External view connector (male) and DLC (female).
| 
				 
					  | 
			
				 
  | 
			
				 
					  | 
		
Unused contact pads for the car manufacturers use for their purposes.
To determine which diagnostic Protocol is used on a specific car, with sufficient share of probability it is possible according to the presence/absence of contacts in the connector OBD-II:
| 
				 Protocol  | 
			
				 Pin 2  | 
			
				 Pin 6  | 
			
				 Pin 7  | 
			
				 Pin 10  | 
			
				 Pin 14  | 
		
| 
				 ISO 9141/14230  | 
			
				 
  | 
			
				 
  | 
			
				 +  | 
			
				 
  | 
			
				 
  | 
		
| 
				 J1850 PWM  | 
			
				 +  | 
			
				 
  | 
			
				 
  | 
			
				 +  | 
			
				 
  | 
		
| 
				 J1850 VPW  | 
			
				 +  | 
			
				 
  | 
			
				 
  | 
			
				 
  | 
			
				 
  | 
		
| 
				 ISO 15765 CAN  | 
			
				 
  | 
			
				 +  | 
			
				 
  | 
			
				 
  | 
			
				 +  | 
		
| 
				 Region  | 
			
				 Mandatory support OBD  | 
		
| 
				 USA  | 
			
				 Vehicles production since 1996  | 
		
| 
				 Canada  | 
			
				 Models in production since 1998  | 
		
| 
				 Europe  | 
			
				 Vehicles production in 2000/2001  | 
		
| 
				 Europe (diesel)  | 
			
				 Vehicles production since 2004  | 
		
| 
				 Australia  | 
			
				 Vehicles production in 2006.  | 
		
| 
				 The rest of the country  | 
			
				 Not regulated  |