LT1-LT4 Modifications 1993-97 Gen II Small Block V8

bcm / plug help

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Old 12-21-2008, 12:04 PM
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Default bcm / plug help

first off i dont know what the bcm looks like. I took my harness out of my car and i dont know whats what. I have a wire diagram but its pretty vague. Im converting my harness to a "race car" harness so im ditching pretty much everything. Do i still need to run a bcm? Or can i get away with just my pcm running my engine? All i need to keep is my headlights, tail lights, brake lights and my power windows, everything else is gone. If i do need to keep it, is this what it looks like? And does anyone know what these other plugs are? the blue plug has one wire going to one of the relays, one going to the obd plug under the dash, one goes to the intrument cluster as a tach. signal and one goes to one of my brake switches. But i cant find anything it would have pluged into to.


Its a '94 car...



Old 12-21-2008, 12:39 PM
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I can tell you one thing...you don't even have a BCM, because they only came in 1996 and later f-body cars.
I think the module in the top pic might be the VATS module.
Old 12-21-2008, 01:36 PM
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wow!! That really helps me. Iv been living on your site but everything was for '96 and up and i see why. Thanks a ton!
Old 12-21-2008, 02:05 PM
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i might be misunderstanding what you're asking, but the white, blue and black connectors pictures hook up under the passenger side of the dash to your PCM harness that goes through the firewall. you can see what all this wiring is somewhere on Rob's website.

here's some stuff on those:
http://shbox.com/1/harness6.jpg you can see what the connectors are called here
http://shbox.com/1/harness.htm here's a reference of the whole engine/PCM harness showing those connectors again

http://shbox.com/1/harness_connector_faces.htm on this page there are tabs on the bottom left of the page that shows what each of those connectors has in them for wiring for the various years.

Oh and yeah, that module in the second pic you have is passkey/vats.
Old 12-21-2008, 02:27 PM
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yes that does look like a vats module.....
Old 12-21-2008, 02:52 PM
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ok, can i take the VATS out of the system? Pull all the wires out of the system and will the car still start? If not ill just hard wire my ing. to a push button but figure id ask first.

Thanks for the links, ill look into that!
Old 12-21-2008, 02:55 PM
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http://shbox.com/1/pass_key.html
Old 12-21-2008, 03:00 PM
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Originally Posted by Fbody4Ever
thanks! Iv been living on his site and you guys are still posting links i didnt see
Old 12-21-2008, 04:38 PM
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Originally Posted by Fbody4Ever
i might be misunderstanding what you're asking, but the white, blue and black connectors pictures hook up under the passenger side of the dash to your PCM harness that goes through the firewall. you can see what all this wiring is somewhere on Rob's website.

here's some stuff on those:
http://shbox.com/1/harness6.jpg you can see what the connectors are called here
http://shbox.com/1/harness.htm here's a reference of the whole engine/PCM harness showing those connectors again

http://shbox.com/1/harness_connector_faces.htm on this page there are tabs on the bottom left of the page that shows what each of those connectors has in them for wiring for the various years.

Oh and yeah, that module in the second pic you have is passkey/vats.
that helped out a ton, thanks! 2 more things i need to find out and that harness is done. I have a plug and a relay i dont know what they do. Again the smaller plug is under the pass. side dash and so is the relay. The orange wire is tied into the blue plug thats for "(Automatic) Park/neutral feed from transmission position switch (V8 VIN P only)" other tan wire goes to the main plug that goes under the hood, black wire goes to the little plug pictured and the other blak wire i cut that went to something i took out.

The other little plug, the black wire goes to the relay then the other one goes under the hood.


Old 12-21-2008, 05:08 PM
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I think that is the hatch release relay and the connector to the hatch release button.

pretty sure it is actually



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