How to turn off the front passenger airbag only

Under the passenger seat you'll find three wiring harnesses. One of them is for the four sensors to detect if there's someone (or some dog) in the seat. Disconnect that harness and you'll be good to go. The only side effect is that the dashboard will show some icon (can't remember which one). But you can simply ignore it.

I've taken my passenger seat out before, and that pretty much disabled the passenger airbag sensors.

 

The harness is connected to four sensors situated at the four corners under the seat (the manual actually has a diagram showing where these sensors are located). When I took the seat out, I did look at these harnesses, but now I can't remember for sure which one is the airbag sensor one, and I don't want to tell you the wrong one.

The best way to find it, IMO, is to unscrew the four floor bolts then lean the seat backward to expose its underside. You can then VERY easily figure out which harness it is by tracing the wires. To release the plastic harness, a small flathead screwdriver would be very helpful.

 

I think I found it. This is a picture I took while I had the passenger seat leaned back.
There are four wiring harnesses under the passenger seat (only three on the driver side).
The grey harness on the right (still plugged in) is the one connected to the four sensors.

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To test this, what you can do is unplug this harness then turn the car on to see if there's a red
"No Airbag" icon on your regular dashboard. Also, put something heavy in the front seat (like your dog)
and see if the passenger Airbag light comes on. If it doesn't then that means you've disconnected
the right plug.