Head and tail lights won't turn off when key is removed.

could be a faulty globe too

usualy there is a faulty earth to the bulb cluster remove them and clean all the conectors spray the harness and cluster with wd40 or similer put all bulbs back in and see if that works but i would go with a bad earth hope this helps ivan uk

Is this brake lights or tail lights? If brake, then switch on pedal is stuck, if tail lights, then switch is bad.

Almost all headlight bulbs have a bayonet mount with a rubber gasket. The bulbs have to be turned about 1/4 turn, usually counterclockwise, to remove them. If you have the new bulb, look closely at the mount on it. It will be helpful in knowing how the bulbs are installed. If the bulb has contacts that you push into the holder, the holder is what you need to get out. It will have the bayonet mount. Sometimes the bayonet is hard to turn if the gasket is stuck to the housing. However, don't use any solvent or lubricant because if it gets into the housing it can damage the mirror coating. Even moisture inside the housing can damage the coating, so be sure you install the new bulb correctly with the gasket in place. Be sure not to touch the new bulb with your bare fingers. The oil from your skin will burn on the bulb surface and shorten its life and light output. Never touch any halogen bulb with your bare fingers.

Thanks for using FixYa.
Gaker

Mr Pinske,

The rear running lights aren't on the same circuit as the headlight(s). To get the car legal for
night driving, replace the broken headlight (both need to work to drive legally at night),
and tackle the running lights as a separate project.
First thing to check on the running lights - the bulbs. Why: incandescent light bulbs that are
on at the time of an impact cannot withstand the impact and the filaments can fail, so fixing
your rear running lights may simply be a matter of replacing the two light bulbs.
If the bulbs are ok, your accident has caused a wiring fault, which you will locate
between the ignition switch and the rear running lights.
Here's the manual on how to replace the headlight:

1993 Buick Century
HEADLIGHT REMOVAL & INSTALLATION
Non-European Style
See Figures 1, 2, 3, 4 and 5

1. Remove the headlamp trim panel attaching screws.

Fig. 1: Remove the headlamp trim panel attaching screws

1. Remove the headlamp bulb retaining screws. Do not touch the two headlamp aiming screws, (at the top and side of the retaining ring), or the headlamp aim will have to be readjusted.

Fig. Fig. 2: Remove the headlamp trim panel assembly from it's mounting location

1. Using a screwdriver, remove the retaining ring screws.

Fig. 3: Using a screwdriver, remove the retaining ring screws

Fig. 4: Once the retaining ring screws are removed, the ring can be pulled away

1. Pull the bulb and ring forward then separate them. Unplug the electrical connector from the rear of the bulb.

Fig. Fig. 5: Pull the bulb out and unplug the electrical connector
To install:

1. Plug the new bulb into the electrical connector.
2. Install the bulb into the retaining ring and install the ring and bulb.
3. Install the trim panel.

Replacing the European style headlights is a slightly different procedure.

Hope this helps your out. I know the diagram and locator is a bit blurry but hopefully it gets what you need.
Drivers kick panel:
Front wiper 20A - Front wiper system Cigar 15A- Cigarette lighter Audio 10A- Audio, remote control mirror Air Bag 10A -Air bag diagnostics Stop lights- 15A -Rear brake light, high mounted stop light ECU B+ 10A - Shift lock actuator, transaxle controle module, radio, engine control module Room 10A - Interior light, clock, ignition key reminder, rear cargo area light switch ABS 10A- Anti lock brake system control unit ECU IG1 10A - Transaxle control module, shift lock actuator, ABS control unit, DRL unit Meter 10A - Instrument panel, back-up switch, electronics time control module, inhibit switch Turn signal 10A- Hazard switch ,front and rear turn lights, turn indicator IGN1 20A - Ignition switch ABS 30A- ABS pump motor TNS 30A- Tail light, license plate light COOL/FAN 30A- Cooling fan Cond/Fan 20A- A/C condenser fan Starter 15A- Start signal , Fuel pump Blower 25A- Blower Motor SR/ACC 10A - Ignition switch Hazard 15A - Hazard and turn signal light D/Lock 25A- Door locks ABS 30A - Anti lock brake system control P/W RH 20A- Power window motor right hand P/W LH 20A- Power window motor left hand IGN2 25A- Ignition Switch
Engine compartment :
Head 25A- headlights IG 2 30A- Ignition switch IG coil 15A -Ignition coil, condenser,generator IC regulator, diagnostic connector. O2 down 10A- Rear O2 sensor O2 up 10A- Front O2 sensor Fuel pump 10A -Fuel pump unit Injector 10A -Fuel injector ,camshaft positioning sensor, purge solenoid valve, EVAP, IAC actuator, Mass Airflow sensor, EGR stepper motor. fuel pump relay coil, vehicle speed sensor. A/Con 10A - A/C compressor controls, cooling fan BTN 30A- Brake light , high mounted stop light. Tail light LH 10A- License plate light, tail light , rear combo light, instrument panel illumination Tail light RH 10A-License plate light, tail light , rear combo light, instrument panel illumination Head low 15A- Headlight Head Hi 15A-Headlight Horn 15A- Horn

Inside kick panel

Cylinder Head Removal & Installation 3.1L Engine To Remove:
NOTE: With some minor variations, this procedure can be used on both the left and right cylinder heads.

