Security System
WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. However, it is still accessible from the selected car via links, so may be relevant.
The PASSLOCK™ sensor is powered by circuit 812. The PASSLOCK™ sensor is grounded by circuit 1057. PASSLOCK™ sensor data is supplied to the BCM by circuit 1836.
The PASSLOCK™ sensor data supplied to the BCM is in the form of V-codes or voltage codes. When the proper ignition key is turned in the ignition switch, the correct V-code is supplied to the BCM. The BCM responds by sending a serial data password to the engine controller allowing the engine to run.
The security resistor is bypassed under a tamper condition, possible external magnet applied to sensor. In this mode, a specific V-Code is supplied to the BCM. The vehicle will not start in this mode.