Two of the three bulbs in my "Fasten Belts" light have been out since I purchased by 9-5. I decided it was finally time to replace those bulbs.
I purchased replacement bulbs from Memotronics Electronic Components. It was an excellent shopping experience. I ordered five 2721 bulbs for less than fifty cents each. That is much cheaper than other online sources I found. I was unable to find a local source for 2721 bulbs. The bulbs arrived securely in my mailbox a week later.
Removal and Replacement:
Use a small screwdriver on the forward edge of the dome light lens to carefully pry it loose and then set it aside. This exposes the one size-24 Torx screw that holds the plastic trim of the console.
Remove the Torx screw and pull the trim down. Don't pull too hard because there are wires attached to the thermometer and microphone. This exposes the three light sockets for the fasten belt sign.
You will want to use some small pliers or tweezers to carefully remove the old bulbs because the space up there is tight. I suggest putting on rubber gloves at this point to keep skin oil off of the new bulbs to extend life and reduce discoloration. The new bulbs then press back into the sockets. I was able to do this with my gloved fingers, you might need a combination of tweezers and fingers to get the bulbs in place.
You can see the two new bulbs on the right and middle, they are a little longer than the bulbs that were in the light before. Now you will want to turn on the ignition to see if all the lights come on before you reinstall the trim, screw, and lens.
And here is the finished product; a fully lit "Fasten Belts" light.