For "top" or bench-mode access (for flashing/reading), professional tools often use the following standard setup: Power (+12V) : Pin 18 (Permanent) and Pin 3/37 (Switched). Ground (-) : Pins 1 and 2. Communication
The SIMOS 33A is most commonly found in and 1.8L TSI engines (EA211 engine family). simos 33a pinout top