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From the Scion website

https://www.scion.com/faqs#maintenan...g_term_storage

LONG TERM STORAGE

Q
What should I do to prepare my Scion vehicle for long-term storage (1-6 months)?
A
Our vehicles are designed to be driven routinely and not be stored for a long period of time. If due to an unexpected situation and the vehicle has to be left unused for a while, our recommendations for storing the vehicle with less negative impact to the systems on board are listed below:

INSTRUCTIONS:

Before storing the vehicle:

Have the engine oil changed
Have the engine coolant changed if due during time of storage
Fill up the fuel tank with the appropriate gasoline for your vehicle
Wash the vehicle; use high-pressure water or steam to clean underneath
Check underneath the floor mats to ensure the carpet is dry
If there are any paint chips, have them repaired

When storing the vehicle:

Drive vehicle above 35-40 mph for over 20-25 minutes prior to shutting off the engine. Disconnect the black negative (-) battery cable
Leave the parking brake off
Raise the vehicle on a level surface and place on jack stands or blocks to prevent flat spots on the tires
If stored in a temperate, ventilated garage, the windows can be left slightly open
Cover the vehicle
Operate the air conditioning once a month to ensure proper lubrication

When bringing the vehicle out of storage:

Have the battery charged and reconnect the black negative (-) battery cable
Check fluid levels and add as needed
Check for any leaks underneath the vehicle
Check and inflate the tires to the correct pressure before taking the vehicle off the jack stands or blocks
After starting the engine, observe the warning lights; if any remain illuminated, have the issue addressed by your Toyota Scion dealership as appropriate
Check the brake pedal for normal feel (height and firmness) before shifting the transmission
Take the vehicle to your Toyota Scion dealership for general inspection
To determine your vehicle's normal operating temperature, please refer to the section of your Owner's Manual that describes the engine coolant temperature gauge.
Note: If you are planning to store your vehicle for more than 6 months, please consult a company that specializes in long-term vehicle storage.

*There are many variations in the step-by-step procedures used when checking fluids or charging batteries, and varying skill levels of individuals. These instructions cannot anticipate all circumstances or provide advice and caution on each. If you are in doubt concerning your ability or have any questions, consult your local Toyota Scion dealership and have the work performed by an experienced technician.