Hi,
They are two different circuits. Also, I agree that it is odd. Fuse 16 powers the right rear window and it didn't blow if the right front window was disconnected. (if I understood correctly).
If the fuse fails as soon as you install it, disconnect one harness at a time (at each switch). See if there is one the stops the fuse issues.
Next, the power window switches have power at all times. When you actuate a switch, you are basically providing a ground path is a specific direction through the motor to make it operate. This is where it even gets more confusing. When you used the front switch on the rear window, it goes the opposite direction.
Here is what I believe may be happening. For the rear window to go down on its own, there has to be a ground path being provided at all times. Do me a favor and try this.
On the right front switch there will be a blue wire with a black tracer. That is the power wire from fuse 8. Disconnect the connector at the switch and see if fuse 8 blows.
On the right rear window switch there will be a white wire with a red tracer. Disconnect the switch and see if fuse 16 blows.
Next, there will be a white wire with a red tracer at both switches. Check to see if it provides 12v.
Let me know what you find.
Here is a link you may find helpful:
https://www.2carpros.com/articles/how-to-check-wiring
Also, I attached the wiring schematic for the circuit below. It is two pages long, but I had to cut each one in half to make it readable for you. I did overlap them and highlight wiring if interest.
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Tuesday, September 28th, 2021 AT 9:34 PM