Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Cadillac CTS AutomaticFACTORY OEM SERVICE PROCEDURE
Navigation System
- Turn the system on by pressing the PWR/VOL knob once. The PWR/VOL knob is located to the lower left of the Driver Information Center (DIC) display.
- Press the INFO button located to the left of the display to access the Vehicle Information menu.
- Turn the TUNE/SEL knob located to the lower right of the display until Engine Oil Life is highlighted. Press the knob once to select it.
- Once the 100 percent Engine Oil Life is displayed, press the multi-function button next to the Reset prompt in the upper right corner of the display.
- The percentage will return to 100 and the oil life indicator will be reset.
- Repeat the steps if the percentage does not return to 100.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.