Where and what does the reset switch for the 1996Volvo 850 lookslike

Volvo 850 (1993-1995) Service Light Reset
Under the hood there are 2 diagnostic units (labeled A and B on the cover) next to the washer reservoir.
1. Turn on the ignition and open diagnostic unit A.
2. Locate the flylead (the test wire that is in the plastic holder).
3. Insert the flylead into socket 7.
4. Press the large round test button on the diagnostic unit 4 times, briefly but firmly.
5. When the LED flashes and then stays lit, it will accept the reset code.
6. The reset code for the service light is 1-5-1.
7. Press the large round test button firmly one time and then release it. The LED should be lit.
8. Press the button firmly 5 times and then release it. The LED should be lit.
9. Press the button firmly one more time and then release it. The LED will flash several times.
10. Turn off the ignition switch and replace the flylead in its holder and close the cover.
The Service Light has now been reset.