The book say's to turn ignition on, there is no ignition switch?
How to reset engine oil life on 2010 Cadillac SRX
Try this method: 1) Using the Driver Info Center (DIC) MENU button and thumbwheel on the turn signal lever, display OIL LIFE REMAINING on the DIC. 2) press the SET button to reset the oil life to 100%. If you're in the Sacramento area, you can stop by anytime and we'll help you reset it.
press the clear(clr) button between the up and down arrows for 5 seconds when the display is on oil life %