Where is the ignition module on a 1993 Cadillac ElDorado and what does it look like?

The 1993 Cadillac Eldorado's ignition module isn't a separate, easily identifiable box like in some older cars. Instead, the ignition control module is integrated into the Powertrain Control Module (PCM). The PCM is the car's main computer.

You won't find a component labeled "Ignition Module". Instead, you'll need to locate the PCM. This is usually under the dashboard on the passenger side, but its exact location can vary slightly depending on the options and trim level of your car. It's often attached to the firewall or tucked away in a hard-to-reach area. It's a relatively large, rectangular electronic control unit, usually black plastic. It will have numerous connectors and may have some identifying labels on it. Referencing your owner's manual or a repair manual specific to your year and model Eldorado will help pinpoint the exact location. You can also consult online forums dedicated to Cadillac Eldorados for assistance.

Because the ignition control is part of the larger PCM, replacing it is typically a more involved job requiring professional expertise or a significant understanding of automotive electronics.