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Old 11-05-2008, 01:40 PM   #1
Abnormal
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Default Dome Light Under Dash?

Looking to install under dash puddle lights, but I can't find the wire that controls the dimming of the dome light under the dash!

This wire, when I unlock my 06 WRX, will "roll on" aka gradually increase output until completely lit, then do the reverse once the key is in/car is locked/etc.

Seems very easy, IF I could just find the wire!!!

Any hints appreciated
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Old 11-06-2008, 08:48 AM   #2
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Have you tried looking at a wiring diagram to see which components this wire connects to other than the dome light? That would help you find the wire. It would even give you the color.
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Old 11-07-2008, 01:26 PM   #3
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I have been searching, and can't find said wiring diagram. I did find something I might be able to use on the12volt though I would still appreciate some know it all's help
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Old 11-09-2008, 12:27 PM   #4
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I'm looking for this exact same wire! My big problem is that my dome light does not come on when the doors open. So it would be nice to have some other light. I'll post if I find anything.
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Old 11-09-2008, 01:20 PM   #5
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Quote:
Originally Posted by a13n0rma1 View Post
I have been searching, and can't find said wiring diagram. I did find something I might be able to use on the12volt though I would still appreciate some know it all's help
Help is here.

There may be a problem trying to add more lights to the controlled dimmer circuit. The circuit has to be able to handle the current load of the light and by adding extra load to the present system it may overload it and cause damage to it. You could safely add new lights that are tied directly to power and use the switched ground of the door switch to turn on the new lights.

Power to the interior lights comes from fuse #2 in the main panel under the hood. A blu/red wire ties from there, through the dash fuse panel and to the interior lights. The driver side door uses a blu/orn wire from the switch in the door to control the ground connection. The other doors use a yellow wire from their switches. Those wires tie to the Integrated Module. You could at least tie into the driver's side wire to activate the lights.

The driver side door wire is seperated from the rest of the doors for some reason. If you wanted to have all the doors work the light then some diode isolation may be needed to keep the driver side switch isolated from the rest.
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Old 11-09-2008, 01:23 PM   #6
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Quote:
Originally Posted by 20BlueWRX02 View Post
I'm looking for this exact same wire! My big problem is that my dome light does not come on when the doors open. So it would be nice to have some other light. I'll post if I find anything.
Have you checked to see if power is getting to the dome light and also the position of the switch that controls the dome light?
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Old 11-09-2008, 01:37 PM   #7
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Quote:
Originally Posted by Cougar4 View Post
Have you checked to see if power is getting to the dome light and also the position of the switch that controls the dome light?
I have checked with a multimeter and there is constant power at the dome light. It works when the switch is in the "ON" position, but in the center position it never turns on and doesn't see 12V regardless of doors being opened.

Other things to note, are the "doors open" (for lack of a better term) light does come on and off on the instrument cluster when the doors are open. This leads me to believe it is not a door switch. And also, 75% of the time when locking my car I get 3 horn beeps even though all doors are closed. What's even more strange is that 15 minutes later when I'm in the house I will hear that 4th beep. (even though I haven't touched the car) For this reason I must have valet mode on or else my alarm will go off at random when it somehow thinks a door is being opened.

**Sorry to hijack, I should really start a new thread!
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Old 11-09-2008, 01:45 PM   #8
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Quote:
Originally Posted by Cougar4 View Post
Help is here.

There may be a problem trying to add more lights to the controlled dimmer circuit. The circuit has to be able to handle the current load of the light and by adding extra load to the present system it may overload it and cause damage to it. You could safely add new lights that are tied directly to power and use the switched ground of the door switch to turn on the new lights.

Power to the interior lights comes from fuse #2 in the main panel under the hood. A blu/red wire ties from there, through the dash fuse panel and to the interior lights. The driver side door uses a blu/orn wire from the switch in the door to control the ground connection. The other doors use a yellow wire from their switches. Those wires tie to the Integrated Module. You could at least tie into the driver's side wire to activate the lights.

The driver side door wire is seperated from the rest of the doors for some reason. If you wanted to have all the doors work the light then some diode isolation may be needed to keep the driver side switch isolated from the rest.
So let me get this right, the doors use a switched ground connection? Meaning that if we gave whatever lights we want to hook up constant power, and tapped the ground lead into the driver's side door switch, we should get the result we are looking for? That is, the lights would turn on when we opened the driver's side door and completed the ground side of the circuit.
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Old 11-09-2008, 01:55 PM   #9
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You are correct. That is the way the light circuits work. The door switch makes the ground connection.

The dome light should have 3 positions. The third position would be for the door switching.

Edit:
You are also correct about the door switch being ok since the warning light is working.

The alarm system does appear to be in the valet mode. As far as the fourth horn sound 15 minutes later I can only guess that it is a warning or alert signal of some sort. It may also mean there is a fault with the alarm system.

Last edited by Cougar4; 11-09-2008 at 02:03 PM.
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Old 11-09-2008, 01:58 PM   #10
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Sweet!

I've replaced the dome light with an LED bulb, and will only be adding a trivial amount of LEDs to the circuit... Roughly 12 all in all, so I should still clear well under the original 3W halogen lamp

Cougar4, you fiving rock.
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Old 11-09-2008, 02:08 PM   #11
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Quote:
Originally Posted by a13n0rma1 View Post
Sweet!

