More than likely this is a brake light switch issue if the third brake light is out as well.
However, if not then the TIPM is the issue. I attached the wiring diagram below that we need to use to test the voltage to determine if the TIPM is the issue.
https://www.2carpros.com/articles/how-to-check-wiring
I also attached the process for the TIPM as I suspect this is the issue.
Please let us know if you have other questions. Thanks
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Thursday, June 10th, 2021 AT 6:22 PM