Here's what you need to do:
1. Find the Problem: The SES light doesn't tell you *what* is wrong. You need to get the trouble codes read. This is done differently than with OBD II vehicles. You'll need one of the following:
* A code reader specifically designed for OBD I systems (pre-1996): These are less common now than OBD II readers, but you might find them online or at some auto parts stores. They usually plug into the car's diagnostic connector (location varies by car, consult your owner's manual).
* A mechanic with experience in OBD I systems: A qualified mechanic will have the tools and knowledge to read the codes and diagnose the problem. This is the recommended approach.
* The "jumper wire" method (risky and not recommended): This involves shorting specific pins in the diagnostic connector. However, this method is error-prone and can be difficult to perform correctly without the proper knowledge and potentially damaging your car's computer. Unless you're very familiar with this process (and know the specific pin locations for your model), avoid this method.
2. Fix the Problem: Once you know the trouble code(s), you can identify the likely cause and repair it. This might involve replacing a sensor, fixing a wiring issue, or addressing a more significant mechanical problem.
3. Clear the Code (after repair): *Only after you've repaired the underlying issue* should you attempt to clear the code. On many OBD I vehicles, this is done by disconnecting the battery's negative terminal for a few minutes. This will reset the car's computer. However, some cars might require different methods; a mechanic can usually clear the codes.
In short: Don't focus on resetting the light. Focus on *fixing the problem causing the light to illuminate*. A qualified mechanic is your best bet for diagnosing and repairing the issue, especially with an older car like a 1990 Toronado. Ignoring the problem could lead to expensive repairs later.
