OBD reader does not power up

Hi,

I attached two pics related to power supply. Check the fuses I circled. Also, note in picture 2 that power goes to the horn relay via the DLC under hood.

Pics 3 and 4 are the entire data link connector schematic. I had to cut the schematic in two so it was readable for you. I did overlap the two to make it easy to follow. In pic 4, I circled two grounds. If you find the fuses are good and power is being distributed, confirm the ground is good.


________________________

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If you want to check the horn relay, here is a link that explains how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know what you find.

Take care,
Joe