OH and while many of the new lower priced OBD II units claim to work with OBD I and have the adapters, very few actually work with the system you have. I would call around or if you wish to DIY look online for the above scan tools, the bricks and older Genisys units are all over the place, just be sure they have the software or the cartridge for your year. It depends on when they became GM dealerships and if the tool still works. Some dealers will have them setting on the shelf under 2 inches of dust while others will just wave you away. The Snap-On MT2500 (Brick) with the correct cartridge will read them, as will the Tech II and the Tech 2000. Auto diagnostic tools from Grainger include a wide range of products you can use to diagnose automotive engine, electrical and. The common OBD II units won't read the data because it's in the wrong place and the wrong type and there is no jumper method to read the codes like the OBD I systems. They also used the OBD II connector the same way on a couple models. The first time a new scan tool is powered ON, you’re prompted to read and agree to an End User License Agreement (EULA) and register your tool. The connector looks like an OBDI part but the system actually uses a hybrid of OBD I and II parts and protocols. Figure 1.1: Scan Tool Connected to Vehicle DLC In addition, you can use the scan tool to look up special repair information and instructions without being connected to a vehicle. GM had a few of them in between 95 and early 96. As Roy stated you have what many call unofficially an OBD 1.5 car.
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