Playing ginee pig ... guinee pig ... bloody hamster!
Attached is a pic I just took inside my steering wheel. It's a piece of cake to remove but I have two warnings about it.
1) Remove the airbag fuse (I did do this one). It's the second fuse from the top, in the left hand row, in the fuse holder beside the glove box. This should avoid problems with the airbag going off. Mine is still intact, I had no problems there.
2) Remove the horn fuse (I did not do this one). It's under the bonnet somewhere. My horn beeped three times and thankfully this only procured a single shout from my wife, who at the moment is sick in bed with the flu and there's only two pieces of gyprock between the horn and her head. I am a lucky man.
Warnings over! Let's look at the picture and figure out what it all means.
At the bottom is the "Wire SRS Airbag Restraint". It's about as thick as a coathanger ... or a Ford Falcon replacement radio antenna if you don't know what a coathanger is. There's nothing behind it, you can give it a good push, just don't slip off it. I used a 5mm-wide flat-bladed Stanley screwdriver. There's a black-insulated cable nearby that runs across the steering wheel - it's the cruise control cable.
Now, with a good enough push on that wire, the entire centre module pops out on its own as it is spring mounted. The wire you're pushing is part of a restraint that goes around the whole bottom, you can see it rising up just to the left of the words "Torx bolt". It retains the airbag in 4 places.
On the top left is the "Cruise Control Plug". The cable for this runs around the bottom and past that hole you were poking in, up to the cruise control switches. There are several wires missing in the plug - I'm guessing those are the audio controls. I didn't disassemble further to see if there is anything on the other side of that cable connector. That's for another day.
You can also see the torx bolt. It's just one bolt, easily reachable from the front face of the steering wheel by pushing the airbag module to the side. Unscrew it and pop the side piece out.
Easy! Repaint, replace. I'll be doing mine when the time comes.
As for the audio controls, I think we should take a poke at the Maxima gear. I would not be surprised if they just make the one module that fits several cars and just has different part numbers and prices.