1997 GMC Sonoma Owner's Manual - Page 225

The optional hub cap removal tool is stowed with the jack. Position the hub cap removal tool in the notch and pull straight away from the wheel to avoid potential damage to the hub cap and wheel surface. Remove the hub cap. If you have an aluminum or plastic molded hub cap, pry it off with the chisel end of your wheel wrench. Some of the molded plastic hub caps have imitation wheel nuts molded into them. The wheel wrench won't fit these imitation nuts, so don't try to remove them with the socket end of the wheel wrench. If you have individual wheel nut caps that cover each nut, they must be removed in order to get to the wheel nuts. Use the socket end of the wheel wrench to remove the wheel nut caps. Your wheel nut caps may attach your hub cap to the wheel. Remove these wheel nut caps before you take off the hub cap. 5-27