I've replaced the dome light with an LED bulb, and will only be adding a trivial amount of LEDs to the circuit... Roughly 12 all in all, so I should still clear well under the original 3W halogen lamp

Cougar4, you fiving rock.
OK! Very good idea. Use LEDs to reduce the load. Just as a reminder, the instructions I posted in post 5 do not hook up to the dimmer circuit. They tie directly to power and switched ground. While looking at some data on the lights I didn't see anything showing the dimmer circuit for them. By using LEDs you may just want to tie directly to power anyways. The dimming action won't work quite the same way as normal bulbs do.

Last edited by Cougar4; 11-09-2008 at 02:20 PM.
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Old 11-09-2008, 09:27 PM   #12
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Quote:
Originally Posted by Cougar4 View Post
OK! Very good idea. Use LEDs to reduce the load. Just as a reminder, the instructions I posted in post 5 do not hook up to the dimmer circuit. They tie directly to power and switched ground. While looking at some data on the lights I didn't see anything showing the dimmer circuit for them. By using LEDs you may just want to tie directly to power anyways. The dimming action won't work quite the same way as normal bulbs do.
Gotcha. I think I'll just have to hope the wire color from the headliner follows all the way under the dash somewhere. I already know the harness goes down the passenger side A pillar, so at least I have somewhere to go from there.

Dimming won't be exactly the same, but with the LED dome light already in place I can tell it will be cool!
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Old 06-01-2009, 01:00 AM   #13
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a13n0rma1, did you find wires you were looking for under the dash? I'm about to do a similar mod, but puddle lights outside the car, under the side skirt. I tried tracing the blue/red wire through the passenger A-pillar... but the blue/red wire on the driver side isn't the same one (I unplugged the connector it was connected to and the dome lights still worked).
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Old 06-01-2009, 12:17 PM   #14
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I did not.

was going to tackle it this weekend, but car's totalled

-A13n0rma1 Advocate against n00bs in SUVs thinking "I can make it" when pulling out of side streets
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Old 06-01-2009, 02:03 PM   #15
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Can anyone else help me find the right wires? I do have the service manual, but not sure how to "trace" the wires with the information provided.

oh and... that suucks about the SUV. sorry to hear man... any injuries?
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Old 06-01-2009, 06:03 PM   #16
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Possible long lasting injuries

BUT! With the wiring manual you should be able to trace wire color or at least follow a "central location" for the wire to go to.

If you were not on an opposite coast and nearby I'd say swing by and we can trace until we find it or we're blue in the face but instead you can scan the pages and email them to me if you want (or post them here!)
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Old 06-01-2009, 07:27 PM   #17
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very easy in the 2008s just trace the power wire from the dimmer
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Old 06-03-2009, 01:28 AM   #18
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Okay, here is the wiring diagram from the service manual:

edit: woops, wrong diagrams.

Last edited by simonbsays; 06-13-2009 at 02:14 PM.
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Old 06-03-2009, 01:35 AM   #19
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So... am I looking at the right level of data? Any tips on methods of "tracing" would be greatly appreciated

Thanks in advance!
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Old 06-05-2009, 04:24 AM   #20
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You are close to the correct page showing the dome light but it isn't on the pages you provided. The page may be titled compartment lighting.
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Old 06-10-2009, 01:48 AM   #21
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Ahh here it is (wiring diagram of interior light system):

So i'm looking for the Blue/Red (LR) wire that's at FB-8 M/B Fuse No. 2?

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Old 06-11-2009, 06:53 PM   #22
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The blue/red (LR) wire coming from fuse #2 will supply 12 volts to the lights but won't make them dim. I think it is the Body Integrated Module that the return side of the room light runs through is what makes the dimming action happen. The drawing shows a blue wire running between the two points. You need to be careful about adding extra lights to the circuit since the module can only handle a certain amount of current load. An excessive load will damage it.

Last edited by Cougar4; 06-11-2009 at 06:59 PM.
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Old 06-13-2009, 01:37 AM   #23
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So if I'd like for the lights to dim together with the dome lights, what are my options?

1. Replace the rest of my dome lights with LEDs, thus reducing the total load? Approximately how many LEDs would I be able to add?
2. Integrate a separate dimming module into the car? What all would I be looking at adding here?

Thanks for your help so far, Cougar!
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Old 06-13-2009, 11:02 AM   #24
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You're welcome for the help.

Using LEDs would reduce the current load but they don't act the same as a light bulb does when you reduce voltage to them.

You should be able to add a second module to run the new lights in parallel with the original module except for the output and tie the new lights to the output. I think the dome light is a 3 watt bulb so you would need to keep the load wattage to what ever the current module is driving.
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Old 06-13-2009, 02:10 PM   #25
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Okay, I've wired up one test puddle light using a 6LED Accent Light from superbrightleds.com (product info). I only bought one though, and they're pretty ugly.... so i'm still hunting for the perfect puddle light assembly to use.

Quote:
Originally Posted by Cougar4 View Post
You're welcome for the help.

Using LEDs would reduce the current load but they don't act the same as a light bulb does when you reduce voltage to them.
I was afraid of that but these LEDs are dimming rather well!

Quote:
Originally Posted by Cougar4 View Post
You should be able to add a second module to run the new lights in parallel with the original module except for the output and tie the new lights to the output. I think the dome light is a 3 watt bulb so you would need to keep the load wattage to what ever the current module is driving.
So I kinda lost you here... Would running the new module in parallel essentially allow it to be triggered by the original circuit? Think you can dumb that down and little more for me? My electrical knowledge is very very limited . I might be too curious for my own good.

Oh and the dome light is an 8 watt bulb, says the dome light assembly.

Thanks again

Edit: what do you think of this dimming module?

http://www.circuitdb.com/circuits/id/196

Last edited by simonbsays; 06-13-2009 at 02:19 PM.
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