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Old 06-10-2005, 02:13 PM   #1
RS Paul
Scooby Newbie
 
Member#: 87520
Join Date: May 2005
Default 2004 headlight wiring diagram question

I've been studying the headlight and foglight circuits in the electrical
service manual for our Canadian 2004 RS and have found something
I can't figure out.

Namely pages WI-135 (Section 26. Headlight System, model
without HID) and WI-133 (Section 25. Front Fog Light System).

The high-beam relay is closed whenever the low beams are on
(and they are turned on and off by the headlight switch itself
which seems weird to me as this defeats the purpose of a relay).
The relay is also closed in the "pass" position of the switch, but
this is a completly separate circuit.

So pin 4 of the highbeam relay is either at 'nothing' or at 'ground'.

The fog lamp circuit needs 12v to come from somewhere to
power the fog lamp relay coil and the on/off light in the fog lamp
switch.

I understand that at least on some 2003s the power came through
the high beam filament which was at 12v when they were off, and
ground when they were on. This appears to be the purpose of the
wire going from the high beam relay to the fog light circuit, except
that because of the way the low beam circuit is shown, this never
happens in the 2004.

Am I missing something, or is there an error in the manual ?
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Old 06-12-2005, 03:47 PM   #2
RS Paul
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Member#: 87520
Join Date: May 2005
Default

I can now answer my own question...

Since the high beam relay is closed whenever the low beams are
on there is indeed 12v present at pin 4 of the relay.

How bad is it for the headlight switch to be switching the high
beam current instead of a relay ?

I think I'm going to ponder redoing some of this wiring...
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Old 10-08-2005, 06:13 PM   #3
LYHTSPD
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Member#: 26374
Join Date: Oct 2002
Chapter/Region: MWSOC
Location: SW Indiana
Vehicle:
2004 WRX Sedan
San Remo Red

Default

Quote:
Originally Posted by RS Paul
I can now answer my own question...

Since the high beam relay is closed whenever the low beams are
on there is indeed 12v present at pin 4 of the relay.

How bad is it for the headlight switch to be switching the high
beam current instead of a relay ?

I think I'm going to ponder redoing some of this wiring...
So are you saying that pin 4 of the highbeam relay has a GND signal when the highbeams are on, and a +12v signal when the highbeams are off?
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Old 10-09-2005, 10:02 PM   #4
RS Paul
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Member#: 87520
Join Date: May 2005
Default

Quote:
Originally Posted by LYHTSPD
So are you saying that pin 4 of the highbeam relay has a GND signal when the highbeams are on, and a +12v signal when the highbeams are off?
That's right. Whenever the low beams are on the highbeams are powered
on, but they are not grounded, so the 12v leaks through the highbeam
filaments. To turn on the highbeams the lightswitch grounds this wire
(must not be great for the switch) and pulls pin 4 to ground along with
it.

For more info see :

http://pages.videotron.com/perrons/P..._diagrams.html

One of these days (hopefully before my headlight switch burns up) I'm going
to re-wire my headlights with proper gauge wiring and a highbeam relay that
acts like a relay instead of acting like a controller for the fog light relay (can
you say "kludge" ?)
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