flashing M and S lights, is it the xyz switch?

i have fitted a reconditioned one but am struggling to get it set so the gear lever reads P D R N 123
and because it isnt set it wont power up starter ,relays seem ok and fuses, any advice or tips please

D2? You need to read the codes with a nanocom or hawkey etc… and report to the Discovery forum. Include a bit more info.

OK thanks working on it

i have an issue that is a problem, my red light is flashing to say the alarm is on, but it isnt because you can open the doors without the alarm sounding, also i have been told this is why i cant set up the xyz switch
so my problem is if i disconnect the battery and kill everthing i will need to reactivate the door entry code by the key in the door, not a problem i have the code but my key will not rotate the door lock left or right, i think the tumblers are shot
i have been searching for a new or used tumbler with the key but i am struggling to get one ,any suggetions please