2004 Toyota Prius Owners Manual - Page 128

Km/h or MPH button Low temperature indicator light 24p005c 24p107 You can switch the display between km/h and MPH by pressing the button. This light comes on when the outside temperature is less than +3_C (37_F). When the "IG−ON" mode is turned on, this light comes on and goes out after a few seconds. If the outside temperature is less than +3_C (37_F) in the "IG−ON" mode, the light flashes three times and then stays on. If the outside temperature is higher than +3_C (37_F), the light flashes three times and then goes out. 116