If you need to connect to the Bosch ME20 on a workbench using a boot-loader tool, K-Line interface, or OBD2 bench harness, you only need to wire a few essential pins to establish communication. Pin Connection Plug / Pin Number Wire Color (Typical Factory) Function Description Plug A / Pin 1 & Pin 2 Main Chassis Ground Permanent Power (+12V) Plug A / Pin 9 Red / Blue Constant Battery Power (Terminal 30) Ignition Power (+12V) Plug E / Pin 2 Black / Blue Switched Ignition Power (Terminal 15) K-Line Diagnostic Plug E / Pin 11 Green / White OBD2 Pin 7 Communication Steps for Safe Bench Connection
: Typically terminal 87 or specific pins depending on the connector section. bosch me20 pinout verified
The hum of the fluorescent lights was the only sound in Elias’s garage until the clicking started. On his workbench sat a silver box—a Bosch ME2.0 plucked from a salvaged 1998 E-Class. It was supposed to be a simple job: bench-test the unit, verify the signals, and ship it back to a client in Munich. If you need to connect to the Bosch