Here's the proper procedure:
1. Diagnose the problem: The first and most crucial step is to find out *why* the SES light is on. You can do this in a couple of ways:
* OBD-II Scanner: This is the most reliable method. An OBD-II scanner (available at most auto parts stores) plugs into your car's OBD-II port (usually under the dashboard) and reads diagnostic trouble codes (DTCs). These codes pinpoint the specific problem. Many inexpensive scanners are available, and some smartphone apps can function as scanners with a compatible adapter.
* Professional Mechanic: If you're uncomfortable using a scanner, take your Cadillac to a qualified mechanic. They have the tools and expertise to diagnose the problem accurately.
2. Repair the problem: Once you know the DTCs, you can fix the problem. This might involve replacing a sensor, fixing a leak, or performing other necessary repairs. This is crucial. Simply resetting the light without addressing the underlying issue could lead to more serious damage.
3. Clear the code (reset the light): After repairing the problem, you can clear the DTCs and reset the SES light. There are several ways to do this:
* OBD-II Scanner: Most OBD-II scanners have a function to clear codes. Follow the instructions for your specific scanner.
* Disconnect the Battery: This is a less precise method. Disconnect the negative (-) battery terminal for about 10-15 minutes. This will reset the computer, but it may not clear all codes, especially if the problem is a serious one. Reconnect the battery and start the car. The light may take a few driving cycles to turn off. *Note:* This method might also clear other settings in the car's computer, like radio presets.
Important Considerations:
* Don't ignore the SES light: Driving with a malfunctioning system can lead to further damage or unsafe driving conditions.
* Proper repairs are essential: A quick fix might seem cheaper, but neglecting the root cause can have more costly consequences down the road.
In short, resetting the light is the final step, not the first. Focus on diagnosing and fixing the problem that triggered the light in the first place. Ignoring the problem will only lead to more trouble and expense.
