DY29 4MM 16 Pin OBD II Automotive Protocol Diagnostic Detector Tester Tool

DY29 is a straight-through OBDII data line detector. 1 x DY29Protocol Diagnostic Detector Tester. When the body power is normal, the red LED of pin 16 is always on. When the body is properly grounded, the green LEDs on pins 4 and 5 are solid.