astrostart 2504 2000 chev blazer no crank

Put  a Astrostart 2504 into a 2000 Chevy Blazer yesterday. The remote starter will not crank the vehicle. It does not power up the starter wire (P4-5 blu wire on unit). I can start the engine with the key and then take over the vehicle with  the remote start no problem, it just won't crank the starter. I have checked and triple checked my connections and can't find anything wrong. Do I have a bad brain or is it a programming issue that I have overlooked?                    

FWIW I used a PLJX bypass module but I know it's not a passlock issue because the starter wire never gets pwered up at all by the remote start, also if it was a passlock issue this vehicle would start and die.