there is a relay that will disable the key start,when you use the remote.
if the relay has gone bad ,it is not closing the starter loop on the key circuit.
these are usually dpdt type.(double pole double throw.).check and make sure one of the clips has not fallen off.if it is not the relay,and it is the brain,you will have to see if the manufacturer is still in business .check with the people that put it in.....you might have a valet switch,too that you can try to see if it will start.