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I looked at the diagrams. The GEM module is hooked into a network which includes the engine computer, the abs module, and some other modules.
What specifically is hooked to the GEM module is;
The door ajar indication system.
The courtesy lights
All wiper controls
Rear wiper disable feature
Rear window and mirror defrost
Keyswitch warning system
Controls power to;
4wd transfer case controls
turnsignal switch
It also had the speed reference signal from the abs module, and a throttle position signal. I can only guess the speed reference may be used to automatically lock the doors at a certain speed? And they also may use that and the throttle position for a mileage computation?