The only thing in common between the parking and interior lights is that the switches for each are located on the Main Light Switch. The parking lights will come on if the switch is pulled out to either the first or second stop. (The second stop also being the headlamps ON position). The interior lamps are turned on when the Main Light Switch is turned fully counter-clockwise. It is possible that the switch is defective but it seems unlikely that a defective switch could cause both of these problems. The interior lights are also controlled by the Interior Lamp Delay Timerwhich is controlled by the Door Jamb Switches. These timer modules are prone to failure and can cause the interior lights to remain on at all times. Un-plugging the module is the best way to find out if it is defective or not. It is located on the Instrument Panel Wiring Harness which is accessable by removing the lower instrument panel just above the passenger's knees (the panel with the light) and reaching up with one hand to find the harness. It is a small black plastic box taped to the harness. Break the tape with your fingers and you can lower the box down just enough to unplug it. It will have a 5-pin connector with (1) black, (3) white, (1) pink/black & (1) pink/white wire. If you find the timer module to be the problem, you can connect all three of the white wires together and you will have working interior lights when you open the doors. However, the lights will shut off immediately when you close the doors but you will have lights and they won't be on at all times.
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If the interior and parking lights are not working on a 1999 Nissan Pathfinder, the first fuses to check would be the interior light fuse. Also check to make sure the light switch is in the right position to allow the interior lights to come on.
Interior lights often stay on after the door is closed because of a faulty relay. There could also be a broken wire or a short circuit.
First guess would be a bad switch.
change the head light swicth
if you leave the parking lights switch "ON" the lights will remain on, even if the car has been turned off.
Blown fuse? Damaged buss board?
Check your fuses - they are operated separately
The year, make and model would help.
I am not a mechanic, however as an electrician it sounds like the running board lights are wired to the same relay as the interior lights. To check this, simply crank the truck, leave all the exterior lights off, turn on the interior light, then walk around the truck and look at the running board lights. If they are on then turn the interior light off and the parking lights on, check to see if the running board lights come back on. Depending on the make and model of the truck, I could be way off in left field and this info may not apply. uuummmm.....programing?
Proper Use of "Parking Lights"The answer depends on the "Traffic Code" for the State in which you are driving.However, they are called parking lights because they are supposed to be used to warn other vehicle drivers of the location, position, and "state" [parked] of your vehicle.Most jurisdictions prohibit driving with parking lights only. The only exception that might convince a Police Officer to not give you a ticket would be in the case of the loss of headlights out in the boondocks on a very dark night in which you drove only with parking lights to get to a safe place.
because the lighting module is bad