ALDL connector?

Good afternoon,

The reason you cannot communicate is due to 1995 was a transition between OBD 1 and OBD 2.

You need a scan tool that reads OBD1 but has a cable that will communicate with the L terminal.

I had a snap-on scanner with the needed cable for communicating.

You need to call around to shops and see if anyone has that tool to read the system. The dealer most likely will not help as it is too old for them.

Roy

As Roy stated you have what many call unofficially an OBD 1.5 car. GM had a few of them in between 95 and early 96. The connector looks like an OBDI part but the system actually uses a hybrid of OBD I and II parts and protocols. They also used the OBD II connector the same way on a couple models. 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. The Snap-On MT2500 (Brick) with the correct cartridge will read them, as will the Tech II and the Tech 2000. The OTC Genisys will as well. Some dealers will have them setting on the shelf under 2 inches of dust while others will just wave you away. It depends on when they became GM dealerships and if the tool still works.
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. 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.

You are welcome.

Always glad to help.

Roy

If you use Ebay you can usually find them on there.

Here are a couple of eBay item numbers to give you an idea of the type of scanner that would work. MT2500 - 334099128547 Genisys - 133831212299 or 164862732215
I have one of each. The Genisys is a bit easier to use as it uses built in software and no cartridges.

That is the type of scanner, however you need the cable to connect to the early GM units. The software in them covers OBDI - OBD 1.5 and OBD II as long as you have the correct cable. The correct connector is in the image attached OTC 212653. Then there is the adapter harness that goes between the tool and the cable OTC 3305-72, that is used with all the cables with the round connection on them. That is the second image. You can still buy those cables new.
Look around on there and see what you can find. There are usually a few of them for sale as people decide they don't need them anymore. They are not super fast but they work and if you visit their site at OTC you can still get most of the parts and cables.

Check the description. It looks like 84 and 95 will not work with this code reader.

Roy

I don't believe it will work on your 95 because of the odd computer in your vehicle. Those generally worked with the earlier system where you could simply short out two pins to make the check engine light flash the codes. That ability doesn't exist on your car.

I would opt for a tool that will work on your vehicle. In this case it's difficult due to the system used. Unlike the earlier OBD I cars where a simple paper clip jumper would cause the light to flash, or the true OBD II vehicles where even the cheapest plug in code reader will work the ones in between like yours require a real scan tool to read and display the data. It makes it harder for the do it yourself folks to work on them because of that. Instead of a free clip or a $20.00 plug in tool you need a tool that is much more expensive and does far more than most people ever use. The up side is that because it is a true scan tool it has a lot more in it than just reading the codes and can show you testing data and much more.

The scan tools I mentioned both will work on your car. There are a couple others as well but those are not as easy to find as the Snap On and the Genisys units are.

Get used to the tool and you might find yourself helping out others with US cars over there. I have a friend in the Ukraine that does that, he is one of the "go to" guys if you have a US import there.

The M and D refer to the 8th digit in the VIN number identifying what engine would be in your car.

I attached the chart identifying the engine according to the letters.

Roy