Is it the service reminder light that is on? It lights every 5000 miles on my Hybrid Camry to remind me to take it in for service. On my car it is a red triangularly shaped light with an exclamation point in it. If you would like to just reset it yourself, you can follow this link to another thread in this forum. Odometer must be set so that trip "a" is displayed.

http://www.greenhybrid.com/discuss/s...et+maint+light

I hope this helps,
Regards,
Doug