Check drive authorization, function - GF80.57-P-3001S

Model 215, 220 

Function 

After turning the transmitter key (A8/1) in the EIS control unit (N73) from position 1 to position 2, the ME-SFI control unit (N3/10) (on vehicles with gasoline engines) or the CDI control unit (N3/9) (only model 220 with diesel engines) are supplied with power. Following the encrypted data exchange between the

ME-SFI control unit (N3/10) or the CDI control unit (N3/9) and the EIS control unit (N73) the drive authorization code is calculated in parallel.

This calculation is then compared in the ME-SFI control unit (N3/10) or CDI control unit (N3/9)If verification is successful, the start authorization is issued. If the start-up is not enabled, this is stored in the DTC memory in the ME-SFI control unit (N3/10) or CDI control unit (N3/9). If the start authorization is given, the transmitter key receives an appropriate message via infrared from the electronic ignition switch control unit A8/1(N73).