Low beam circuitry - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Everything Electrical & Electronic Have an electrical problem? Lighting, Alternators, gauges, DIC, HUD, etc? Post it here. Please post Audio problems in the Audio forum, and Engine control problems in the appropriate Mechanical forum for your year.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-24-2007, 03:34 AM   #1
Senior Member
True Car Nut
Thread Starter
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default Low beam circuitry

Where'* the circuitry for my headlights? If I want my low beams to come on and have something else come on as well, where do I plug in the wire? I would like to go to an non-fused source so that I can draw as much power as I'd need to.
radomirthegreat is offline   Reply With Quote
Old 10-24-2007, 08:01 AM   #2
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Ding Ding Ding is what you will hear for the rest of your life if it'* not an LED.

The DIC,(We'll call it DH for short ) will tell you ever time they lights turn on and the car turns on until you fool the module for the lamp monitor or you unhook your extra accessory.

Back to the actual question though. Are you using a relay to pull power from say the battery that is right up close to the lights and then want the light circuit to turn it on?
BillBoost37 is offline   Reply With Quote
Old 10-24-2007, 12:34 PM   #3
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

I had my Bonnie set up so when the HI beams came on, the LOW beams were on too. Bill is right about the DH monitor.

Fuse your connections and use a relay that is rated for the power and thick enough wire for your connections. Not fusing is a fire waiting to happen.

What exactly are you trting to accomplish? The circuitry for the headlights is in the dash, obviously, but it'* a lot easier to access the wires to the headlight under the hood.
Cheetah is offline   Reply With Quote
Old 10-24-2007, 01:06 PM   #4
Senior Member
True Car Nut
Thread Starter
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default

When the low beams come on, where is that power coming from? I believe I should be able to set up another relay that would "see" the headlight circuitry light up and then power some more driving lights. I believe it'* fully possible to avoid the chimes if I just use the source of the headlight power to activate an extra circuit that would power some more stuff.

I'm sure this can be done with anything, even with something like the dash lights if I can find which circuitry controls that. Please hold for my extremely strange graphical explanation of what I'm trying to accomplish.
radomirthegreat is offline   Reply With Quote
Old 10-24-2007, 01:31 PM   #5
Senior Member
True Car Nut
Thread Starter
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default

This is my strange way of explaining the situation. Enjoy the link.
radomirthegreat is offline   Reply With Quote
Old 10-24-2007, 01:43 PM   #6
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

I am not sure how the DH sensor "sees" that the lights are working; I do not have a FSM for my car.

My theory is that is uses a resistor, something similar to the one used in the DRL'*. The monitor reads the voltage accross that resistor, and if within tolerance, no light. If it diveates... ding, ding, ding.
Cheetah is offline   Reply With Quote
Old 10-24-2007, 01:46 PM   #7
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

Your talking about adding accesory lights? The lamp monitor will not detect accesory lights.

You could take the 12+ volt lead from the headlight and run that to a relay. Doing that will not set off the DH
Cheetah is offline   Reply With Quote
Old 10-24-2007, 01:50 PM   #8
Senior Member
True Car Nut
Thread Starter
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default

EDIT I missed that last comment. Yes, I'd like to add something that the lamp monitor doesn't need to see. Can I get closer to the dash rather than going to the headlights with a relay? /EDIT

I don't think this has been explained well. I think I have made it more confusing than it needs to be. If the comic didn't help, and I don't know if it ever could have (but it was fun to make), then I have this:

When the low beams are off, nothing should be out of the ordinary. However, when they're on, I want to put in something non-stock that has not yet been in the car to see that they're on. When there'* 12V going to the bulbs for the low beams, I want to identify that source of electricity and put right next to it a relay (for example) that would attach with a thin wire to know when there'* power going to the low beams. At this point, it should turn on an entirely new circuit that I'll deal with later.

But the point is that I'd like to know where the origin of the power for the headlights is and how to get to it to put something extra next to it to have an automatic turn-on function for anything I'd like to turn on additionally with the low beams.

How was that explanation? I hope I've got it all cleared up now. Please ask if you have any questions. Also, I don't necessarily need the source if it'* too strange to get to, but I'd like the closest point to the fuse panel inside the engine bay that would have access to either of the lines going to the low beams.
radomirthegreat is offline   Reply With Quote
Old 10-24-2007, 02:13 PM   #9
Senior Member
True Car Nut
 
Join Date: Feb 2006
Location: Somewhere different on the globe every month....
Posts: 2,896
Thanks: 0
Thanked 0 Times in 0 Posts
Cheetah is on a distinguished road
Default

You can pull a wire off of the low/high beam switch at the bottom of the steering colum, which is inside of the cabin of the car, and you could also pull a relay form that wire, too.

Your revision is good, your drawing, not so Just Kidding
Cheetah is offline   Reply With Quote
Old 10-24-2007, 02:24 PM   #10
Senior Member
True Car Nut
Thread Starter
 
radomirthegreat's Avatar
 
Join Date: Sep 2006
Location: Indianapolis, IN
Posts: 4,606
Thanks: 0
Thanked 0 Times in 0 Posts
radomirthegreat is on a distinguished road
Default

Thanks. I'll have a look at the repair manual and see if I can find the relay that does the headlights. At least I'll just take out the relays one by one and find which one has the headlights not turn on.

Would anyone happen to know if I could just jam an open wire onto the tooth of the low beam fuse, put in the fuse, and then run that wire to a relay? I'll just get the power for these lights straight off of the battery cale and then fuse it before the lights if things go the way I plan.

No comments on the comic? Dude, that was the first one I ever made! Really.
radomirthegreat is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Rear window defog circuitry. impatient99 1992-1999 21 09-19-2014 06:02 PM
HI-BEAM & LOW BEAM HID panda1956 1987-1991 7 08-11-2006 09:06 PM
Metal cap on low beam headlights Twister97 1992-1999 5 02-21-2004 02:20 AM
Enabling Low Beam while Hi Beam is on Drifter420 Everything Electrical & Electronic 15 10-22-2003 05:15 PM
80 Watt Low Beam Bulbs - good idea or not? mylehigh2000 1992-1999 14 08-26-2003 10:28 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:49 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.