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OBD II port not working

OBD II port not working

Postby nerijusj [OP] » Jun 09 2012, 4:43am

Took my truck in for an inspection sticker today. The guy told me his computer can't connect to the OBD for some reason, so he couldn't pass me :? he said it might be a fuse or smth. Truck is 07 NBS Sierra CrewCab w/ 120 K miles. I checked the manual, but could not see anything in fuse section about OBD. I had my buddy hook up his code scanner tool after that, just to see if it'll work. No luck there as well, could not connect with truck. I'm lost at this point.....Any suggestions of what I should check?
I had battery replaced about 7 months ago, and had throttle boddies cleaned and sensor unhooked about the same time as battery. Other than that, except oil changes, I haven't done anything to the truck....electrical related.
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Re: OBD II port not working

Postby nerijusj [OP] » Jun 09 2012, 9:47pm

Any info on this? Help me out please, don't want to go to dealer....it's gotta be something simple....
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Re: OBD II port not working

Postby nerijusj [OP] » Jun 14 2012, 2:34am

Any thoughts anyone of what it might be???
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Re: OBD II port not working

Postby red16 » Jun 14 2012, 2:13pm

There is a fuse that controls the OBD port.I had the same problem.Do not remember which one,but there is one.
Good luck!!
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Re: OBD II port not working

Postby deathphoenix99 » Jun 14 2012, 2:19pm

I haven't checked to see what fuse exactly, but normally a fuse for either the cig lighter, aux outlet or radio tie into the OBD ports power as well.
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Re: OBD II port not working

Postby nerijusj [OP] » Jun 16 2012, 8:02pm

would that fuse be in under hood fuse box? or side of dash inside the truck? I looked at the fuse list in manual, but did not see anything about obd...
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Re: OBD II port not working

Postby red16 » Jun 16 2012, 10:43pm

Under the hood fuse box fuse# 46 Cigar lighter,Data Link Connector from the 1999 Factory service manual
Yours should be similar the lighter fuse Good Luck
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Re: OBD II port not working

Postby nerijusj [OP] » Jun 16 2012, 10:57pm

Thanks a lot! I'll try and give a look soon. Weird, everything else works, all cig lighter outlets and everything else.....just not the obd port. If it was a shared fuse, smth wouldn't work too, would it?
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Re: OBD II port not working

Postby red16 » Jun 16 2012, 11:14pm

My truck is a 2000,so may be different.The cig lighter is on the right side,of the 3 ports under the little cover in the dash.The other 2 to the left are power ports,the cig lighter does not work in those 2.Different style port. The service manual says pin 16 is the power on the obd port,the schematic shows it is tied to the cig lighter port,the one on the right.It is hot all the time,where the other 2 power ports are only hot with key on.
Yours is an 06,so may be different.Maybe a place to start tho. Good luck!!
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Re: OBD II port not working

Postby rodknocker » Jun 17 2012, 5:08am

has the same problem on my dad's 2000 2500 we found the fuse for marked cigar in the under hood fuse box blown changed it and it worked fine
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