That all depends on what your Murano is worth. If you still owe 11,500 but the vehicle is worth 12,000, then you have $500 in equity. Basically, you come out $500 ahead, and that amount will be subtracted from your new loan.
In the likely event that your Murano is worth less than what you owe on it, then you are "upside-down" in your car loan. If you owe 11,500 but the Murano is only worth 10,000, then you have another $1500 that you'll either need to pay off at the time you make your new loan, or have it tacked onto the new loan.
Beware, though: most banks and reputable car dealers will NOT allow you to get a loan for an amount greater than the new vehicle is worth. Let's say your new vehicle is $17,000. If the bank gives you a loan for $18,500 (17k plus the 1,500 from your old loan) and you total the vehicle the next day, the insurance company is only going to write a check for $17,000, so the bank will lose out on $1,500.