2003 Toyota Prius Owners Manual - Page 96

Coolant temperature indicator and warning lights45. Low coolant temperature indicator light in blue 24p013 24p010a 24p003b High coolant temperature warning light in red At the first blinking of the light, the master warning light in the instrument cluster comes on and the message appears on the multi-information display to remind the driver to fill fuel. The fuel system malfunctions in the following cases, so contact your Toyota dealer. D All the segments blink. D The "E" mark and the segments indicating remaining fuel blink. The indicator and warning lights indicate the coolant temperature when the ignition switch is on. The hybrid system operating temperature will vary with changes in weather and hybrid system load. The red high coolant temperature warning light will come on when the ignition key is turned to the "ON" position. After a few seconds, the light will go off. If your coolant temperature is cool with the ignition switch on, the blue low coolant temperature indicator light comes on. If it keeps lighting on with the hybrid system fully warmed, contact your Toyota dealer as soon as possible to service the vehicle. 89