Redtegra’s wiring looks correct, but it is not at all the way the stock wiring works. I personally prefer to keep things functioning as stock as possible.
If you would like to use a relay, but setup the fan the same way as stock, then you need to set the relay to switch for ground, not power - remember our fan wiring is setup to be a ground switch circuit. In your case with an aftermarket relay:
30: To body ground
85: To #21 fuse (or hot lead of your choice)
86: To YEL/GRN wire from ECT Switch
87: To NEGATIVE terminal on fan motor
#12 fuse to POSITIVE terminal on fan motor
As you can see that’s pretty much exactly opposite of redtegra’s method since the relay is being switched with the ground AND supplying GROUND to the fan motor, not power. This is exactly how the stock fan wiring is setup, so if you wire this way you can trust that any troubleshooting you do with wiring down the road can be trusted to follow the Helms troubleshooting procedures. The above wiring can be confirmed via pg 24-2 in the Helms, and is meant only to represent US spec AC equipped vehicles. Also, be careful with wire colors, in general you can trust what it says in the Helms, but it’s a good idea to check with a multi-meter or test light to confirm. As you can see there’s one wire that changes from YEL/BLK to BLK/YEL - so make sure to read the ENTIRE diagram).
Now that I’ve typed all of that, I’ve got an even better way for you to wire your fan. If you’d like, you can simplify things and do away with relays altogether. Here is how the stock radiator fan is wired for US spec non/AC G2’s (again, you can check against pg 24-2 of the Helms).
YEL/BLK wire from #21 fuse (15A) leads directly to the positive terminal of the fan
YEL/GRN wire from ECT switch leads directly to the negative terminal on the fan
No relays, or extra bits, just plain and simple ground switch circuit. This is how I’ve wired multiple DA/DB’s when removing the AC. (however AC equipped cars get their hot lead from the #12 fuse (15A), so I just use that wire since it’s already in the proper location and was previously used for fan power.)
Lastly, I feel I should mention that some newer Hondas (ITR for example) still uses an ECT switch but the relay is a POS switch circuit. So the fan switch turns the relay ON, but the relay sends power to the fan.