Yaris 2007 Battery and Diesel filter warning lights in cold weather

[Exiwolfman]

the filter is to remove water from fuel im thinking if filter is full at low temp it freezes , i know that when i used a Ford with a diesel engine it had a filter that i had to drain or i would have problems ...in winter times if i did not put the truck on heater over night it would not turn over with temp below -20 .