Recreated an EWS3 and two transponders to replace a knacked EWS4.3, coded it to a virgin ECM, then hoyed it into a box and posted it to someone who knows a lot more about these cars than me
GM 73220121-5
SA 612748C08540040A-1
VN 1800001043-W
There was no memory drivers seat coding in the original ZCS......now fixed
Brian