Electrical question for hyundaitech

hyundaitech,

I don't know if you can help me with this question but here goes. I'v
got a 2003 GLS with sunroof. Unfortunately, the map light switche
aren't illuminated and I'm tired of driving at night and fumblin
around trying to find the map light switches, only to hit one of th
the roof switches by accident and have the roof retract on me. Havin
that happen is especially frustrating when it's raining out. To solv
that problem I want to install two very small 12 volt LED's into th
sunroof control panel to mark the position of each of the map ligh
switches. Physically installing them into the panel won't be a problem
My problem is trying to figure out where I can tap into the contro
panel itself to get a switched 12 volt positive feed for the LED's.
bought a spare sunroof control panel to play around with and I've fe
12 volts into it and I've noted what each of the connections are for
For obvious reasons, I'd like to try and tap into the power connection
in the sunroof control panel or headliner and avoid running power lead
to junctions elsewhere in the car. I've got the Elantra electrica
manual, but after looking at that for a while everything starts gettin
blurry. I'd love to be able to power the LED's on when I turn on th
parking lights or headlights but I guess I'd be happy if I can ge
power to the LED's when I turn the ignition switch on. I really don'
want to have the power feed be hot all the time for obvious reasons
One thing that I may be able to tap into is the spare roof lamp harnes
that's up in the headliner. I saw that unused harness when I wa
installing the one-touch sunroof control relay some time ago but I kno
that room lamp is controlled by the ETACM. Any suggestions that you ca
pass along will be greatly appreciated. I don't suppose Hyunda
redesigned that panel to incorporate lighting for the map ligh
switches? Thanks for your time

 

Probably the easiest/nearest place to tap in would be the brown/black wire
going to the sunroof relay. This wire has switched power. According to
the schematics, the only wires power wires going to the lamp/sunroof
control assembly either have constant power. The brown/black wire goes
through the relay coil side before getting to the lamp/sunroof control
panel.

If you want to use the tail lamp circuit, the rheostat (dimmer switch) is
a good place to tap in. Wire the positive LED lead to the black wire at
the rheostat. Then wire the negative to the green wire if you'd like the
LED to dim with the rheostat, or simply attach to ground if you want full
LED illumination anytime the tail lamps are on.

The wiring to the roof panel runs up the left front pillar. The trim
should simply snap off. It's probably not a terribly involved project if
you wanted to actually tap into the dimmer.

 

There's a simpler solution; install a tactile indicator of some sort on
each button. It can be something as simple an unobtrusive as one of the
small rubber buttons used on computers, furniture and the like. You can
get them at any hardware store or home center in a variety of shapes,
sizes and colors.

 

I checked the schematic and you're absolutely correct. I think that'
the (very simple) answer that I've been looking for. Thank you fo
pointing that out. I was so focused on taping into the control pane
lighting circuitry that I forgot all about the relay circuitry. I
looks like pin 2 on connector M96 will do it. No doubt that would wor
with the stock relay, but I'll have to see if that will also work wit
the one-touch relay that I installed. I also appreciate the othe
suggestion about tapping into the rheostat. It sounds easy enough eve
with having to remove the trim panel. Having the LED's tied int
illumination control would be even sweeter and I may end up going tha
route eventually. For now, just getting illuminated indicators overhea
would be a tremendous improvement over total darkness. Thank you!

You did such a great job with that question, I'm wondering if I ca
bother you with one more electrical question about the Elantra. I nee
to install a dash switch to control my GLS fog lights so I can tur
them on and off as needed. The power and ground connections for th
switch in the cabin will be pretty straightforward, but somehow I nee
to get a powered lead (connected to the new switch) from the cabin
through the firewall, and then into the engine compartment. Just on
wire would do it for me. I've looked just about everywhere for
simple, easy access point or plug, but short of drilling a hole throug
the firewall I can't see a very direct route, although I may hav
overlooked an access point somewhere. I was hoping that one of th
harnesses going through the firewall would have an unused lead and
just could hitch a free ride on that. But from what I can see, i
doesn't look like Hyundai has any unused leads in the harnesses. I
your vast experience, do you know of or have a fairly simple suggestio
for getting a single wire connection from the cabin and into the engin
compartment by going through the firewall or otherwise on an '03 GLS?
don't mind doing a little work to make it happen as long as it doesn'
involve tearing the entire dash out or pulling a fender off the car.
asked my dealer how I could do it, and I was even williing to pay the
to do it, but they didn't even want to talk about that kind of "voodo
magic". I'm open to suggestions. Thanks again for the help

 

But in the dark you still have to reach and feel around for the tactile
button. With an LED, you go right to it. I too, often fumble for the
switches.

A simple feature I miss is having the dome light come on when I turn the key
off. When I pull into my driveway at night, I turn the car of and I'm
sitting in the dark looking for the papers on the seat, of my hat, etc. In
my Buick, the light comes on as soon as I remove the key and stays on for
some time after I exit. The Buick also cost thousands more and yes, you do
have to drop some little features to keep the cost in line.

 

I guess, but it seems to me to be easier to just learn where the
switches are.

 

I'll need to look into this tomorrow. I'm not at work and am on Mac, so I
can't view the website.

 

You use a Mac? Man, you really are a liberal!!!

Eric

 

No, Mac users are Independents. Liberals still use terminals off or an
IBM mainframe so they can control what the users do!

Matt

 

Start by checking to see whether you already have fog lamp wiring in your
car. Are the connectors for the fog lamps themselves present? Do you
have a fog lamp relay in the underhood fuse box? Is there a 15A fog lamp
fuse in the underhood fuse box? Is the green/orange wire for the fog lamp
switch present at pin 12 of the multifunction switch connector?

If all these things are present, all you really need to do is tap into the
wire at the multifunction switch connector for your own switch (or even
replace the multifunction switch with one for fog lamps), find a ground
for the switch, and mount the lamps and connect to the connetors/wires
already in place. Even if the wire at the multifunction switch is the
only thing present, that's your path from inside the vehicle to outside.

I know it'll make you dizzy, but comparing the schematic to what's present
on your car is an excellent place to start. Then it's a matter of
engineering something simple to work with what's already there.

 

Unfortunately, there's no fog light relay or relay socket in th
underhood fuse box and consequently no harness wiring that I can see
Nada. No fog light connectors either. Yeah, I know, that would hav
been too easy. I've already checked for that. I'll have to check an
see if there's anything at all at the multifunction switch becaus
you're right, that would provide access through the firewall. There'
no relay socket connections in the underhood fuse box so I kind o
doubt there's any existing harness wiring anywhere. I was jus
wondering if in your experience you knew of an easy way to do that o
knew of an available access point through the firewall. Thanks agai
for your help