Adding a beep when the interior lights are on?

Has anyone done something like this? (I'd want a several minute delay for when loading and unloading. A cloth in the back was caught in the hatch latch - preventing the interior lights from turning off, and that resulted in a dead battery. Not a good situation.) This text is from the Brave Search AI-critter. "Adding a beep when the interior lights are on is not a standard factory feature on the 2012 Toyota Prius, and there is no official, simple method to add this circuit through user-accessible settings or button combinations."

"However, a custom electrical modification can be implemented by a qualified technician or DIY enthusiast. The most practical approach involves:

• Sensing the interior light circuit: Tap into the wiring that powers the interior lights (typically the dome light or map lights).
  
• Using a relay or electronic module: When the interior lights are turned on, the module triggers a buzzer or piezo beeper.
  
• Mounting the beeper: Install a small, low-volume beeper in a discreet location (e.g., near the fuse box or under the dash) to avoid excessive noise.
  
• Power source: Use the vehicle’s 12V system, with proper fusing and grounding."
  

 

I don't really understand what you are trying to say.

Our 2012 makes no "noises" when the doors are open, nor when backing up.

In order to avoid a dead 12v battery - due to human error, a buzzer - with a delay (long enough to cover common lengths of time to have the doors open - so it's silent then), but after that to warn of an undesired drain - makes strategic sense.