However, there are a few things that *might* be necessary after installing a new ignition switch:
* The car might need to relearn the PATS (Passive Anti-Theft System) system. This is the system that prevents your car from starting unless the correct key is used. If the car doesn't start after the new ignition is installed, this is the most likely culprit. There are usually procedures to relearn the key with the car's computer. These procedures vary depending on the exact year and model. You might need a specific key programming tool, or you may need to perform a series of steps (like turning the ignition on and off repeatedly). Consult your owner's manual or a trusted mechanic for the correct procedure.
* Battery terminals might need to be cleaned and reconnected. Disconnecting and reconnecting the battery can sometimes help resolve minor electrical gremlins. Make sure the terminals are clean and tight.
* Check all connections. Ensure that all the wiring to the new ignition switch is securely connected. A loose wire can cause all sorts of problems.
* Possibly a scan tool diagnosis: If you're having other electrical issues after the replacement, such as a check engine light, a scan tool can help diagnose any trouble codes the car's computer might have recorded.
In short: There's no "computer reset" button. The most likely scenario is that you need to reprogram the PATS system. If that doesn't work, carefully check your connections and consider a professional diagnostic scan. Your owner's manual should be the first resource you consult. If it doesn't provide the information you need, a local mechanic experienced with General Motors vehicles will be able to assist you.
