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Unless you have AU0 on the SPID sticker in the glovebox, you don't have keyless, only power locks.
Here's how to add it:
www.s10forum.com
Here's how to add it:

Adding keyless entry to 2002 blazer?
well my 2002 blazer has power windows and locks but never had keyless entry. I've heard it should have a connector under the drivers kick panel to "plug and play" a receiver module. So the only 2 things i need to get from a junkyard is the module that is supposedly bolted to the underside of...