Whoa! Access to these is by laptop and requires a program. The loss of signal error is usually there when you disconnect the equipment from the VM. it`s the quickest way to disable the system but it gives the error code. Usually, only top managers have the access to these. the tech is given an over ride card to change some settings and needs a password. This system is quite involved and and gives management total control over the truck, wireless. Raymond usually is the only one to program these.