Tech, how can I reset the service light on my XC90 I took it to jiffy lube instead of the dealer and they don't know how to reset it.

http://www.volvoforums.com/m_6044/mpage_1/key_Service%252Clight%252Creset/tm.htm#6044

Follow the instructions from the link and let me know if you have trouble.

I believe there are also special tools for purchase such as this:
http://cgi.ebay.com/ebaymotors/VOLVO-RESET-SERVICE-LIGHT-DO-IT-YOURSELF-XC70-XC90_W0QQcmdZViewItemQQcategoryZ6762QQitemZ8005180 930QQrdZ1QQsspagenameZWDVW
http://www.onboarddiagnostics.co.uk/volfcr

They can reset the service light and cover others as well:
# Engine. Petrol and Diesel
# ABS brakes
# Automatic transmission
# SRS - Airbag and other protection systems
# Driver and Passenger seat memories
# Instruments. including service light reset
# Climate Control - Air conditioning
# Immobilizer
# Alarm
# Road Traffic Information
# Additional Heater

Check compatability with your model first.