Here goes (from AllData):
1. Turn the ignition switch to the "ON" position and check that the Low Tire Pressure Warning Light blinks.
2. Press the valve core to reduce the tire inflation pressure rapidly by 6 psi (0.4 kgf/sq.cm 40 kPa) or more within 30 seconds. If the tire inflation pressure is NOT reduced by 6 psi (0.4 kgf/sq.cm, 40 kPa) or more within 30 seconds, the tire pressure sensing transmitters will NOT be activated.
This operation is required for the system to be activated and must be performed for each tire (including the spare tire), one at a time.
Check that the Low Tire Pressure Warning Light goes OFF after all the tire pressure sensing transmitters are activated.
NOTE : After all tire pressure sensing transmitters are activated, the Low Tire Pressure Warning Light will come ON whenever the tire pressure in any of the tires falls below 24 - 27 psi (1.65- 1.9 kgm/sq.cm, 165 - 185 kPa).
3. Check that the sleep mode Diagnostic Trouble Codes are NOT stored in the system. If the sleep mode Diagnostic Trouble Codes are stored, increase the tire inflation pressure of all 5 tires to 44 psi (3.0 kgm/sq.cm, 300 kpa) and repeat steps 1 - 3.
4. If the Low Tire Pressure Warning Light comes ON, increase the tire inflation pressure to 32 psi (2.2 kgm/sq.cm, 220 kpa) and check that the warning light goes OFF.
5. Adjust the tire pressure to the specified level as indicated on the tire and loading information label on the vehicle. Check that the Low Tire Pressure Warning Light is OFF.
HINT:
^ If there is a great difference between the current temperature of the tire and wheel (for example: shop temperature) and expected temperature (outdoor temperature), this needs to be considered when adjusting the tire pressure.
^ Adjust the tire pressure when the tires are cold.
