Detect Communication Protocol, Power Supply and Grounding CircuitThis is a professional automotive tool for the OBDII diagnostic link connector which offers easy access to the OBDIl connector for monitoring signals of protocol, power and grounds conveniently and safely. When unconfirmed signals are detected, the breakout box can also be connected to a multimeter or oscilloscope for further testing. LED IndicatorsThe LED lights on the OBD2 breakout box can quickly indicate whether the power and grounding of the OBDII interface on the car are normal. Yellow LED (Pin 2/6/7/10/14/15) lights up to show communication with a scan tool and protocol identification; Green LED (Pin 4/5) lights up to indicate good ground. The Red LED (Pin 16) lights up to show there is power. 16 Pin OBD InterfaceThe input jack layout simulates the 16-pin layout of the OBDII interface, making more tests quick and intuitive. All 16 pins of OBDII can be easily connected when the decoder communicates with