Security System

Circuit Chart:

CIRCUIT CHART
Circuit assignments for the body control module (BCM) relating to security system:

SECURITY SYSTEM
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.

KEY-IN-IGNITION
When the ignition key is seated in the ignition switch, the key-in-ignition switch contacts close grounding circuit 80. The BCM monitors the state of the key-in-ignition switch, the state of the ignition switch (OFF, ACC or RUN) and the driver's door to control the key-in-ignition chime.