How do you reset computer in 1994 Chevy 2500 pick up truck?

A 1994 Chevy 2500 pickup truck doesn't have a "computer reset" in the same way a modern car does. There's no single button or procedure to erase all learned parameters. What you might be trying to do depends on the specific problem you're facing. Here are a few possibilities and how to address them:

* If you're experiencing a check engine light (CEL): The CEL indicates a fault code stored in the Powertrain Control Module (PCM). You *can't* simply reset this like a modern car. You need to:

* Diagnose the problem: Use an OBD-I scanner (specific to the 1994 model year) to retrieve the diagnostic trouble codes (DTCs). Auto parts stores often have scanners, or you can buy one.

* Fix the underlying issue: The CEL won't go away until the problem causing it is fixed. Ignoring it could lead to further damage.

* If you're having intermittent electrical problems: Disconnecting the battery's negative terminal for about 30 minutes can sometimes help. This allows the computer's memory to clear. Reconnect the negative terminal afterwards. Note: This won't clear fault codes related to the engine's performance; it only resets some learned parameters like power window settings.

* If you've replaced a sensor or component: Sometimes, after replacing a part, the PCM needs time to relearn the new component's parameters. Driving the truck normally for a period (often several driving cycles) allows this to happen.

In short: There's no "reset" button. Focus on diagnosing the specific issue you're having instead of trying to blindly reset a system that doesn't work that way. Using an OBD-I scanner is crucial for addressing check engine lights.