How do you check error codes on 1994 Oldsmobile silhouette?

To check error codes on a 1994 Oldsmobile Silhouette, you can use an OBD-I scanner or a paperclip to bridge the diagnostic connector terminals. Locate the ALDL (Assembly Line Diagnostic Link) connector under the dashboard, then connect terminals A and B with the paperclip. Turn the ignition key to the "ON" position (without starting the engine), and the Check Engine light will blink, indicating the trouble codes. Count the blinks to determine the specific codes and refer to a service manual for their meanings.