I've researched this on the internet and apparently the trip odometer button also serves as the dimmer for the dashboard lights. If you turn it (anti)-clockwise, your dash lights should come on. Its mentioned obscurely in the manual.
The 2008 Toyota Sienna has 24 valves.
The 2008 Toyota Sienna has a V6 engine.
The 2008 Toyota Sienna is a gas-powered vehicle.
The 2008 Toyota Sienna has a 5-speed automatic.
The maximum payload of the 2008 Toyota Sienna is 1513 lbs..
The 2008 Toyota Sienna is 16 ft. 9 in. (201 in.) long.
The curb weight of the 2008 Toyota Sienna is 4177 lbs..
The 2008 Toyota Sienna runs on regular unleaded.
The 2008 Toyota Sienna has double overhead cam (DOHC).
The 2008 Toyota Sienna's turning circle is 36.8 ft..
The height of the 2008 Toyota Sienna is 5 ft. 8.9 in. (68.9 in.).
The 2008 Toyota Sienna has a drag coefficient of 0.30 Cd.