Onboard diagnostics plug not connecting to tool?

2005 GMC ENVOY
182,000 MILES • 6 CYL • 4WD • AUTOMATIC
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CHRIS DAKE
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So, I have a friend that came by today with his vehicle listed above his OBD Plug isn't not connecting to my scan tool, same thing happened at the parts store as well.
What's the best way to troubleshoot the plug to find the issue to recover the trouble codes he needs. Any and all advice or suggestions will be greatly appreciated. I can provide Pictures and or more vehicle info if need be. Thank you guys.
Jul 11, 2024 at 7:38 PM
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JACOBANDNICKOLAS
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Hi,

First, I attached a pic below of the DLC. First, check to make sure there is battery voltage to pin 16. That should be present at all times.

If there is power, then check for continuity to ground at pins 4 and 5.

If you find there is no power to pin 16, check fuse 13 in the under-hood fuse box. That is what powers the scan tool. (see pic 2 below)

Let me know what you find.

Take care,

Joe

See pics below.
Images (Click to enlarge)
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Jul 11, 2024 at 9:21 PM
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CHRIS DAKE
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  • 27 POSTS
Blown fuse was the issue. Thanks guys.
Jul 12, 2024 at 6:40 PM
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JACOBANDNICKOLAS
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Hi,

You are very welcome. That was an easy one... Thank God!!! LOL

Take care and feel free to come back anytime in the future.

Joe
Jul 12, 2024 at 7:41 PM