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you will have to remove the dash bord
Take your car to a Chevy Dealer
just unplug it but do not have the car on. Also you will have to get it programed.
this link will give u your answer http://www.ford-trucks.com/forums/647209-4x4-control-module-4x4-flash-problem-3.html
The 4x4 control module is located behind the kick panel in the passenger side floor board. The module simply unplugs and you plug the new one in.
From easiest to worst--fuses,bulbs,relays,switch,body control module,wiring.
replace the switch
The 2002 Acura airbag control module is located on the firewall in the engine compartment. The airbag control module will be on the drivers side of the firewall.
Replace the fuse and the relay called the CCRM (Constant Control Relay Module).
Powertrain Control Module
The airbag control module in a 2002 Saturn SC2Êis located underneath the center console. It is the yellow connector behind the shifter.
"How do you replace the fan control switch on a 2002 Grand Prix?"