Toyota Prius 2010 Repair Manual page 375

(2) With the power switch on (IG), turn the power switch from off to on (ACC) to on (IG) 3 times within 5
seconds (on (IG) → off → on (ACC) → on (IG) → off → on (ACC) → on (IG) → off → on (ACC) → on
(IG)).
HINT:
Operate the power switch 9 times.
(3) Turn the solar ventilation switch from off to on 3 times within 3 seconds (off → on → off → on → off →
on) of operating the power switch.
HINT:
Operate the solar ventilation switch 5 times.
(4) Check that test mode is activated and the blower motor rotates at a constant speed.
HINT:
When the solar ventilation switch is turned off, the blower motor will stop and when the solar ventilation switch
is turned on, the blower motor will operate.
When the power switch is turned off, the solar ventilation system returns to normal control.
2010 Toyota Prius Repair Manual