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Bench wiring diagrams for Bosch MED17 / MED40 / MED177 / MED41 ECUs (T96, T58, T105, T91 pins)

Pin-by-pin diagrams for bench-connecting the Bosch MED petrol ECUs in the Mercedes FBS4 range, needed for data reading, virginizing and personalization when OBDII is not enough. The wire colors are those of the CB401 cable.

Procedure

1. MED40 BOSCH, MED17.7.1 TC1797 V1, MED17.7.3 TC1797, MED17.7.3.1 TC1797 MED177, MED17.7.5 TC1793 MED177, MED177AMG, MED177V6LA: T96 PIN 83 - PWM; T96 PIN 58 - PWM; T58 PIN 2 - GND-; T58 PIN 5 - 12V+; T58 PIN 15 - IGN; T58 PIN 41 - CAN-H; T58 PIN 54 - CAN-L.
2. MED17.7.1 TC1797 V2, MED17.7.2 TC1797, MED40AMG: T96 PIN 81 - PWM; T96 PIN 58 - PWM; T58 PIN 3 - 12V+; T58 PIN 4 - GND-; T58 PIN 15 - IGN; T58 PIN 41 - CAN-H; T58 PIN 54 - CAN-L.
3. MED17.7.8 TC1797 MED177: T105 PIN 13 - PWM; T105 PIN 34 - PWM; T91 PIN 1 - GND; T91 PIN 5 - B+; T91 PIN 50 - IGN; T91 PIN 79 - CAN H; T91 PIN 80 - CAN L.
4. MED40 (MED17.7.1): T96 PIN 58 - PWM; T96 PIN 83 - PWM; T58 PIN 2 - GND; T58 PIN 5 - B+ 12V; T58 PIN 15 - IGN; T58 PIN 41 - CAN H; T58 PIN 54 - CAN L.
5. MED40 (MED17.7.2) and MED17.7.1 V2: T96 PIN 81 - PWM; T96 PIN 58 - PWM; T58 PIN 2 - GND; T58 PIN 5 - B+ 12V; T58 PIN 15 - IGN; T58 PIN 41 - CAN H; T58 PIN 54 - CAN L.
6. MED41 (MED17.7.7) V1 and V2: follow the dedicated diagrams in the manual using the recommended CB403 cable; on the bench the MED41 (MED17.7.7) can also be worked with DS Box + CB401 and, in specific cases, with the CB403.
7. Connect the AVDI to the ZN051 DS Box (CB402 cable), wire everything up according to the ECU diagram, power up the bench and only then open the FBS4 Manager, select ECU and press "Info" to check communication.

Reference screenshots