Circuit Description

The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate. The Passlock controller reads the coded Passlock™ data signal. The data consists of a voltage generated by a voltage divider network created between the Passlock assembly and the Passlock™ controller. If the data is correct, indicating rotation of the lock cylinder with the proper mechanically cut key, then the Passlock™ controller sends a password to the Powertrain controller over the class 2 bus to indicate that starter engagement should be allowed. The Passlock™ controller also interfaces with the driver displays subsystem to indicate, via a Security telltale, the Passlock™ subsystem's status and acute subsystem failures.

The components of the Passlock™ System are as follows:

• The ignition switch
• The body control module (BCM)
• The security indicator on the instrument cluster
• The engine control module (ECM)