Assuming you need to replace just the actuator:
The cost of the replacement part itself will be anywhere from $75-$200, depending on where you purchase it and the model/year of your RAV4. If you need to hire a professional mechanic to do the work for you, expect to pay an additional $100-$300 for labor. So all in all, the total cost to replace an actuator on a Toyota RAV4 will be somewhere between $175-$500.