Sandip

Hello! Your proposed pinout is incomplete, and the ECU will not wake up or establish communication on the bench with only those connections. Bosch MED17.7.1 requires a dedicated ignition wake-up signal (Terminal 15) on a specific small pin, plus proper CAN bus network termination.Here is the correct, full bench pinout configuration for the Bosch MED17.7.1 (M278 Engine) to communicate with your scanner/multiplexer:1. Power and Ground Connections:Permanent Battery (+12V / Terminal 30): Connect to Large Pin 1 and Large Pin 3Ground (GND / Terminal 31): Connect to Large Pin 2 and Large Pin 4Ignition Switch (+12V / Terminal 15 WAKE-UP): Connect to Small Pin 87 (Crucial step: without +12V on pin 87, the internal microprocessor will stay asleep).2. Diagnostic CAN Bus Connections:CAN High (CAN-H): Small Pin 54CAN Low (CAN-L): Small Pin 413. Critical Bench Step (CAN Termination):Because you are working "on the bench" outside the vehicle's interior wiring harness, there is no central gateway (CGW) to terminate the communication network. You must bridge a 120-Ohm resistor directly between your CAN-H (Pin 54) and CAN-L (Pin 41) wires. Without this resistor, the data signals will reflect back and cause a "No Communication / Link Error" on your scanner.Connect it with this layout, and your multiplexer will read the MED17.7.1 perfectly on the bench using either Xentry or Vediamo (via MED177.cbf).