I got :
ground - OBD pin 16 : 12.22v
ground - LM7805 Input: 11.45v
ground - LM7805 Output: 4.94v
there is a M7 Diode right after the soldering of the pin 16 on the pcb ( first component) :
ground - M7 Diode entrace : 12.22v
ground - M7 Diode exit : 11.45v
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