Final answer:
If the customer doesn't provide the inflation pressure, the technician should advise the customer on estimating the pressure and provide a general guideline based on the vehicle and tire size.
Step-by-step explanation:
If the customer does not provide the inflation pressure, the courtesy technician should advise the customer on estimating the pressure. The technician can recommend using a standard pressure value as a starting point but caution that it may not be the exact pressure needed for optimal performance. By estimating the pressure based on the type of vehicle and tire size, the technician can provide a general guideline for the customer. Additionally, the technician can advise the customer to refer to the owner's manual or consult a tire professional for more accurate information.