JUST THE FACTS 12v power to OBD2 pin 9 (orange) and Blue ECU pins 19 and 20 (pinkred) ground to obd2 pin 4-5 and Blue ECU pins 1 now connect pin 7 (purple OBD2) to Blue ECU pin 58 (serial data line) youre done. Now you take the serial data wire, purple wire Blue connector 58 (lower right side) to obd2 port 7 (upper right side) Now before anything else, plug it in and see if you can access the ecu with whatever you are using on the obd2 side, if you can connectreadwrite, youre set, clean it up if you care and ship it. Loving You A Thousand Times Ost Koreanturk Serial Data Wire Then you take your ground, connect it to Blue pin 1 (upper left) and pins 4 and 5, (upper middle) on the obd2 connector 6. You want to take the power wire from your power source, and connect it to Blue 19 and 20, (upper right two pins) and OBD2 port 9 (bottom left). Youre also only using 4 wires on this connector. Make sure it has orange black and purple wires, that will make the rest easy Once you have the parts (assembly) 1. I usually cut mine out of blazers and cavaliers since there are a million at the yard and they are already pinned for GM stuff basically b. Loving You A Thousand Times Ost Koreanturk Serial Data Wire.
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