OBS II connector not working

[Djcgmc02]

When I connect MY OBS II analyzer into my connector under dash (02 GMC SIERRA 4X4 5.3L) it does not activate analyzer when I turn key switch over. What could cause this problem? I need to turn off dash warning lights the correct way.

[dsr611]

Check the fuse...If I remember correctly, it's the cigarette lighter fuse

[rjgti]

or a broken wire at obdII port

[M3eater]

Don't know if it's common on these vehicles, but we do have a fairly common issue on BMWs with the pins in the OBD-II port pushing back into the housing and not making contact with the reader (or power programmer) harness plug. Wouldn't hurt to visually inspect the plug housing for any pins that may be dislodged and pushed back through the housing a bit.