* Powertrain Control Module (PCM) or Engine Control Module (ECM): This is the primary computer, managing the engine's fuel injection, ignition timing, and other functions. It's often the one that needs attention if you're experiencing drivability problems.
* Body Control Module (BCM): This manages various body functions like lighting, power windows, locks, and sometimes even the climate control system.
There isn't a single replacement part called a "computer" for this car. If you're having problems, you'll need to diagnose the specific issue (e.g., engine trouble, electrical problem) and then replace or repair the affected *module*. You'll likely need to visit a mechanic or a specialist in older Buicks to get this diagnosed properly, or use an OBD1 diagnostic tool (if you can find one that works with your car's system). Parts are likely to be hard to find and may require searching for used units or rebuilders specializing in classic car parts.
