If the drivers door is opened with the ignition off and the lamps on, a warning chime will sound. This indicates that the headlamps are still on.
Wiper Activated Headlamps
Daytime Running Lamps (DRL)Chevrolet Cobalt Service & Repair Manual. Hood Support Strut, Replace
Warning: Body injury may occur
if no supporting rod is holding hood open when removing hood support strut.
Apply pressure only at end of
hood assist rod for removal or installation. Do not apply pressure to middle
of rod because damage or bending will result.
...