The power module is in the trunk on the right side behind the door in trunk. Have someone push the button while you see if the sound is from there. It's purpose is to shut off things if you are getting too much voltage. Undervoltage effects it too. I have a power module and a integrated supply module for sale on eBay right now for cheap. Let me know if you need them. The power module new is $486.00. It can easily be swapped out yourself but it does need to be coded to you car. Here are some pics.