I am in the process of integrating the wiring from the e36 to the Vortec Truck harness.
I've got a bunch of spreadsheets that I made up to help with the process so I figured that I would share what I have.
It seems like a VERY straightforward integration, and I have been so far very pleased with how things are going.
I have a question about some of the keyed vs. constant batt voltages. Right now I have the keyed sources tied into the Red/Wihte (BMW) wire which is what BMW I assumed uses as the ignition Voltage. The Solid Red being constant Voltage.
Then there is the question of the other wire that is attached to the starter besides the Black/Yellow (BMW) which I have spliced to the Purple (GM). This wire is the Black/Green (BMW) that says it goes to the OBC and Wiper circuit...? What to do with this wire? This Goes back to pin 15 on the X20 Connector.
The Fuel Pump Relay... BMW uses Ground to switch on relays correct? At least that is what the logic seems to be if Brown (BMW) is ground. This means that I need to swap pins 4 and 6... Correct? Does the same hold true for the DME/PCM Relay?
You can Delete the o2 sensor relay or use it to power your fans - the LSx PCM controls/powers the o2 sensor.
I really just don't want my PCM to let the smoke out...
You can find the sheets posted below as well as here: http://lsxe36m3.com/?page_id=86
1992-1995 E36 OBDI M50 Wiring Spread Sheets
E36*Web
E36 PDF
1999-2002 Silverado 5.3 Vortec Wiring Spread Sheets
Vortec Web
Vortec PDF
Integration of the two harnesses
Integration Web
Integration PDF
Last edited by Pzary3233; 07-21-2010 at 03:47 PM.
Question - The integration PDF shows for A/C High pressure switch pin -> x20 = pin 5 for pressure switch, but low pressure switch shows -> Shows pin 4 for pressure switch as well. ac compressor relay also shows to use pin 4?
[2.25" Magnaflow][3.38 LSD][GC Track/School][3.5" HFM][Cosmos V2 + Tuning][UUC Sway Bars][UUC Subframe Bushings, RTAB, RSM w/ Plates, Trans. Mounts][X-Brace][Brembos]
That is what I got from the info in the ETM... which is what I don't understand... Need you guys to proof it!
Not too sure but from a quick guess would seem like the pressure switch sends a signal to relay as well to set the speed?
[2.25" Magnaflow][3.38 LSD][GC Track/School][3.5" HFM][Cosmos V2 + Tuning][UUC Sway Bars][UUC Subframe Bushings, RTAB, RSM w/ Plates, Trans. Mounts][X-Brace][Brembos]
To quote Rao in this thread:
going to look into it and fix it when I get home.
From above the following connectons need to be made between a Vortec and e36 harness.
#1AC Request wire needs +12 V INTO the PCM - this is the way that the PCM knows that you want AC
GM PCM 17 DK GRN/WHT A/C Request Signal
BMW X20 6 Pink/White Signal to DME to turn on A/C
#2 AC Clutch wire needs to be used to ground the relay that throws power to the AC clutch - this is the way the PCM turns on the compressor, when it wants the compressor ON it allows this wire to go to ground.
GM PCM 43 DK GRN/WHT A/C Clutch Relay Control
BMW X20 4 Black/Lt Blue AC compressor relay +12V IG1 FROM PCM turn on relay
#3 AC Status wire needs to be spliced into the +12v that is going to the AC compressor clutch - this is how the PCM knows that when it is asking for the clutch to be in it actually is turned on.
This is a GM wire that needs to be spliced into the GM wire running to the AC compressor getting 12 volts.
So what is done with the BMW AC compressor wiring? Just tossed? Or do you splice it into the GM wiring so the HVAC knows what's up.
How about these questions...
I have a question about some of the keyed vs. constant batt voltages. Right now I have the keyed sources tied into the Red/Wihte (BMW) wire which is what BMW I assumed uses as the ignition Voltage. The Solid Red being constant Voltage.
Then there is the question of the other wire that is attached to the starter besides the Black/Yellow (BMW) which I have spliced to the Purple (GM). This wire is the Black/Green (BMW) that says it goes to the OBC and Wiper circuit...? What to do with this wire? This Goes back to pin 15 on the X20 Connector.
The Fuel Pump Relay... BMW uses Ground to switch on relays correct? At least that is what the logic seems to be if Brown (BMW) is ground. This means that I need to swap pins 4 and 6... Correct? Does the same hold true for the DME/PCM Relay?
Last edited by Pzary3233; 07-15-2010 at 08:12 AM. Reason: Automerged Doublepost
Great info in those spreadsheets.
I *think* that you're right about the red/white vs red wires.
I have no idea about your second question.
BMW does use Brown for their ground color. As to whether that's what's used to switch on the relays, I have no idea again.
Signed,
First time engine swapper
The Red(BMW) wires are for sure constant voltage, the Red/White(BMW) wires are now for sure Key'ed voltage.
Last edited by Pzary3233; 07-21-2010 at 08:40 AM.
thanks for sharing this
-Andrew Mensah
Anyone have an info to add?
for keyed on power I used a seperate relay to power all of my lsx ECU power that was fed by the large green wire in the BMW harness. I also didnt use the BMW fuel pump relay, it was just as easy to stick another relay in.
Last edited by 357i; 07-19-2010 at 11:27 AM.
I guess my goal is to keep it as factory looking as possible...
The stock FP wiring is all there.... But you're right it is easy to stick another one in there. Maybe I can find a holder that works for the stock location... hum....
I'll have to go back and look at my harness again tonight inlight of what you just posted.
If done right, anything can look factory =)
oh yes :-)
Was thinking about getting the factory style relay holders since I cannot for the life of me figure out how to get the pins out of them. I've tried the little pick tools without any luck.
yea, I was fighting with those too. Never got them apart
yeah... about that... I'm hoping that my plastic welding skills will be good enough to make a stock looking bracket.
Fixed it woops!
Thanks
Some random wiring questions. I posted this in the E36 section, but I'll post it here too since you guys are smarter than 99% of the posters there.
Where are these wires going to out of the back of the fusebox? Obviously the Red and Red/White are constant and switched, respectively, but what about the others?
This all stems from my dumbass being impatient and cutting the M50's harness when I removed it rather than unplugging everything...sigh.
Ok WHERE in the harness is that picture taken?
my first reaction is those are injector and coil power wires. and the associated grounds.
It is a bundle of wires coming from the rear passenger side of the fusebox. These are the only wires in the harness.
Where in this picture of a harness?
It looks like you cut the Relays off....
The three on the top right of this picture:
Last edited by Pzary3233; 07-21-2010 at 01:42 PM.
Red circle.
Yep 100% the relays.
BTW thanks for the smarter then 99% of BF.c comment... We seem to be diving deeper into these cars then others...
Last edited by Pzary3233; 07-21-2010 at 01:49 PM.
Okay. So I need to hook the solid red ones back up to the battery block, and the red/white to the switched ignition wire, right?.
Then there's one Green/Blue, one Green/Purple, two Brown/Green, and one skinny brown ground.
Any idea where these go? I can't seem to find them elsewhere on the harness.
When I get home I can be of more help....
This is part of the question I had...
check the e36 PDF it MIGHT help a bit.
Bookmarks