Mazda remote start/alarm system 0000-8F-H16 need to remove

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! With aftermarket alarm and remote start systems like the Mazda part #0000-8F-H16, removing them can be tricky, especially since they’re often wired into multiple circuits, including the ignition and sometimes even the brake switch—potentially explaining your brake light issue and that P0703 code. If you’re set on removing it yourself, don’t just cut the power wire. Instead, locate the control module for the alarm (usually under the dash near the fuse box) and disconnect each wire, ideally matching up with a wiring diagram for that specific system. Cutting random wires without a clear plan could cause further issues, like disabling your ignition entirely. A good compromise is to have a shop help you safely remove it—they can also ensure that the brake switch and other systems are properly reconnected. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.