1999 GMC Sonoma Owner's Manual - Page 302

yellowblue Fuse/Circuit Breaker 13 14 15 16 17 18 19 20 21 22 23 24 Usage Auxiliary Power Power Locks 4WD Switch, Engine Control (VCM, PCM, Transmission) Supplemental Inflatable Restraint Front Wiper Not Used Radio Battery Not Used HVAC I, HVAC Control Head, HVAC Devices Anti-Lock Brakes Rear Wiper Radio, Ignition The fuse block is under the hood on the driver's side of the engine compartment. Remove the cover by turning the fastener counterclockwise. To reinstall the fuse panel cover, push in and turn the fastener clockwise. Engine Compartment Fuse Block 6-64