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In order to find your codes, you don't need to plug into the obd2 port. On the bottom right side of the diagnostic port, there should be two pins rather close together. My recommendation is to go to Auto Zone. Some of their stores actually have a key for checking GM obd1 systems. It looks like a key, and has two prongs on it that plug right in to where you need to check your codes. If your local store does not have one, then my advice is to look on the port and find the two bottom prongs that are closest together and jump them.
I have the exact same pinout on my 1995 Buick LeSabre. I have been researching this issue for some time now. The VECI label abve the radiator in my car states "OBD 1 Certified." However, I believe this is only stated because the pinouts of the connector are wrong. I have the VIN L engine, and all technical docs for that engine point to it being controlled by a PCM. PCMs do not report codes by flashing the SES light, only GM ECMs do. GM cars with an ECM and a 16-pin J1850 non-OBD-II connector on them, have a pin-out of 4,5,6,9,12,16. You short pins 5 and 6 to receive diagnostic trouble codes via the Service Engine Soon light. As you can see, those pins do not light up with our common connectors. Our connectors use pins 4,5,8,9,14,16. What I can tell you about this connector is as follows: 4=Chassis Ground, 5=Signal Ground, 8=Keyless RF Trigger (short to 5 to enter program mode), 16=Battery+. (Note 4,5=Ground 16=Battery+ are standard pins for the OBD-II standard. Yet another thing that points to an OBD-II serial uplink.) 1995 was a transition year for GM, in many different aspects including OBD-II. I believe what happened, what the pins were installed in one order believing that they conformed to standard, and then the standard changed before finalization. For more information on this, check out my regular posts to Automotive Forums.com in the Buick LeSabre forum. This is my latest: http://www.automotiveforums.com/vbulletin/showthread.php?t=307153
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