I think there is a 12 volt constant in the Tundra radio wiring harness SybErk. I'll have a look at my Scosche wiring diagram tonight and see. I pretty sure that's right because I also mounted the Sirius unit (CD-SB10) under the cupholders and ran the 12 volts power and ground up to the Scosche wiring harnass.

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2007 Tundra Limited Double Cab 4x4 Super White
Volant CAI
Pioneer AVIC Z-2 (hard drive upgrade to AVIC Z-3)
Key FOB Tailgate Lock (courtesy of Toxarch)
OEM back-up camera w/flip down monitor microswitch mod
Sirius Satellite Radio
WeatherTech Floor Liners
20" OEM alloy wheels
Line-X Bed liner
UWS Black Powdercoat Low Profile Toolbox
DU-HA underseat storage unit
JC Whitney Black Nerf Bars
Lund Interceptor II Bug Shield
Tekonsha Voyager Brake Controller