26-02-2021, 09:46 PM
Here is a simple illustration of the OBD-II port located on the underside of the dash, near the driver's left knee:
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\.01.02.03.04.05.06.07.08../
.\09.10.11.12.13.14.15.16./
..------------------------
Grounding pin 1 is the way to obtain any stored error codes. You can ground it to a chassis point, any other earth, or most usually (because it's closest and easiest) pin 4.
I use a short piece of wire with stripped ends for the desired effect. A paperclip...