DIY: Rear Fog Light Wire Via BCM and Stock Wiring

ChrisSlicks · 04-22-2011, 09:41 PM

Quote:

Originally Posted by spearfish25

Chris is right.

I just ordered this to get my indicator light and switch all in one. It will also require a 500 ohm resistor in series since the LED is 2.1V.

Digi-Key - 679-2343-ND (Manufacturer - IRR3S422L0S)

Go with a 560 ohm or a 680 (for just slightly dimmer) as the supply voltage could slightly exceed 12V and LED's are sensitive to over-voltage.

Hugoneus · 04-25-2011, 10:06 PM

I have a question for you, if I were to apply 12V to the orange wire, would the fog light simply turn on?

ChrisSlicks · 04-26-2011, 06:45 AM

Quote:

Originally Posted by Hugoneus

I have a question for you, if I were to apply 12V to the orange wire, would the fog light simply turn on?

If you disconnected the other end of the orange wire from the BCM and installed a fog light, yes. There is no fog light in our cars stock, just a place holder.

spearfish25 · 04-26-2011, 07:13 AM

Quote:

Originally Posted by Hugoneus

I have a question for you, if I were to apply 12V to the orange wire, would the fog light simply turn on?

Yep. That's the other option here if you've installed a real fog light. Tap an ignition switched 12v source into the orange wire with an on-off toggle switch of your liking. You'll be able to turn the fog light on at any time (even with headlights off), and it should turn off when you shut down the car.

As Chris said, I'd disconnect the orange wire from the BCM rather than just splice into it while still connected.

spearfish25 · 04-26-2011, 07:16 AM

Quote:

Originally Posted by ChrisSlicks

Go with a 560 ohm or a 680 (for just slightly dimmer) as the supply voltage could slightly exceed 12V and LED's are sensitive to over-voltage.

Does the supply voltage go as high as the battery voltage in the center gauge cluster (14.4v)? When I use a multimeter, I always get right around 12v in various circuits. But as you said, I'd need a 610 ohm resistor for a 14.4V source and a 2.2V LED.

ChrisSlicks · 04-26-2011, 09:13 AM

Quote:

Originally Posted by spearfish25

Does the supply voltage go as high as the battery voltage in the center gauge cluster (14.4v)? When I use a multimeter, I always get right around 12v in various circuits. But as you said, I'd need a 610 ohm resistor for a 14.4V source and a 2.2V LED.

Reading the service manual it does explicitly state 12V so that should mean that the voltage is regulated. In other parts of the manual if a circuit receives full battery voltage it will indicate that. Sorry for the scare.

I usually under-volt LED's by 0.1 to 0.2V to extend their service life, but in this case I don't think it is going to matter whether the LED lasts 10,000 hours or 50,000 hours.

04-25-2011, 10:06 PM	#2 (permalink)
Hugoneus Base Member Join Date: Feb 2010 Location: Milky Way Posts: 245 Drives: 2010 370z T+S+N 6MT Rep Power: 17	I have a question for you, if I were to apply 12V to the orange wire, would the fog light simply turn on? __________________ 2010 Cherry Black Nissan 370z + Black Interior + 6MT Touring + Sport + Navigation + Painted Splash Guards + Illuminated Kick Plates + Fog Light + Floor Mats + Clear Bra

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