Central gateway control unit, component description - GF54.21-P-4170GZ

MODEL 164 up to Model Year 8 

Fig 1: Identifying Central Gateway Control Unit Component

Courtesy of MERCEDES-BENZ USA

Location 

The central gateway control unit (N93) is located in the driver footwell on the left in the direction of travel.

Tasks 

• Gateway between the CAN class B and CAN class C as well as CAN class D
• Global variant coding (with networked control units the central gateway transmits global information such as model series and national version to the CAN-B control unit, CAN-C control unit and CAN-D control unit)
• Router between CAN-class B and diagnostic CAN
• Router between CAN class C and diagnostic CAN
• Diagnosis between CAN class B and diagnostic CAN
• Diagnosis between CAN-class C and diagnostic CAN
• Data container

In the vehicles there are 3 CAN buses which are connected by the central gateway control unit:

• Diagnostic CAN with a transfer rate of 500 kbit/s
• CAN-Class B with a transfer rate of 83.3 kbit/s
• CAN-Class C with a transfer rate of 500 kbit/s