my 1998 gmc suburban's automatic door locks just stopped working.

You would need a good voltmeter and wiring diagram to trace the wiring and fuses. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online I believe the instrument panel fuse box has a 20 amp fuse #13 (20 Amp) marked cig ltr that protects the circuit.