I was just wondering if anyone knew if it was possible to upgrade my steering wheel with radio controls. I have an '04 SR5 with the '05 Camry NAV. If so, what would the part number and price be?

I'm sure it is possible, but you'll probably have to add a few pins to the factory harness connector.

I also have the '05 Camry navigation system, and I definitely prefer using the steering wheel controls instead of touching the screen all the time.

Give it a shot... it's definitely worth it.

I'm currently looking into it because I desperately want them as well. Anyway, here are some preliminary cost estimates, I don't have the part numbers:

Airbag with cutouts for audio controls: $505.52
Left hand audio controls: $67.39
Right hand blank control: $14.83 (not sure about this one)
Leather steering wheel (optional): $100 (if you can find a nice used one on eBay) to $600 if you want to order a new one.

I bought a leather/wood steering wheel recently, so I've just been waiting to find out about the wiring before I go ahead an order the parts to add the both the audio controls and my new steering wheel in.

EDIT: I checked my stereo and it looks like it's already prewired for the steering wheel audio controls. The R5 connector is in place and has the 3 wires corresponding to the audio controls. I guess Toyota thinks it's more cost effective to include the wiring on all 4Runners since the majority of them are equipped with the audio controls.

Thanks for the quick response. WOW!!! I did not realize it was soooo $$$$.