1. Raise and safely support the vehicle.
2. Drain the engine coolant and the engine oil. Lower the vehicle.
3. Remove the upper and lower intake manifolds.
4. Remove the rocker arms and pushrods.
5. Remove the exhaust crossover pipe.
6. Remove the engine mount strut bracket.
7. If removing the left side (front) head, remove the dipstick tube.
8. Tag for identification, then remove the spark plug wires.
9. Remove the spark plugs.
10. Remove the exhaust manifold using the procedures found in this section.
11. Remove the eight cylinder head bolts, then remove the cylinder head. There are locator pins that align the head to the block. Pull upwards on the head to disengage the pins, then remove the cylinder head to a suitable work area.
12. If the head is be overhauled, remove any remaining components such as the engine lift hook, the fuel line bracket bolts, the engine coolant temperature sensor, etc., as required.

Position a new gasket, install the head, then tighten the bolts in the sequence shown (3.1L engine shown)

To Install:
NOTE: If the head gasket failed, determine the cause. Gasket failure is caused by the following conditions: improper installation; overheating due to a failure in the electric cooling fan system or a leak in the cooling system; loose or warped cylinder head; missing, off location or not fully seated locator dowel pins; low torque on the cylinder head bolts; warped block surface; scratched or gouged gasket surfaces; excessive intake manifold torque and even cracked engine block tapped holes.

1. Clean all parts well. Remove all foreign material to the bare metal. Do not use a motorized wire brush on any gasket sealing surface. It is good practice to use the proper size thread-cutting tap to clean the threaded bolt holes in the block. This helps assure an accurate torque reading.
2. Place a new head gasket on the clean engine block deck surface. Many gaskets will have some sort of marking denoting TOP or THIS SIDE UP. Make sure the gasket sits flat and is not hung up on the locator dowel pins. Use no sealer on the head gasket.
3. Carefully set the cylinder head in place, using care not to damage the gasket. Make certain that the head engages the locator dowel pins that properly position the head.
4. The bolts should be very clean since dirt built-up on the bolt threads makes it difficult to get an accurate torque reading. These are 'torque to yield' bolts which stretch a small amount when tightened; new bolts are always recommended. On a used vehicle, especially a high-mileage vehicle, it may be difficult to determine if the heads have been removed before and how many cycles the bolts have been removed and tightened. New bolts should be part of any cylinder head service. Use GM Sealer #1052080, or equivalent, on the threads of the head bolts and install all eight bolts, finger-tight.
5. With an accurate torque wrench, tighten the bolts gradually, in sequence, working from the center outwards. Final torque should be 33 ft. lbs. (45 Nm), plus an additional 90 degrees (1/4-turn). A torque angle meter is recommended.
6. Install the remaining components in the reverse order of the removal process.

Rear. 2 retainers PLUS a very tight ball socket holding the light assembly into place. Be ready to catch the tail light when you pop it of the ball socket.
Front. Use the headlight removal tool in the tool kit. Open front bonnet and push down and remove tear shape trim on headlight side in question. Place headlight tool onto spline and with one hand ready to "catch" the headlight, turn the tool until headlight pushes forward. Then remove headlight by hand and replace globe as required. Be careful of bayonet fitting. Can be fragile.

and Repair Notes TAIL LAMP REPLACEMENT REMOVAL PROCEDURE Open the rear compartment. Remove wingnut and pull back the rear compartment trim panel from the tail lamp. Remove the wingnuts from the tail lamp. Remove the tail lamp from the rear body panel. Disconnect the electrical connector from the tail lamp. Remove the tail lamp socket, turning counterclockwise. Remove the bulb from the tail lamp socket. Remove the sidemarker lamp socket, turning counterclockwise. Remove the bulb from the sidemarker lamp socket. INSTALLATION PROCEDURE Install the bulb to the tail lamp socket. Install the bulb to the sidemarker lamp socket. Install the sidemarker lamp socket, turning clockwise. Install the tail lamp socket, turning clockwise. Connect the electrical connector to the tail lamp. Install the tail lamp to the rear body panel. Install the wingnuts to the tail lamp. Pull back the rear compartment trim panel to the tail lamp and install the wingnut. Close the rear compartment.

If you already check the dimmer definetly you will have to remove the dashboard area where the indicator is and replace those light bulbs they are tiny so careful and first check your auto parts store for correct number.luck!