scaryeyes

Hi
I have come this far, that all wires from pcm that Im gonna use , is marked up.
Its a -99 corvette harness.
(but the harness match up with -04 in schematic diagram)
Im only gonna use the PCM from the corvette. And then I dont naturally get the OBD2 connector. I have a hard time finding info about this. And I cant even find the OBD2 connector in the diagram. What is it called in this electric language?

Can I have some issues about the serial data lines that leave the PCM? Im using as much of the original harness I can, and even build the new stuff from the original diagram. So I hope Im on the right track here.

Yea... C5 engine in a -34 ford. So it connects to a 21 circuit EZ Wiring harness.

ls1nova71

iTrader: (4)

GM calls it an ALDL connector. In the schematic there will be one wire that needa to go to it, not sure about a Vette, but a truck is on C1 58 if I recall correctly. The other wires that are in the connector are two grounds and a constant power.

scaryeyes

Thanks.
Does it usually come from PCM or BCM? The other cables are not a question then.


EDIT!!!
OK! Found it. Thanks!

scaryeyes

This cable to the PCM C1 58, is a serial data cable. And is to the ALDL connector. But what cable comes from the VATS system?
Can it be the same same cable that uses this 5V 50Hz signal? Its the only cable I can find in the anti-theft diagram, that comes to the PCM.

Because, if I buy a Passkey II Bypass Module For LS1,

http://www.ebay.com/itm/GM-VATS-or-PASSkey-II-Bypass-Module-For-LS1-and-LT1/281179660936?_trksid=p2047675.m1850&_trkparms=aid%3D222002%26algo%3DSIC.FIT%26ao%3D1%26asc%3D11%26meid%3D1987851709826652799%26pid%3D100011%26prg%3D1005%26rk%3D1%26rkt%3D5%26sd%3D271223021636%26
Then I need to know how to connect it.
But still dont know if its gonna work. Maybe dont work on Vette PCM...

I dont want to disable it in the computer, as I want to use the anti-theft system.

ls1nova71

iTrader: (4)

Not completely sure about the Corvette, but on a 99-02 F body it's a dark blue wire on C2 pin 30, yours should be similar.

scaryeyes

No, I have to keep searchin. Pin 30 is unused on my diagram. What should it be named in the PCM?

ls1nova71

iTrader: (4)

I just checked the corvette schematic and its different than an F body. The camaro has a wire called 'fuel enable' but the corvette does not. It only has the one serial data wire that goes to the ALDL which splits off and runs to the BCM. Your best bet is probably going to be having it turned off in the tune. If you want another theft deterent, a well placed fuel pump cut off switch should be as effective.

scaryeyes

Thanks. This saves me money and time.... for now.

Yes Im gonna put a fuel cut off anyway.

LS1MCSS

iTrader: (18)

The wire to the ALDL on the 99 corvette harness is C1, pin 58. It's a dark green wire.

scaryeyes

Yes that far we have come. Thats why I was a little confused, this is the only cable that connects the anti-theft system to the PCM.
But it explains why I didnt find the fuel enable wire.