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I'm pretty sure you'll get a little change back from the dealer if you gave them $500 to take care of the issue. It cost me $375 to have the dealer replace the left front buttons on my LS.
some of it might be do to contact corrosion over time - its very typically for these buttons to start working intermittently on older cars as they age. You may be able to spray some electrical contact cleaner into the controls - just be sure to protect the wood and plastic on the wheel and dash with a couple of old towels.
bringing up an old thread. longhoang where u able to resolve this issue as i am having the same problems. my mode, up/down station, and horn works but the volume controls dont. can it be a fuse? are is the fuse for the steering wheel buttons one entity?
has anyone experience this problem and got it fixed? im about to take tackle this problem myself and would like a few pointers. its not the fuse since the lights light up on the buttoms, my next guess would be lose wires or corroded contact points.
Read past threads it's not a fuse issue but either contact erosion/rust or need to reboot the radio unit from the back. Not simple, i have same issue now.