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In the 2019 Toyota Camry, there are four speaker wires that run from the head unit to the door speakers. These wires may change colors after passing through the processor, so you should look for specific colored wires at the back of the head unit: grey with light green stripe, grey with red stripe, grey with blue stripe, and grey with dark green stripe. Connecting your new head unit to these wires is essential for proper functionality.
You'll need to refer to the owner's manual or parts manual to locate this information, or you can also search online on Toyota's website.