B1650 code, air bag light came on after being in a rear end collison, however no one was in the passenger seat is this normal?

This code refers to the front passenger airbag. There is a fault in the that part of the system so you will need to get a airbag specialist to look at it as soon as you can. Remember this is a safety feature on the vehicle so DON'T ignore it.

Definition of check engine code B1650:
LF mirror transmission reverse gear circuit malfunction

go google and type in--- fault code b1650 on toyota 2014 model--and there is a site --www.toyotapart.com which has a pdf down load and explanation of the fault
it concerns the passenger initialization of the air bag systems and how they are locked out if there are no passengers
it requires a special procedure to reset it
it covers recalls as well
I would suggest that you down load the pdf version, study it then take the car to a service dealer senter and have it fixed under warranty

you need to replace both

B1650 is driver seat recline forward short circuit to ground.

B1650 Occupant classification System malfunction there are 4 possible trouble area No.2 floor wire,Front RH seat,center air bag assemble.
B 1785 Front occupant Classification Sensor LH collision Detection there is only one possible location to set this code Front seat LH

Could your codes be different than mine? I could find anything starting with B, they all started with P.

I found no P1346 code, but found P1650 which is

P1650 Powertrain control module fault (quad driver 2)
This has to do with the transmission and if you have a manual transmission I think it doesn't apply.

If the airbag light is not coming on, this indicates a bulb is burnt out or the airbag control module is bad.

Good luck on this one.

If it is like a Chrysler, you will need to go to the dealer and have them redo the OCS. This has to do with the passenger airbag system and how much force it will send the air bag with.

This code means that the gas activated cylinders that tension the belts during a crash have gone off and need to be replaced

If the vehicle has been in a rear end collision, expect this. If not, it just may need to have the Occ Class Sys reset. Toyota Dealer only.