89 eldorados security system wont alow car to start?

1. Check the battery: A weak or dead battery can prevent the security system from functioning properly. Make sure the battery has a good charge and the connections are clean and tight.
2. Try the valet key: If you have a valet key for your Eldorado, try using it to start the car. The valet key bypasses the security system, so if the car starts with the valet key, it confirms an issue with the security system itself.
3. Check the fuses: There may be a blown fuse related to the security system. Check the owner's manual for the location of the fuse box and inspect the fuses for any that are blown. Replace any blown fuses with fuses of the same amperage.
4. Reset the security system: Some Eldorados have a security system reset procedure. Refer to the owner's manual for specific instructions on how to reset the system. This may involve disconnecting the battery for a period of time or following a specific key sequence.
5. Check for faulty sensors: The security system may have faulty sensors that are preventing the car from starting. Common faulty sensors include the hood switch, door switches, or motion sensors. Check these sensors for any damage or misalignment and replace them if necessary.
6. Check the security system module: If the above steps don't resolve the issue, there may be a problem with the security system module itself. This module is responsible for controlling the security system and may need to be repaired or replaced.

If you're unable to resolve the security system issue, it's best to consult a qualified automotive technician or a Cadillac dealership for further assistance. They will have the necessary diagnostic tools and expertise to accurately diagnose and repair the problem.