1999 Astro. Cigarette lighter & Power Locks have gone dead

Hello. All of my power locks on my 99 Astro as well as the cigarette lighter have gone dead. My first thought was that maybe I had blown some fuses so I checked both boxes (internal and under the hood) but could find no identification printed on the protective covers that say either PWR LOC or LIGHTER as I hoped to find. With the lighter my problems began when I began using a mobile charger for my cell. About two weeks later I lost my power locks. Can anyone point me in the right direction on this? Thanks very much.