Check the actual horn. Clean the contact points and apply dielectric grease to the contact points. Test the horn for resistance. Check the horn relay.
There could be several reasons why a Toyota Sienna will not start. the most common problem would be a dead battery.
Check fuses
moisture on the ignition coils.spray them with silicon spray.
NO there is a 3yr 36,000 mile warranty on it.
Yes it could.
Yes, that filter fits a 2004 Toyota Sienna. But, I would not recommend a Fram filter. Purolator, Bosch, & Wix, all make superior filters to the Fram.
I have same problem and can not figure it out,I have 2 remote but non of them works, must be something witrh the car.
The sienna is a more stylish car that from most people would say the sienna overall is a better van and i would go with that, but the grand caravan is a less-expensive van that is still ( but not as good as the sienna as i said ) a very good van, i would say go with the sienna if you're buying a van but if it is not in the budget go with a caravan as a second choice.
The trip odometer switch on the odometer itself is the dimmer on Toyota Sienna. If you turn this switch all the way to the left your panel would become dark. Simply turn the switch to the right and all panel lights would come on. I had a similar problem and the manual bailed me out.
check the battery
I would check with Toyota and make sure its not covered by recall. Our 2004 had both of them fail and Toyota replaced them for free.
It could be a worn belt for the fan but i am not completely sure so i would probably call the dealer you bought it from and ask. its nothing to serious though so dont worry to much.