Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1998ENVOY 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULEDESCRIPTION AND OPERATIONBODY CONTROL SYSTEM CIRCUIT DESCRIPTIONREMOTE FUNCTION ACTUATOR (RFA)
1998 GMC Envoy 2WD V6-4.3L VIN W
Remote Function Actuator (Rfa)
1998 GMC Envoy 2WD V6-4.3L VIN WSECTION Remote Function Actuator (Rfa)
The RFA module is part of the remote keyless entry system. The RFA module sends a serial data message to the Body Control Module (BCM) through a dedicated serial data line. The RFA module is not on the Class 2 serial data network.
The following commands are sent to the RFA module by the RFA transmitter (Key Fob):
^ The door lock and unlock control
^ The lift glass release
^ The panic alarm
The RFA module then sends a serial data message to the BCM in order to perform the appropriate function. Refer to Transmitter Programming for programming of the RFA system.
The following commands are sent to the RFA module by the RFA transmitter (Key Fob):
^ The door lock and unlock control
^ The lift glass release
^ The panic alarm
The RFA module then sends a serial data message to the BCM in order to perform the appropriate function. Refer to Transmitter Programming for programming of the RFA system.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.