No idea if the Grand has similarities with the California, but check the following.
Does pump run with tap on? If not check fuses. Normally a 5 or 10 amp fuse. No idea where they are found on the Grand.
If fuses OK, check under sink, there should be 2 wires to tap, follow wires and there should be a plug. Unplug connector and bridge with a paper clip or similar the 2 pins on the connector that is not on the wires leading to tap. If water still not flowing then probably the pump.
Simple trick, open tap and blow down the tap spout vigorously to clear any air lock. If still no water then remove pump from water tank. May just be jammed or may need replacing.