Note: In many SIMOS 33A diagrams, the connector containing the power and communication lines (the logic side) is physically positioned on the outer edge (or "top" when viewed from a specific angle), separate from the heavy-current coil/injector pins.

The Simos 33A manages various engine sensors and actuators. Key connections include: 31, 33, 34, 46 Injectors 1 through 4 (firing control) Throttle Actuator (V60) Electronic Power Control (EPC) motor drive Knock Sensors 102, 103, 110 Signals from G61 and G66 sensors Engine Speed (G28) 90, 97, 92 Inductive sender for RPM tracking Programming and Immoblizer Access

K-Line (Diagnostic interface for tools like VAG 1551 or VAS 5051).