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Vehicles have a varied number of electronic control modules for the engine , ABS , air bags , body control , anti- theft , keyless entry etc.. When the vehicle is parked ,key off these modules are suppose to enter into sleep mode. Some times they don't go to sleep , bad module ,wiring problem or a light is staying on. How to Find Parasitic Battery Drain
there is a bad relay that is feeding back causing this. start pulling your relays until you find it good luck, hope this helps you.if you vehicle has day time running lights it can also be the( drl )module.
This is not due to the multifunction switch (blinker switch) but a common problem with the light control module. This module is located under the driver side dash next to the OBD Reader plug. The problem inside the light control module is a $4 resistor that overheats and sometimes causes the headlights to fail after only a short period of running time. This can be replaced if you're good at soldering, or you can replace the whole module anywhere from $75-200 (junkyard to dealer)