Here's the proper procedure:
1. Diagnose the problem: This is the most crucial step. You need to find out *why* the SES light is on. You have a few options:
* OBD-II Scanner: This is the best approach. An OBD-II scanner (available relatively inexpensively at auto parts stores) will read the diagnostic trouble codes (DTCs). These codes give you a specific indication of what the problem is. You can then look up the codes online or in a repair manual to understand what needs fixing.
* Professional Diagnostic: Take your Cadillac to a qualified mechanic or an auto parts store that offers free code reading. They can diagnose the problem and advise on the necessary repairs.
2. Repair the problem: Once you know the cause of the SES light, fix it. This could range from replacing a faulty sensor, fixing a leak, or addressing a more significant mechanical issue.
3. Clear the code (after repair): After you've repaired the problem, you can clear the code. 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 (-) terminal of your car battery for about 10-15 minutes. This often clears the code, but it's not guaranteed. Reconnect the battery.
Important Note: Simply disconnecting the battery or using a generic code clearing method won't solve the underlying problem. The SES light will come back on if the issue persists. Always address the root cause of the problem to prevent further damage to your vehicle.
