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2010 prius fog lamp


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wyciwug 
Copper - Posts: 156
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Location: Virginia, United States
Posted: October 19, 2012 at 12:40 PM / IP Logged  
Hello
I had a pair of foglights installed follow instruction. Everything works good. However, I would like make a modification where the fog lamps will turn off when i switch on Highbeam. Does anyone have a wiring diagram for this? Thanks
dcd
shortcircuit161 
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Posted: October 19, 2012 at 1:07 PM / IP Logged  
If you have the foglights with the switch inside, you can take the hot lead of that switch and cut it and place each end on a relay that's triggered by the high beam wire.
Relay setup is
Pin 85 - constant 12v
Pin 86 - High beam (-) trigger wire
Pin 30 - one end of cut wire from fog light switch
Pin 87a - other end of cut wire from fog light switch
Pin 87 - No Connection
Headlights-Hi     PINK     (-)     AT MAIN BODY ECU NEXT TO FUSE PANEL BEHIND LEFT SIDE OF DASH
shortcircuit161 
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Posted: October 19, 2012 at 1:39 PM / IP Logged  
Forgot to mention, please fuse the 12v Constant wire to the relay.
A 5-10 Amp fuse should be sufficient.
wyciwug 
Copper - Posts: 156
Copper spacespace
Joined: February 08, 2008
Location: Virginia, United States
Posted: October 19, 2012 at 3:52 PM / IP Logged  
My relay has only 4 pins, without 87a, can't I just use 87 in place of 87a?
dcd
shortcircuit161 
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Posted: October 19, 2012 at 4:58 PM / IP Logged  
It sounds like you are referring to the relay that came with the fog light harness.
I was referring to a new relay that would work with the current setup.
shortcircuit161 
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Posted: October 19, 2012 at 5:10 PM / IP Logged  
On a standard 5-pin relay, Pin 30 is the common pin that connects either pin 87 or pin 87a to it.
When the relay is not energized (via pin 85 & 86), it keeps pins 87a and pin 30 connected.
When the relay is energized, it then connects Pins 87 and 30.
We want a scenario where the relay energizes or triggers when the high beams are used. Therefore, you would want to use the wire that powers the fog lights and cause the new relay to "cut" the connection when the high beams are turned on by having pins 30 and 87a to separate.
2010 prius fog lamp -- posted image.
wyciwug 
Copper - Posts: 156
Copper spacespace
Joined: February 08, 2008
Location: Virginia, United States
Posted: October 19, 2012 at 9:25 PM / IP Logged  
I got it, i wired the 87, instead of 87a. I have only 4-pin relay. It works now, thanks
dcd
shortcircuit161 
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Posted: October 19, 2012 at 9:38 PM / IP Logged  
Great, glad it works!!

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