engine, and a TCM for the transmission.

 

[Lndshrk Steve]

Ok, got it.