So no progress on my 2000 Blazer LS nightmare. Security light stays on solid if trying to relearn. Selector light stays lit all the time as well as odometer, no interior lights, no courtesy lights, no key left in ignition buzzer, no horn , tailgate hatch button doesn't work at all, tries to start then dies. Tried all I can think of replaced ignition switch, breakers, checked fuses. Only thing left seems to be bcm. So questions I have is what do you have to match on a bcm? I can see that the part number should match but what about the bar code number under it and then the color blocks under it? I found a module with the same part number 09366430 CRAK and the bar code number is close mine is 87630M5003572X7 and the replacement number is 87630M50094842W. Your thoughts? I don't know the cost to reflash but doubt if the cost would be worth it. Anybody have experience with cost to reflash a bcm at a dealer? Thanks in advance all

 

Following.

Is there any connection between the bar code number and your VIN?

Is there a mapping to the options for your Blazer?