2004 toyota sienna airbag system

Question edited for clarity.
Question moved to model category.

In this link

https://www.autozone.com/diy/repair-guides/toyota-sienna-2000-06-firing-orders-repair-guide-p-0996b43f80378b68

and others plus video

https://www.google.com/search?q=2004+Toyota+Sienna+3.3+firing+order

..

this is not in the fsm (factory service manual)
so only the dealer can help

I don't think that the solenoid is available separately from the starter motor for this model. A remanufactured starter motor for an 02 Sienna should be easy to acquire through a local auto parts shop for just over $100. You may have to be a contorsionist to get to it, though in the relatively small engine bay.

I have written up all the steps on how to remove the bumper from a 2004 Toyota Sienna, including detailed pictures, on my blog at: John Fixes Stuff How to Remove the Front Bumper on 2004 2007 Toyota Sienna

FYI - all Toyota parts are proprietary you need to buy the OEM PARTS. Most of the times I go to the Toyota dealership and try to make a deal with the parts sales person. You would be amazed that most of them will give you a nice price. Just let them know how much is that aftermarket price. Most of the times they will match the aftermarket part sell. s price. Or you could visit www.usatoyotaparts.com for a better price... I hope this helps

Brake pads and rotors can be purchased at any auto parts store.

you can buy, or order them in dealer. but try to ask some auto wreckers or auto recyclers more cheaper than dealer

Certainly check with your Toyota Dealer as the vehicle is hopefully is still under factory warranty at that milage. The Air bag light flashing is certainly cause for concern, and having an airbag set off without impact can be very dangerous and it is best to have a professional working on your airbag issues.

it is harness connection issue. Under driver seat check for any loose connection. make sure all of them connected properly by pressing connector together and it should the problem

I hope you did not purchase your Toyota used; one of the worst scams around is selling used vehicles with missing or useless air bags.  The replacement cost on these is in the upper 3 digits. Because of the possibility of triggering the air bag by accident, I don't advise that someone not trained should attempt to troubleshoot these.