Rear Switching Module, Component Description - GF80.61-P-4110A

Model 223 

with code 871 (Sensor system for trunk lid opening/closing) 

Courtesy of MERCEDES-BENZ USA

The numbers on the pins indicate the pin numbering of the slots.

Fig 1: Rear Switching Module Components Location - Model 223 With Code 871

Courtesy of MERCEDES-BENZ USA

Location