1998 GMC Sonoma Owner's Manual - Page 285

Also, for your audio system, see"Theft-Deterrent Feature" in the Index. Headlamps One-Piece Composite Headlamp System 1. Open the hood. Bulb Replacement Before you replace any bulbs, be sure that all the lamps are off and the engine isn't running. See "Replacement Bulbs" in the Index. For any bulb changing procedure not listed in this section, contactyour GM dealer's service department. Halogen Bulbs A CAUTION: Halogen bulbs have pressurized gas inside and can burst if you drop or scratch the bulb. You or others could be injured.Be sure to read and follow the instructions on the bulb package. 2. Remove the black retainer clips by lifting up. 3. Pull the headlamp assembly out. 4. Unplclg the electrical connector. 6-35