CAN Protection Strategy

When the perimeter alarm is armed, the BCM monitors the CAN. If a diagnostic scan tool is connected to the DLC, and an attempt is made to establish a session with the BCM, it activates the perimeter alarm.

Every time the BCM detects an unauthorized access (alarm activates), all BCM programming, PID monitoring and self-test sessions are blocked for 10 minutes. At the end of the 10 minute time period, the horn chirps to indicate the 1 minute of opportunity to communicate with the BCM and program keys if none are available. Refer to: Passive Anti-Theft System (PATS) - System Operation and Component Description .