1996 GMC Yukon Owner's Manual - Page 101

When the DRL are on, only your headlamps will be on. The taillamps, sidemarker and other lamps won't be on. Your instrument panel won't be lit up either. When it begins to get dark, your DRL indicator light is a reminder to turn your headlamp switch on. The other lamps that come on with your headlamps will also come on. When you turn the headlamp switch off, the regular lamps will go off, and your headlamps will change to the reduced brightness of DRL. Underhood Reel Lamp To idle your vehicle with the DRL off, set the parking brake. The DRL will stay off until you release the parking brake. As with any vehicle, you should turn on the regular headlamp system when you need it. If you have an underhood reel lamp, it is located inside the engine compartment on the rear passenger side of the engine compartment. You can use it as a flashlight. To use the lamp, pull up on the lever and pull the lamp out. The cordwill unreel as you pull the lamp. When you are done using the lamp, reel the cord back into the housing by turning the handle. Then, slide the lamp into the holder. Press PUSH on the lever to hook the lamp into the holder.