The clock doesn't work on my 2002 Sienna. The official Toyota Sienna Repair Manual says to check the DOME fuse under the hood. If the fuse is bad, replace it. If the fuse is good, replace the clock.
(I'm not about to spend $$$$ to have a new clock installed when I can get an LCD auto clock for under $5).
Then I discover that an intermittent short in my cell phone charger was blowing the fuses on both the cigarette lighter and the power adapter. When I replaced the cigarette lighter fuse, located behind a panel on the dash, the clock started working!!!
I wonder how many Toyota service departments would have solved this problem honestly.
Lena