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Air pump relay location/task/design/function - GF14.30-P-3106AM

ENGINE 113.990/991/993 

ENGINE 113.992/995 up to Model Year 8 

Fig 1: Identifying Air Injection, Pump Relay And Secondary Air Pump Relay Of Different Models
G07871120Courtesy of MERCEDES-BENZ USA
  Air pump relay location Model 211, 219 GF14.30-P-3106-01TA
    Model 215, 220 GF14.30-P-3106-01M
    Model 230 GF14.30-P-3106-01R
    Model 463 GF14.30-P-3106-01GA 
  Air pump relay task The relay actuates the electric air pump for the air injection.  
  Air pump relay design The relay is a 4-pin plug relay.  
  Air pump relay function When actuating by means of the ME control unit (N3/10) with a ground signal, the relay closes its power contact and thus supplies the electric air pump with voltage from "circuit 87".