2003 Impala Passlock Wiring Diagram - The core of GM Security Systems is the engine immobilizer. It goes by many different names, like Passkey, VATS or Passlock etc. depending on the car manufacturer that is installing them and on a number of small variants.. Warning: If you are seeking to fix a Grand Am Security system, read this entire article carefully. Do not miss a single word. Follow each step explicitly. Don't skip any step. 9/24/2010 There is now an alternate method of doing this modification which involves removing the radio.. GM Security Systems are killing cars all over the US. Only solution is to disable them permanently. This is what NEWROCKIES Inc. is all about..