So I have a 96 LS Blazer and I decided to get one of the OEM key fobs. I can't seem to get the car to activate the programming mode though. I know about the pins in the OBD2 reader and nothing happens when I put a jumper in them. Fuse isn't blown and the OBD2 port has power. Anyone have any ideas?

 

How many pins does your data port have?

George

 

It has 16 pins

 

and which PIN numbers are populated with metal contacts?

George

 

The infamous bastard ODB 1.5 can apparently exist in 1994-1996 GM vehicles with 12 or 16 pin diagnostic connectors and various pinouts. Ours appear to be mostly or all 1995 but ...

You said you have a 16 pin connector so now we should verify that the following pins are populated with metal contacts: 2, 4, 5, 8, 9, 13, 16. If so then jumping 8 and 4 should cause the doors to lock/unlock to signal the initialization of keyless programming mode. Does this happen? If not try 8/5 because 5 is also a ground like 4.


George

 

For reference (note the connector shape):





George

 

In relation to the diagram, I have pins 2, 4, 5, and 8 for the top row. For the bottom row I have 9 and 16.

 

I forgot to mention, I already tried using 5 as a ground as well but to no avail.

 

So you jumper 8/4 or 8/5 and the locks do not react?


George

 

Yes sir that is correct