Accessory test adapter for vehicle diagnosis, testing and information system VAS5051B. The test adapter VAS5051B/4 serves as a means of testing diagnosis leads VAS5051B/1, VAS5051B/2 and VAS5051B/5A and VAS5051B/6A and also VAS5053/X. When carrying out the self-test by means of VAS5051B administration feature, the test adapter VAS5051B/4 should be connected between the respective diagnosis lead and the vehicle diagnosis connector, when instructed to do so, to check the diagnosis leads. TECHNICAL DATA: With test adapter VAS5051B/4, all physical interfaces, inc. CAN and J1850, can be checked. Connector color : Black