"There is a ‘Play’ button on the JBL Bluetooth speaker case, and this is wired into the PIC18F chip. When this button is pressed, the burst of CAN messages changes slightly and they instruct the door ECU to unlock the doors (as if the ‘unlock’ button on the wireless key had been pressed). The thieves can then unhook the CAN Injector, get into the car, and drive it away."