Hi,
Let's start with the data link connector. I attached a pic of the connector below. I highlighted pin 16 and circled 4 and 5.
Check pin 16 for battery voltage at all times. Pins 4 and 5 are grounds. Confirm there is continuity to ground.
If there is no power, I need you to check the DLC fuse in the instrument panel fuse box. I attached two pics below. Pic 2 is for a late production and pic 3 is an early production vehicle. They moved the fuse. LOL When you check this fuse, not only is it important to confirm the fuse is good, but also you need to confirm there is power to and from the fuse.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
Do this and let me know the results.
Take care,
Joe
See pics below.
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Tuesday, November 8th, 2022 AT 9:03 PM