Perform Function Check On Trailer Hitch With Electrical Release - AR31.19-P-1451LW

MODEL 205.0 with CODE 550 (Trailer coupling) 

Fig 1: Trailer Hitch Release Switch Components Location - Model 205.0 With Code 550

Courtesy of MERCEDES-BENZ USA

	Check
1	Switch on ignition
2	Unlock ball neck	If the ball neck is not engaged, the LED or the trailer hitch release switch (S62/24) starts to flash. A warning message appears in the instrument cluster.
3	Engage ball neck into one of the two end positions	The LED on the trailer hitch release switch (S62/24) goes off. The warning message in the instrument cluster disappears.
4	Switch off ignition