Please make sure SIM card with full balance.4.2 Device light descriptionColor Representsred poweryellow GSM signalgreen GPS signalNote: the three lights must be stable lighting on represent device canwork normally. All lights will turn off after 5 minutes, if you call thedevice number, lights will wake up.5 Power Wires connection5.1 4P power wire connection as below:1)4P power red wire connects to vehicle power positive +2)4P power black wire connects to vehicle power negative -3)4P power yellow wire connects to oil pump or circuit control wires4)4P power green wire connects to ACC ignition wire5)other wires connecting to relative accessories in package.5.2 Device wiring diagram