Recently I noticed that the passenger side seat belt light sometimes is flashing, sometimes is not (when is not buckled). Anyone else has such problem?
The drivers side light does stay on if the belt isn't fastened. This is the typical newer vehicle reminder to buckle up.
On the other hand, the passenger side light flashes because the air bag can be activated and deactiviated with the ignition key. My thought is that since it can be deactivated for the purpose of installing a child seat up front, they (mothers, engineers, lawyers, bureaucrats, etc.) wanted the visual warning that the air bag system was on and that someone/thing is in the seat to be very obvious and annoying.
I too don't like the fact that stuff I ocassionally throw into the seat causes it to flash, but I do like the extra and obvious warning it provides.
You mentioned you can disable the passenger airbag with the ignition key. How? I don't see a place to insert the key like my Tacoma has. On the Tacoma there is a panel with a key slot that says Passenger air bag on-off.
The tundras have a disable switch on the right of the center console. The passenger seatbelt light is on the end right and a key switch is there to disable the air bag.
I asked a sequoia person the same question. Will let you know when I get an answer if you don't get one sooner.
That switch is only on the pickups. The cut off is for children and if you are in a vehicle like the Sequoia, the safest place for a child is in the back seat.....thus no switch.