Cigarette Lighter not working

In most cases, the cigarette lighter for both the driver and passenger sides of a vehicle are connected to the same fuse. Therefore, it is likely that the same fuse controls both cigarette lighters in your 2005 Chevrolet Express 1500. To determine which fuse controls the cigarette lighters, you should refer to your vehicle's owner's manual, which will provide a diagram of the fuse box and indicate which fuse is associated with the cigarette lighter circuit. Once you have located the appropriate fuse, you can check to see if it is blown and replace it if necessary.

door locks and cig lighter ARE NOT on same circuit. Maybe lighter is broken and blowing fuse.

Maybe it's the cigarette lighter? Try it on another car and if won'r work, simply buy a new cigarette lighter.

If you'd like to take the time to look at all the fuses and see which one is blown, that's the 1 needing replaced. Normally a cigarette lighter fuse is a 10 amp ( Red ) fuse.

The lighter socket or the element.
Check the element for burn marks and the socket for debris blocking the contacts.

There are actually FIVE cigarette lighter/ Auxilliary Power Outlets shown in the wiring diagrams for your vehicle.
The Instrument Panel [1] Accessory Power Outlet (Cigarette Lighter) is protected by the "LTR" Fuse (# 53 - 20 Amp) in the Power Distribution Center (PDC) in the engine compartment.

The Instrument Panel [2] Accessory Power Outlet is protected by the "AUX PWR" Fuse (20 Amp) In the Instrument Panel Fuse Block on the left side of the dash.

The Center Seat Accessory Power Outlet and the (two) Center Console Power Outlets are protected by the "AUX PWR 2" Fuse (20 Amp) In the Instrument Panel Fuse Block on the left side of the dash. NOTE: If your vehicle is not equipped with the Center Seat Accessory Power Outlet, or the Custom Floor Console (optional), this fuse position will most likely be empty.

Do you mean that you are looking for the fuse? The fuse for the cigarette lighter is located in the fuse block under the left side of the dash. it is marked "CIG". It is a 15 Amp fuse

NOTE: This fuse also powers your clock, air bag sensor assembly, remote control mirror switch and your shift lock. If this fuse is blown, you will also have problems with these items.

Your vehicle is also equipped with an auxilliary power outlet (Which looks the same as the cigarette lighter socket) it is powered by the fuse marked "*1" If this fuse is blown, only the power outlet will not work. This also is a 15 Amp fuse. (See picture below)

most lighter screw in from the front and come out in 2 parts, it screws into the back part

Fuse box should be located either in the glove compartment, or to your left below stearing wheel. Also check fuses under hood, should be located next to the battery. Double check the GPS, most of them will nox plug into cigarette lighter plug. It could damage the GPS.

They probably share the same fuse. Sounds like cig lighter coil is shorted and "fiddling around" blew the fuse. Replace the fuse and try a different lighter coil.