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Message: <blockquote data-quote="ORVietVet" data-source="post: 28465" data-attributes="member: 9438">Yea, service mode is to allow the rear brake work for the ones with the electronic brake switch. Then reset after brake service. Maintenance Mode, on Toyota hybrids is for the coolant refill. When the system empties, the cold engine gets coolant poured in it. When the fluid is full in engine and you go to maintenance mode, the engine is ran at 2000 rpm and fan cycles 2 times and then the hot coolant then is allowed to transfer to the radiator and then you top off the coolant level and drive and top off again. Once you do the refill, before road test, you start the engine again and it resets out of maintenance mode.</blockquote>