Good call, it sounds like the internal amplifier has gone out which is common. I would install a rebuilt or aftermarket unit. Here is a video of the job being done on a similar car, but the procedure is the same. I have included instructions for your car in the images below.
https://youtu.be/1bIa3jdJWVQ?si=yqeqwOUMVu1kWDgn
Here are a bunch of units for about $100 from Amazon:
https://amzn.to/3P7nzqo
Check out the images (below). Please let us know what you find.
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Tuesday, August 22nd, 2023 AT 12:18 PM