1. Park your vehicle on a level surface and apply the parking brake.
2. Open the trunk or luggage compartment of your Grand Scenic.
3. Locate the spare wheel. It is usually stored in a compartment under the trunk floor.
4. Remove the cover or panel that protects the spare wheel.
5. Locate the spare wheel release mechanism. On most Renault Grand Scenic models, it is a small lever or knob located near the spare wheel.
6. Pull or turn the release mechanism to loosen the spare wheel.
7. Remove the spare wheel from the storage compartment.
8. Place the spare wheel on the ground next to the vehicle.
9. Jack up the vehicle until the flat tire is off the ground.
10. Remove the lug nuts from the flat tire and take off the tire.
11. Place the spare wheel on the hub and tighten the lug nuts.
12. Lower the vehicle and remove the jack.
13. Replace the spare tire cover or panel and close the trunk.
Please note that the specific steps may vary slightly depending on the model and year of your Grand Scenic. It's always a good idea to refer to the vehicle owner's manual for specific instructions.