There are a few different options for adding Bluetooth functionality to an older Toyota factory radio that does not have an auxiliary input. Here are the steps for each option:

Option 1: Use a Bluetooth FM Transmitter

Purchase a Bluetooth FM transmitter. These devices typically plug into the cigarette lighter or power outlet of your car and allow you to stream audio from your phone to your car radio via FM frequency.
Turn on the FM transmitter and set it to an unused FM frequency on your car radio.
Pair your phone with the FM transmitter by following the manufacturer’s instructions. This typically involves pressing and holding a button on the FM transmitter until it enters pairing mode, and then selecting the FM transmitter on your phone’s Bluetooth settings.
Tune your car radio to the same FM frequency as the FM transmitter. You should now be able to stream audio from your phone to the car radio via Bluetooth.

Option 2: Use a Bluetooth Cassette Adapter

Purchase a Bluetooth cassette adapter. These devices allow you to stream audio from your phone to your car radio by playing the audio through a cassette tape that is inserted into the cassette player of the radio.
Insert the cassette adapter into the cassette player of your car radio or an aux input if your car come with one.
Pair your phone with the cassette adapter by following the manufacturer’s instructions. This typically involves pressing and holding a button on the cassette adapter until it enters pairing mode, and then selecting the cassette adapter on your phone’s Bluetooth settings.
Press play on the cassette adapter and the radio should start playing the audio from your phone through the cassette player.

Option 3: Use a Gizmo Guy Gadget Bluetooth Adapter That Connects to the Radio’s CD Changer Port

Purchase a Bluetooth adapter that is compatible with your Toyota radio’s CD changer port. These adapters allow you to stream audio from your phone to the radio by connecting to the CD changer port and emulating a CD changer.
Locate the CD changer port on the back of your radio. This is typically a round port with six or eight pins.
Connect the Bluetooth adapter to the CD changer port according to the manufacturer’s instructions.
Pair your phone with the Bluetooth adapter by following the manufacturer’s instructions. This typically involves pressing and holding a button on the adapter until it enters pairing mode, and then selecting the adapter on your phone’s Bluetooth settings.
Press the CD changer button on your radio and select the Bluetooth adapter as the source. You should now be able to stream audio from your phone to the radio via Bluetooth.

Option 4: Replace the Radio With a New Bluetooth-Enabled Radio

Purchase a new radio that has a built-in Bluetooth feature. Make sure to choose a radio that is compatible with your Toyota vehicle.
Disconnect the battery of your car to prevent any electrical accidents while working on the car.
Remove the old radio from the dashboard according to the manufacturer’s instructions. This may involve removing mounting screws, panels, or other hardware.
Disconnect the wiring harness from the back of the old radio.
Connect the wiring harness to the back of the new radio according to the manufacturer’s instructions.
Install the new radio in the dashboard according to the manufacturer’s instructions. This may involve screwing the radio into place, attaching mounting brackets, or reattaching panels or trim.
Reconnect the battery and turn on the car.
Follow the manufacturer’s instructions to pair your phone with the new radio via Bluetooth.

No matter which option you choose, the gizmo guy gadget is the easiest way to add bluetooth to toyota factory radio without Bluetooth.