Interior light switch where is it? - 2001 Mercury Sable

there must be a switch on the actual light fitting to set it to 1 always on , 2 always off , 3 on when door opens , check the switch position

If your interior lights are not turning off, you probably have the override switch turned on. This is located in front headliner area and has a light icon on it. This switch forces the interior lights on, even when all of your doors are shut, or if you are driving.

It can be one of two problems. One: pending on what kind of car you have. ..there is a switch near the steering column that turns left or right...adjusting your dash lights and or turning on/you interior lights.#2...check the interior fuse bus panel/box

Have you check the switch on the interior? should be dome lights switch or instrument light switch. it may have accidently turned off good luck

1. If you have the light switch in the wrong mode the lights will not operate when you open the door.

2. If the interior lights do not operate at all (ie you cannot switch them on and off manually)then you need to check the fuse for the interior lights.

3. When set to the correct mode, the interior lights will operate from a door operated switch so if the switch has failed the lights will either stay on or not operate at all when you open and close the door. Eventually these door switches fail with repeated use and need to be replaced. (Consider how many times the small door switch has been operated since 1996).

Brake light switch is located at the brake pedal, disconect switch & bridge wires at plug, if brake lights on switch is faulty, You probably have a fuse for interior illumination.

either the lights are turned on manually from the headlight/interior light switch, or you have a defective door switch that is telling the module that a door is open, or you have a door that is open, or your module that controls the interior lights is defective. I would start with the simple things, I would make sure all doors are closed. If they are, then check the headlight/interior switch to make sure the interior lights are in the off position, then check all of the door switches. They are simple normally closed push button switches that should be mounted on the car frame near the door hinges.

check all fuses,interior bulbs an connections,you mite have a problem with interior light switch or dimmer switch to brighten lights on dash & interior or the turn signal switch assembly

there is a timer on the interior lights to turn off after 20 minutes.
one of your door switches are bad,and it tells the computer that a door is open and the lights are turned off,that makes sense.
a way to test this is to undo the battery for a minute. then see if the interior lights come on. one of the door switches is bad

The switch is finding its ground thru the interior light switch. Your problem is most likely a broken wire in side the rubber boot that goes from the door to the body near the door hindges.