Don't have a wiring diagram for your TV, but in some vehicles, the brake light switch is used to signal you have the brake on and activates the relay that allows you to shift out of park. Some electronic brake controllers use the same signal to tell the controller the brakes have been applied ( some use inertia) . If the wiring for the controller is not correct or has a bad ground, it could short or lower the signal to the relay which allows you to get out of park, Who installed the controller in the new vehicle? How is it grounded?
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