"95" ALDL Connector OBD2

OK, I have a "95" 4 dr. 4x4 S-10 Blazer. I was trying to run a scan on the Data Link Connector, but it comes up with No Vehicle Detected. In reviewing the pin out on the Data Link Connector. I find that the pin out differ's from the OBD2 cable on my scanner. I'm finding out the "95" Blazer's had 2 ALDL Connnectors. OBD1(12 pin) & OBD2(16 pin). I don't know if anyone has messed around with the ALDL connector or not. This Blazer was just purchased about 6 months ago and I'm slowly restoring it.
Now, Does anyone out there know what the color coding of the wiring on the ALDL Connector and which pins should have wires. Here is the pin out that I have.

1. Vacant
2. Wired
3. Vacant
4. Wired
5. Wired
6. Vacant
7. Vacant
8. Vacant
9. Wired
10. Vacant
11. Vacant
12. Vacant
13. Wired
14. Vacant
15. Vacant
16. Wired

The easier rule of thumb for the 95 is this...

ECM under the dash w/ ODBI connector under the dash=ODBI.5 Use paperclip or ODBI scan tool

ECM under the hood w/ ODBII connector under the dash=ODBII Use Standard generic ODBII scanner

ECM under the dash w/ ODBI connector under the dash=ODBI.5 fucked up.. Use ODBI scanner (Tech II or Snap-on) w/ ODBII converter module. Cannot use a standard scanner nor the paper clip trick..

Mine's Rlith's third variant. Totally screwed up. Needed to use a special OBD-II connector that had a slot in the back of it to accept a pin re-wiring card. Once hooked up and the scantool fed the correct information, it reads out DTC's and module data streams easily enough. However, nothing is better than a Tech-II scan tool that the dealership has for pulling data out of my rig. Man, that ECM setup is a PIG. :P

Hey Wolfox, Yours sounds like the same type of OBD2 connector I have. Try take a look at your pin out and see if it matches up with mine. If so, Then I'd like to ask you where did you get that special OBD2 connector from. Or I wonder if its possible to rewire my ALDL connector on my "95" to match up with the OBD2 cables that I have now.

Hey Wolfox, Yours sounds like the same type of OBD2 connector I have. Try take a look at your pin out and see if it matches up with mine. If so, Then I'd like to ask you where did you get that special OBD2 connector from. Or I wonder if its possible to rewire my ALDL connector on my "95" to match up with the OBD2 cables that I have now.

Do you have the ECM on top of your coolant overflow tank on the passenger side front wheel well?

It on top of the Pass. fender well.

OBDII scanner should be working fine for you then.

You can pick up a scantool that has a "Pre-96" GM test lead on it that will make it work with a standard OBD-II scantool. However, you graduate immediately from a $75 tool to a $340 one. :P I go to a local GM mechanic buddy of mine's shop. He has the hookup to talk to my OBD-II look-alike knee bolster connector with the ECM under the glovebox. I posted before on this, complete with part numbers for the tool that one can purchase over the counter at Autozone. Do a search on "wolfox+scan+tool" and that should dredge it up...

EDIT: Man, there are PROBLEMS with this site lately. I cannot find the post where I dropped off the specs on the scantool available over the counter at Autozone that *will* read '95 GM trucks with OBD-1 ECM with an OBD-II knee bolster link-up that's NOT the 12-pin ALDL link. If you have the 12-pin ALDL, well, it reads that too. The tool can be seen here:

http://www.autozone.com/servlet/UiBroker?UseCase=C001&UserAction=performMoreDetail&Parameters=TRUE%7C%7EScanners+%26+Testers%7C%7ENON E%7C%7EActron++++++++++++++++++++++++++++++Super+A utoscanner+Kit+OBD+I+%26+II%7C%7ENONE%7C%7EFALSE%7 C%7EFALSE%7C%7E431998%7C%7E427%7C%7ECP9150%7C%7EOB D+I+And+II+Ready+Kit+With+Hard+Plastic+Carrying+Ca se%7C%7E%24379.99%7C%7ENONE%7C%7ENONE%7C%7ENONE%7C %7ENONE%7C%7E7.25%7C%7ENONE%7C%7EW%7C%7EACM%7C%7Et rue

It's an Actron OBD-I & OBD-II super scanner kit.

Actron part number: CP9150

Autozone's price: $379.99

That's what I thought. However the when I use my scanner which is the autoxray 6000. It doesn't reconize the vehicle. According to Wolfox he says that he had the same type of trouble and he needed a special connector that could rearange the pin set. Could you take a look at your pin out and see if it matches up with mine below? If not, Could you give me your oin out and color codes of the wires. I'm thing maybe I could rearange my ALDL connector to match the normal ones.

OK, I have a "95" 4 dr. 4x4 S-10 Blazer. I was trying to run a scan on the Data Link Connector, but it comes up with No Vehicle Detected. In reviewing the pin out on the Data Link Connector. I find that the pin out differ's from the OBD2 cable on my scanner. I'm finding out the "95" Blazer's had 2 ALDL Connnectors. OBD1(12 pin) & OBD2(16 pin). I don't know if anyone has messed around with the ALDL connector or not. This Blazer was just purchased about 6 months ago and I'm slowly restoring it.
Now, Does anyone out there know what the color coding of the wiring on the ALDL Connector and which pins should have wires. Here is the pin out that I have.

