Information - trailer hitch maintenance: check operation

Fig 1: Test cable VAS 1537 A:

Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE:

• To perform this check, a trailer with no faults in the wiring and lights, or a trailer test cable VAS 1537 A is required. 
• Please note that, if a VAS 1537 A trailer test cable is used, only vehicles with a 13-pin plug can be checked. 
• The test cable can be attached to the trailer socket to locate faults. The plug has 13 pins; adapters are required for 7-pin sockets. Because of the build-up of heat, ensure that a thermal circuit breaker is used in the test cable. 

Item	Designation	Source	Explanation
	Socket tester V. A. G. 1537 A	→ "See Workshop Equipment Manual, Chapter 3.0"