Where is OBD 1 located?

1989 GMC SIERRA
117,000 MILES • 5.7L • V8 • 4WD • MANUAL
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PCBRIAN
  • MEMBER
  • 1 POST
OBD1 location.
Nov 26, 2022 at 4:29 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,193 POSTS
  • ASE Certified Mechanic
Hi,

If you are looking for the data link connector (DLC), it is in the vehicle under the dash on the driver's side of the vehicle. It should be visible.

I attached a pic below showing the location. See if you are able to find it. If you can't let me know. Also, here is a link that explains how to retrieve codes from the OBD1 system for a GM vehicle.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Let me know if this helps or if you have other questions.

Take care,

Joe

See pic below.
Nov 26, 2022 at 11:13 PM
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