Auto OBD2 Breakout Box This is an Breakout Box OBDII Protocol Detector for the car OBDII diagnostic link connector, which provides easy access to the OBDII connector so that after connecting the automotive OBDII system, the different color LEDs on the OBD2 junction box can monitor the protocol, power and ground signals conveniently and safely, good helps detect if the problem is with the vehicle's ECU or decoder. LED flashing of OBDII Breakout Box LEDs provide a quick indication of OBDII Protocol Detect power or ground issues. When the code reader is communicating with the vehicle, the yellow LED (pin 2/6/7/10/14/15) lights up with a signal waveform. If a normal car ground is detected, the green LED (pin 4/5) will be on solid. If it is detected that the car power supply is normal, the red LED (Pin16) will be always on. Digital display and 16-pin interface design Auto 16 pin dlc breakout box an LED display design is added to first eliminate the voltage problem of the OBD