2003 trailblazer obd port location. Look in the upper left quadrant of the image. The norm states that the port must be located inside the vehicle passenger compartment. Short story long, the fuse for the cigarette lighter socket (the one on the left) also protects the 12v pin at the OBD2 port. To diagnose your vehicle yourself, download our EOBD-Facile car diagnostic software. The location of the OBD-II port can vary between models and years, but it is typically found under the dashboard near the steering column. I have a "U1000 No state of health" code recurring. I'm so frustrated I'm shaking. The locations can differ based on the year, make, and model of your car. Watch this video and learn how to find Jan 23, 2021 ยท Diagnostics port not working properly My OBD-II port does not work properly. But again the fuse is good. rf5 7f v2bp p0d lzap rdmp0 a8hmtx hk9n7cx oeu5 uum6w9