Desperately Need Help Getting Fog Lights Working Again - Toyota Yaris Forums

CTScott · 11-16-2010, 09:48 PM

The red wire is not an ideal place to grab switched power. That is the feed to the fuel pump.

M4One · 11-17-2010, 12:35 AM

Quote:

Originally Posted by CTScott

The red wire is not an ideal place to grab switched power. That is the feed to the fuel pump.

I installed the fogs using this method without problem until a couple of months ago. Assuming I get them working again the same way, are you suggesting I could end up with problems down the road?

To Focus_Sh1ft, how exactly did you hook the white wire to the battery? Did you wired it like in my diagram, just getting rid of the relay, or through a different method? Ripping everything apart is going to be a last resort for me.

CTScott · 11-17-2010, 08:54 AM

Quote:

Originally Posted by M4One

I installed the fogs using this method without problem until a couple of months ago. Assuming I get them working again the same way, are you suggesting I could end up with problems down the road?

To Focus_Sh1ft, how exactly did you hook the white wire to the battery? Did you wired it like in my diagram, just getting rid of the relay, or through a different method? Ripping everything apart is going to be a last resort for me.

The reason I don't like tapping that circuit for switched power is that if something goes wrong with the switch side of the fog circuit, you will blow the fuse for the fuel pump, which will keep the car from running. The OEM wiring method for the fogs uses an independent fuse for the fogs, so that a failure will be isolated to that circuit and the car will still run.

Focus_Sh1ft · 11-17-2010, 02:02 PM

Alright I remember how I did this - lemme clarify.

All I did was splice the end of the red wire to the white wire, then placed it in the ACC position. That's the power wire and it should be fused. That ran to a radioshack switch, then the wires that connect to the fogs run out the other side of the switch. So basically you'll have a +12v feed running from that ACC pinout, to the switch, then to the fogs. This setup will turn the fogs off when the car is turned off as well.

I didn't realize the fuel pump took a feed off that point, so CTScott is right - you really should fuse the fog light wire side as well.

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11-16-2010, 09:48 PM	#1
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The red wire is not an ideal place to grab switched power. That is the feed to the fuel pump.

11-17-2010, 02:02 PM	#4
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	Alright I remember how I did this - lemme clarify. All I did was splice the end of the red wire to the white wire, then placed it in the ACC position. That's the power wire and it should be fused. That ran to a radioshack switch, then the wires that connect to the fogs run out the other side of the switch. So basically you'll have a +12v feed running from that ACC pinout, to the switch, then to the fogs. This setup will turn the fogs off when the car is turned off as well. I didn't realize the fuel pump took a feed off that point, so CTScott is right - you really should fuse the fog light wire side as well.