ok so i was going to put a little more fuel and timing in my cousins cadilac, which i have a license for and have tuned a few months back. we data logged a pass. i edited the program, went out to the car to Write Entire, and it failed validating the vcm. now the car has activated a security system and it wont gather any of the vehicles information. it keeps saying Unable to locate the vcm. The car will not start. Turn the key on and the fuel pump comes on. it will not crank. navigation says theft system. We have tried both keys. It will not let me read the vcm either. any ideas? Please post anything, i need HELP. Thanks