interior lights not working (dome light, foot well)
#1
Driver School Candidate
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Don't know why my interior lights in the front stop working when I open the front doors. The dome lights work fine when I switch them to the "on"position. But when I switch them to the "door" position it doesn't work. All the fuses looks good. Bulbs are all good. When I open the front doors the car recognizes them when they are open. The lights on the doors turns on but not the dome lights.
Does anyone know where I should start to fix this problem?
Does anyone know where I should start to fix this problem?
The following users liked this post:
Tun (12-31-19)
#2
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
You have sinned 808 times my son. Repent, and your dome lights will again work. ;-)
Well, seems to me that it might be in the switch that takes you from 'on' to 'door' mode. At least that is where I would start. That switch routes the supply to the dome light either directly from 12v ('on') or switched from the door being open('door'). Might be a bad switch...maybe. What year/make do you have?
Well, seems to me that it might be in the switch that takes you from 'on' to 'door' mode. At least that is where I would start. That switch routes the supply to the dome light either directly from 12v ('on') or switched from the door being open('door'). Might be a bad switch...maybe. What year/make do you have?
#5
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Do you remember how your dome lights would behave as they came on? Did they come up slowly and then dim back down as they went off? I believe that the domes are controlled thru a dimmer circuit and the door lights just come on full bright w/o dimming. So, it is possible that the dimmer driver is not working. I really doubt that it is related to hitting a bump but stranger things have happened. I will look and see if I can find any sort of schematic.
Last edited by randal; 08-31-14 at 05:51 AM.
#6
Driver School Candidate
Thread Starter
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I really don't remember. I got all led bulbs. I noticed that the led bulbs would glow everytime I press the gas when the switch is in the "door" position. Ohh one thing I remember is that the bulbs in the footwell would stay on and would not turn off. So I had to remove the bulb. Hope it helps
#7
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
whoa...wait a minute! You replaced some of the cabin bulbs with LEDs? That might explain your issues because LED's take quite a lot less current than the original incandescent bulb and the dimmer drive circuitry may not 'play' nice with them. In addition, they are 'directional', meaning they only light with a certain polarity...and you may have that reversed. That LED bit of info is very important. I would now suggest that you replace the LED bulbs with the original style bulb, then see what happens.
Last edited by randal; 08-31-14 at 12:00 PM.
Trending Topics
#8
Moderator
![](https://www.clublexus.com/forums/images/ranks/rank-mod2.gif)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Don't know why my interior lights in the front stop working when I open the front doors. The dome lights work fine when I switch them to the "on"position. But when I switch them to the "door" position it doesn't work. All the fuses looks good. Bulbs are all good. When I open the front doors the car recognizes them when they are open. The lights on the doors turns on but not the dome lights.
Does anyone know where I should start to fix this problem?
Does anyone know where I should start to fix this problem?
Unfortunately it can't be fixed just replacing a fuse or something similar. You need to replace the whole unit to fix. I have seen many people killing it trying to replace bulbs to LED ones.
#9
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Yamae, do you happen to know the failure mode of the Multiplexer computer? Does the LED knock out some drive transistor? And finally, are there any schematics of the MPX? I would love to take a look at it.
808sinned, I would still put the incandescent bulbs back in and see what happens. If you have lived a clean life, the MPX will still be ok. Oh wait...you have sinned. Forgot.;-)
808sinned, I would still put the incandescent bulbs back in and see what happens. If you have lived a clean life, the MPX will still be ok. Oh wait...you have sinned. Forgot.;-)
#10
Moderator
![](https://www.clublexus.com/forums/images/ranks/rank-mod2.gif)
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
Yamae, do you happen to know the failure mode of the Multiplexer computer? Does the LED knock out some drive transistor? And finally, are there any schematics of the MPX? I would love to take a look at it.
808sinned, I would still put the incandescent bulbs back in and see what happens. If you have lived a clean life, the MPX will still be ok. Oh wait...you have sinned. Forgot.;-)
808sinned, I would still put the incandescent bulbs back in and see what happens. If you have lived a clean life, the MPX will still be ok. Oh wait...you have sinned. Forgot.;-)
Regarding the schematics, any of them are not available. I only have wiring diagrams in the service manual. I always need to analyze the board by my eyes, a circuit tester, an oscilloscope and some lighting tools.
#14
Driver School Candidate
Thread
Thread Starter
Forum
Replies
Last Post
oleSLICK
LS - 1st and 2nd Gen (1990-2000)
2
04-13-17 10:16 AM
CaThaFeR
IS - 2nd Gen (2006-2013)
27
03-18-06 04:38 PM