I will attach the info from the manual below. However, I suspect you want to replace the switch because it is damaged or even you have the key stuck in it.
This was a common issue on these older GM products so here is a guide that will help with this:
https://www.2carpros.com/articles/ignition-switch-wont-turn-stuck
After running through the guide, the info from the manual is above.
Please let me know if you have other questions or need more info.
Thanks
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Thursday, January 27th, 2022 AT 5:18 PM