One problem related to battery dead has been reported for the 2005 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Sienna based on all problems reported for the 2005 Sienna.
1) battery drains dead only less than 30 minutes of power on (either side door left open, headlight not turned off completely, interior light on, etc. ) which never happened with previous Toyotas I owned. In three years I own this model, I had to jump charge my battery at least 10 times in different occasions due to above. 2) automatic headlight feature does not turn off the headlight when engine is turned off, draining battery. 3) driver side rear sliding door does not open sometimes using remote key, inside control, or outside door handle 4) both side rear sliding doors sometimes do not open all the way using the outside door handle 5) both side rear sliding doors would not open when outside temperature is below freezing.