2005 Toyota Prius Owners Manual - Page 135
2005 Toyota Prius Manual
Page 135 highlights
If the indicator comes on... Do this. Stop and check. (a) (b) Stop and check. (c) Stop and check. (d) Take vehicle to Toyota dealer. (e) Take vehicle to Toyota dealer immediately. (f) Take vehicle to Toyota dealer. (g) Take vehicle to Toyota dealer. 125