I went a slightly different path to converting the fog lamps to DRL. Here is what this method produces:
When the car is “on,” the fog lights are on. When the car is “off,” the fog lights are off. No modifications to the vehicle are visible, even when looking under the hood.
This approach is also about as cheap and simple as you can get. Beyond the fog lamps, the only thing required is a piece of wire and some solder. This solution will work with or without the fog lamp-capable control wand, so save some money and continue to use whichever one you already have.
We are changing the rules inside the IPDM so that it will send commands to the fog lamp relay based on the vehicle state rather than the fog lamp switch.
Before our change, when the IPDM receives the signal from the BMC that the vehicle is running, it pulls down line 4 on the bridge between its control board and relay board. When the IPDM receives the fog light on signal, it pulls down line 24. To be good DRLs, they should be on even when the headlights are off, which the normal fog light control does not allow.
Our change will send the line 4 signal to both line 24 and 4 and ignore the normal fog lamp control input.
Small screwdriver or other pry tool
Soldering iron and solder
Small piece of wire
What to do:
Pull out the IPDM (the black relay and fuse box under the air intake)
Open the IPDM
Mark jumper line 24 and 4 so you don’t accidentally solder the wrong ones together
Solder a jumper wire between line 24 and 4. (As a precaution against causing excess load on the control module, and thus heat and early failure, I also cut the control side of jumper 24, as you can see in the photo. In theory, the circuit is protected and this is not necessary, so it is your call.)
Install fog lamps if your vehicle does not have them. The Nissan ones fit much better than the much cheaper alternatives on eBay.
I also chose some nice Philips LED bulbs to make the DRLs more efficient:
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Unless you enjoy frequently changing the fog lamp bulbs, avoid the no-name LEDs. They generally have poor reliability.
Put it all back together and enjoy!
I made this modification a few months ago and have been very happy with it. I hope you will like it too!