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The wrench light is usually just a service due indicator. It's supposed to tell you when you are due for service based on time and mileage. The jump start might have just confused the computer. Do you have any kind of a number or letter combination in the display?
B1- That just means that you are due for an oil change according to the trip computer. If you plan to change the oil yourself you can reset the light through the menu. I can walk you through it. If you are going to have a shop do it then they will normally reset it for you.
The wrench will usually come on once the oil life % drops to a certain level- normally below 20%.
Please let me know if you need additional info.