Anytime Fog lamp

Cheap! · Jul 7, 2006

I have a question about the anytime fog lamp mod. I noticed that you must have the running lights on to make the fog lamps work. It there anyway to make the fog lamps work without the running lights being on? Is there a wire that is hot only when the car is on that would allow me to turn on my fog lamps only? I figure the diode is being used to get power from the running lights. Is that correct? If I could find another source that meets my specs., (Only works when car is on), I would not have to worry about the fog lamps being on when I turn off the power switch. Any Ideas?

efusco · Jul 7, 2006

AFAIK, the mod using the diode does NOT require the headlights to be on (USA Prius does not have 'running lights').

finman · Jul 7, 2006

Try the atttached doc.

Cheers,

Curt.

Cheap! · Jul 7, 2006

<div class='quotetop'>QUOTE(finman @ Jul 7 2006, 11:45 AM) [snapback]282571[/snapback]</div>

Try the atttached doc.
Rewiring fog lights on my 06 pkg 6. Since I Have HID's, standard 1/2 voltage DRL's arent' possible. It took a bit of work and it isnt for the faint of heart but works like a charm. Now to upgrade the bulbs themselves.

First, the Fog Light relay under the hood (long relay box in center of engine compartment) only has power when the park lights are on. Starting here, unbolt the 2 10mm bolts and flip the box over, remove the cover and you will see the back of the relays. Locate the Fog lamp relay (2nd from left) and cut the BROWN wire a few inches away. You will now connect this to the PURPLE of the PTC HTR 2 relay next to the fog relay. This is an IGNITION - ON feed and allows the relay to be triggered only when the Igntion is ON. Put everything back together. Now the relay can only operate when the car is ON - instead of only when the lights are on.

Next pop the bottom cover off of the steering column and access the flasher/lights plug( See knowledge base info under EV switch for details) Find the ORANGE wire (fog light switch ground - provided by low beam switch)...cut it and jump the switch side to the DARK GREEN wire in the same harness(low beam switch ground). Tape off the other cut ORANGE wire end and your done here. Put the column back together. You have now allowed the FOG switch to use a CONSTANT ground signal, unaffected by the headlight switch.

This is the hard part, following other instructions on the site, You can either follow the directions for accessing the 2 wires given in the Knowledge BAse article about making the Fog Lights work independant of low beams or do it my way(easier on the back . Drop the lower dash panel, remove the 3 10mm nuts securing the metal plate, and then the 3 10mm bolts securing the fuse box/body ECM to the dash (top 2 bolts are machine thread, left bolt is a coarse thread into plastic). Release and unplug all of the plugs on the FRONT (side facing the driver's seat) of the fuse box. MAKE SURE THE CAR IS OFF before doing this. (this will erase the clock and MPG memory).

At this point, it will be easy to rotate the fuse box around and see the Body ECU plugs on the back top. 3 plugs. You want to unplug the one closest to the drivers side.

Locate the YELLOW and Lt. BLUE wires in pins 13 & 17 (they are caddy -corner to each other). Cut them off and connect the car sides of the wires to each other. Tape off the ECU sides and put everything back together. You have now just bypassed the Body ECU's ability to regulate Fog light usage.

So, now, when you turn the Fog light switch ON, you provide a direct ground to the Fog Light Relay under the hood which receives it power now from Ignition. The Fog lights can now be left on and will come on when the vehicle is started. They are totally unaffected by head/park light usege.

Took me about an hour but add a few hours for those not as familiar with electrical work.

Cheers,

Curt.
[/b]
Click to expand...

Curt, thanks.

Please help me understand this a little better.
1. Relay can only operate when the car is ON - instead of only when the lights are on. "Only gives the relay the ability to operate?"
2. FOG switch to use a CONSTANT ground signal, unaffected by the headlight switch. "Ok, have the ground always available so it is there when you need it.
3. You have now just bypassed the Body ECU's ability to regulate fog light usage. Why do I need this?
With the ground active won't the fog knob work without this?

finman · Jul 10, 2006

1. Relay can only operate when the car is ON - instead of only when the lights are on. "Only gives the relay the ability to operate?"
2. FOG switch to use a CONSTANT ground signal, unaffected by the headlight switch. "Ok, have the ground always available so it is there when you need it.
3. You have now just bypassed the Body ECU's ability to regulate fog light usage. Why do I need this?
With the ground active won't the fog knob work without this?

1) Having NOT done this...yet...it sounds like an '89 Prelude fog light mod I did: The park lites 'powered' the fogs. Doing this mod just moves that powering to a different source (an IGN) that comes on with the key, not the park lites, so the park lites are out of the picture for providing the 12 V source. Now it will be the new IGN wire.

2) ??? not sure of the wording here...I got this document from someone else.

3) I'll have to actually do this mod to be able to help, sorry!

Cheers,

Curt.

cagemo · Sep 29, 2006

Hi Finman - could you (or someone?) repost the foglight mod doc? It seems to have disappeared during the last hack. Thanks!

finman · Jan 24, 2007

I am finally re-posting the foglight rewire word document and a jpeg diagram. sorrry I haven't been on this board to do this...change is afoot for me...moving, job change, the whole thing. I am doing this mod tomorrow as it's supposed to be near 60 degrees! I'll try to update if I can....

Curt[attachmentid=6326]

apparently the jpeg won't attach...

darelldd · Jan 24, 2007

<div class='quotetop'>QUOTE(Cheap! @ Jul 7 2006, 08:00 AM) [snapback]282540[/snapback]</div>

I have a question about the anytime fog lamp mod. I noticed that you must have the running lights on to make the fog lamps work. It there anyway to make the fog lamps work without the running lights being on? Is there a wire that is hot only when the car is on that would allow me to turn on my fog lamps only? I figure the diode is being used to get power from the running lights. Is that correct? If I could find another source that meets my specs., (Only works when car is on), I would not have to worry about the fog lamps being on when I turn off the power switch. Any Ideas?
[/b]
Click to expand...

hill · Jan 25, 2007

I was gona say darell did I nice display ... and above it looks like he started to show the thread .... then ... ??
Must of lost his train of thought

Think it's on his web page.

finman · Jan 31, 2007

Here are my pics for this mod. Works like a charm. any questions, just ask! Love to help...

Curt.[attachmentid=6396][attachmentid=6397][attachmentid=6398][attachmentid=6399][attachmentid=6400][attachmentid=6401][attachmentid=6402]

vinnysca · Jan 31, 2007

Thanks to this forum, I also followed the instructions for turning my fog lamps into optional DRLs. Works like a charm!

Thanks guys!

Vince

Anytime Fog lamp

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Attached Files:

FoglightRewire.doc

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Attached Files:

fog0.jpg

fog1.jpg

fog2.jpg

fog3.jpg

fog4.jpg

fog5.jpg

fog6.jpg

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