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Is there any possibility that the battery was hooked up backwards? Even for a second?
Ok. That's common on these siennas.
At this point you will need to check to make sure voltage is getting to through the main fuse from the battery. Nothing works right? No headlights, radio, etc?
You will need a multi-meter to test this:
Check the fuse box for voltage to any of the fuses. This is done with the positive probe of your multi-meter touching the metal test tab of the fuse and the negative side on the battery- with your multi-meter set to DC volts.
I just wanted to check whether you still need help with this issue.
Please let me know if you do.
That makes sense. Please let me know if you need help in the future.