Service of the coolant reservoir system requires first removing three panels: the rear No. 2 floor board, rear deck floor box, and rear No. 3 floor board. Remove the battery cable negative terminal before letting at least 90 seconds pass to avoid Air Bag and seat belt pretensioner activation. Start by removing the radiator support opening cover followed by engine under covers (LH and RH) together with front bumper cover yet retaining part of the front fender liner LH. Drain the engine coolant through the drain cock plug while being cautious since heat from the reservoir has not fully cooled down. Disassembling the coolant reservoir requires removing two hoses followed by disconnecting water pump motor and temperature sensor connectors before removing the nut and four bolts when securing the Coolant Reservoir tightly to avert bracket deformation. When installing the coolant reservoir assembly begin by clamping the two claws and stud bolt onto the vehicle side and fasten with four bolts and a nut before torquing to 19 Nm (194 kgf-cm, 14 ft. lbs.) while ensuring to press the bracket in front of the vehicle during bolt tightening of 1 and 2. The water pump motor and temperature sensor connectors need to be attached before joining both hoses. Replace all parts by reattaching the negative battery terminal connection then reinstalling the rear No. 3 floor board plus rear deck floor box and rear No. 2 floor board. The service completion includes adding engine coolant and leak detection while placing back the front fender liner LH followed by front bumper cover and engine under covers (RH and LH) and radiator support opening cover. After removing the battery perform initialization because several systems need this step before reconnecting the power supply.