1. Vacant
2. Wired
3. Vacant
4. Wired
5. Wired
6. Vacant
7. Vacant
8. Vacant
9. Wired
10. Vacant
11. Vacant
12. Vacant
13. Wired
14. Vacant
15. Vacant
16. Wired

When I get home after changing my battery out (It's over 5 years old now and she's starting to crank/start poorly) I will take a photograph of as much wiring and the socket itself as possible for you without taking apart my knee bolster. Stay tuned!

That's what I thought. However the when I use my scanner which is the autoxray 6000. It doesn't reconize the vehicle. According to Wolfox he says that he had the same type of trouble and he needed a special connector that could rearange the pin set. Could you take a look at your pin out and see if it matches up with mine below? If not, Could you give me your oin out and color codes of the wires. I'm thing maybe I could rearange my ALDL connector to match the normal ones.

Thanks Wolfox. Be looking forward to see them.........

Ack! Sorry to report that I got my name pulled from the hat when it came time to call a technician. I just got home from dropping into the office again and nowhere in a mood to crawl around in the truck tonight. Let me see what happens over the next few days to get the photos to you before the weekend. Sorry man, I got my electronic leash yanked. (Cell phone) One of these days I am going to flush the damn thing.

Ack! Sorry to report that I got my name pulled from the hat when it came time to call a technician. I just got home from dropping into the office again and nowhere in a mood to crawl around in the truck tonight. Let me see what happens over the next few days to get the photos to you before the weekend. Sorry man, I got my electronic leash yanked. (Cell phone) One of these days I am going to flush the damn thing.

No problem. I just got finished replacing the flywheel and I still have to replace the CPI, so I'll be working on that in the mean time. The nut kit and CPI should be coming in on Thursday. I just got done looking at my ALDL connector. Here is the color code breakdown.
Pin #
2 Purple
4 Black
5 Black w/white strip
9 Brown
13 Dark Orange
16 Light Orange

Gabe, you have ODBII. (Ecm under the hood) And a standard ODBII connector... What you need to do is set your scanner for GENERIC, not a specific vehicle and it should connect for you.

Rlith, OK I'll try it tonite when I get home from work. I don't think that the autoxray 6000 has a generic setting, but I never thought about looking for it either. I'll let you know what I come up with. Thanks............

Rlith, OK. No luck, There is no generic option. So now I'm back to the wiring of the ALDL connector. I need to find a color code wiring diagram for the connector, and see if the wiring is off. Then I can redo the connector. Any idea's.......

Rlith, OK. No luck, There is no generic option. So now I'm back to the wiring of the ALDL connector. I need to find a color code wiring diagram for the connector, and see if the wiring is off. Then I can redo the connector. Any idea's.......

That's really not going to work as the 1st revision ODBII in the 95 has different protocols than the 96+ (again why generic is needed). You can have your ECM reflashed to the latest code by the dealer which will make it fully and officially ODBII compliant. The odbii connector under your dash isn't wired any differently than 96+ as I said it's going to boil down to a protocol issue and what the expected responses from your ecm would be for your scanner. To under stand this, simply go to autozone and grab one of their code scanners (they will come out to the truck with you) and it will read fine...(because of generic coding)

Rlith. Thanks, However here in Hawaii we don't have a Autozone Dealership. I guess they don't like water or something. I was hoping to find a fix, so I wouldn't have to go back to the Dealer and have them try to rip me off for $135. and thats just fro them to tell you that your car is broken. Ha Ha...................

Buy a generic scanner, use it, return it...:)

I'd rather try other options first. If there is no way to get my scanner to read the “95”. Then I’ll probably end up buying a generic. Hopefully I can find a rewiring fix on the ALDL connector.

Again, rewiring won't fix it if your scanner is expecting a certain software response from the ECM. I would call the manufacturer of your scan unit to find out if there is an update that will handle your ecm.

Again, rewiring won't fix it if your scanner is expecting a certain software response from the ECM. I would call the manufacturer of your scan unit to find out if there is an update that will handle your ecm.

OK, I'll try calling Autoxray. Thanks Again............

OK, I'll try calling Autoxray. Thanks Again............
For what it is worth, I have a late model '95 S-10 4 door Blazer and have used my Auto X-Ray 5000 to read it. Only the trick is to tell the X-Ray that it is a 96. Seems to work OK for me this way.
Good luck!

OK Jsneden, I tried to trick it using the "96". No luck. I'm still trying The Help desk at Autoxray. I think they mite be closed for the weekend. Thanks for the idea.

OK, Talked with tech support from Autoxray. They informed me that the "95" Blazer was a very weird year. That was the year that GM started the transition from OBD1 to OBD11. Some cars were compliant and some weren’t, but they all have the OBD11 ALDL connector. So where does this leave us. Its kind of a hit and miss situation. You can try and use the Autoxray OBD11 special cable that is designed for the 1994 – 1995 GM cars. If that doesn’t work. Then you can try and use the Actron super scanner, or just go the your GM Dealer and have them hook you up with there Auto Tech and rip you off.
Well I tried all of the above and finally went to the dealer to get ripped off. They told me that they can not read my car. They told me that the wiring from my ALDL connector is open to the Computer. The good thing is. The dealer couldn’t charge me for the diagnostics. Freebie!!!!!! That’s a first coming from the dealer. So now I’m going to start probing the wiring to find the open.
Does anyone have the test values for the wire harness? If so, that would really help. Thanks………

I am sorry about not getting photos up and other media that I have been wanting to do. My ISP is being a complete TOOL and blocking ports left and right, to include common, everyday ones in which one can simply upload via FTP. I am working on a work-around, seeing if my remote websites support SSH. Thankfully, my ISP has NOT ruined SSH for me yet. My apologies to all. *sigh*