Operation CHARM: Car repair manuals for everyone.

System Operation

The PASSLOCK TM System is designed to prevent vehicle operation if the mechanical key is not used to start the vehicle. The mechanical key, in normal operation, will turn the PASSLOCK TM Lock Cylinder. The PASSLOCK TM Lock Cylinder will relay a Resistance Code (R-Code) to the Instrument Cluster . The Instrument Cluster will determine the validity of the R-Code within a preset time window started from an Ignition Switch input and will send a coded password to the Powertrain Control Module (PCM). When the Powertrain Control Module (PCM) receives the correct code, it will allow the Fuel Injectors to operate normally.