Principles of Operation

PRINCIPLES OF OPERATION

The vehicle security module is on the universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communication network. To support several vehicle subsystems, the vehicle security module permits inter-module and scan tool communications.

The vehicle security module controls the remote keyless entry (RKE) system. The vehicle security module monitors the door lock/unlock switch inputs from the interior door lock switches. When the vehicle security module receives an unlock/lock command from any door lock control switch, the vehicle security module activates the door lock actuators.

The vehicle security module provides a ground for the horn relay solenoid coil if the PANIC button on the RKE transmitter is pressed. At this time, the horn will sound in regular intervals until the PANIC function is turned off, or after 2 minutes have elapsed.

The vehicle security module controls the autolamp subsystem. The autolamp subsystem provides light-sensitive automatic on/off control of the headlamps and parking lamps.

The vehicle security module monitors the door ajar inputs and provides information to the instrument cluster in order for the instrument cluster to close the interior lamps relay, providing voltage to the interior lamps and the running board lamps (if equipped). If the vehicle is not equipped with a vehicle security module, the door ajar switches are hardwired to the instrument cluster.