LED Daytime Running Light (DRL) Upgrade on Sport S

ttepps

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Hi all,

I do not see this specific question answered on the forum so I am hoping someone can help. It looks like @Gregj really understands the DRL setup.

I’ve installed after-market fender DRLs on my 2021 Sport S. These ones are specifically designed to fit the Sport fender and are plug and play. They are similar configuration to the stock LED fender lights in the Sahara or Rubicon. The turn signals include resistors so there is no programming needed. Install went well.

https://www.extremeterrain.com/axia...ing-turn-signal-lights-smoked-j155019-jl.html

I changed the pins on the wire harness so that the top white light connects to the DRL circuit in the existing body harnesses instead of the parking light circuit. I used JSCAN app to activate the DRL circuit. I live in Canada so DRLs are compulsory. In Jscan, I set the following:
  • Set “Left Dedicated DRL Lamps Output Present” to Active
  • Set “Right Dedicated DRL Lamps Output Present” to Active
  • Set “LED Dedicated DRL Present” to Active
  • Set “DRL Lamp Location” to Dedicated
This activated the circuit and the dedicated white fender lights come on. Mine are on when the Jeep is in gear and the parking brake is off and the headlights are off. This is typical DRL behavior for most vehicles, however, I’ve noticed on Jeeps with the stock LED fender lights that the white lights are on all the time; even with the headlights on. It’s as if they are DRL + Park lamps use the same lamp.

I am not sure if I am missing a setting that keeps the DRLs on even with the headlights on, or if the stock fender lights are wired so that the white lights are powered by both the DRL circuit and park lamp circuit and this was missed in the after-market configuration of these lights. Does anyone know if there is a setting in Jscan to keep the DRLs on while the headlights are also on? Or is this a wiring thing. I could wire the DRL Circuit and park lap circuit together, but I’m not sure if that would cause other problems. I've enabled and disabled the DRL Dropout on Jscan but that only changed their behaviour while using the turn signals.

From a legal standpoint, they are fine the way they are; the Jeep always has forward facing white lights which is what’s required in Canada. I do like and wish the white fender lights stayed on while the headlights were on though like the stock LED setup. It looks much better.

The below picture shows the Pins in the body connector. All are in use except for Pin 4. Park Lamps are only when the lights are on, so them alone do not work for DRL functions in Canada because if they are off during the day. Does anyone who understands vehicle electrical know if connecting the wires coming from Pins 4 and 5 and running those to the white light would cause issues with the BCM? This would keep them on almost all the time.

Left PIN Arrangment.png

 

Gregj

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Travis, you are correct, the DRL’s act as marker lights when the headlights are on. They illuminate at a lower level at night. I’m sure this is accomplished with circuitry in the light itself.

As for the idea of connecting pins 4 and 5, I don’t know how the BCM would react. I guess back feeding the wires to the BCM could be prevented with some diodes but this is an area beyond my skill set. As an option, if you wanted them to be on any time the Jeep is on you could treat them as Halos and use a fuse tap to the heated seat circuit, that would turn them on all the time but they wouldn’t drop out with the turn signals.
Gregj
 
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ttepps

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Thanks for the reply @Gregj. I was hoping there was a setting in Jscan I was missing that would turn them on with the headlights too. I will try to do some research about how a BCM reacts to back flow for connecting the leads from Pins 4 and 5 together, or into the diode option.

I guess in the stock LED fender lights the white strip does run off both circuits: DRL circuit when lights are off, at full power; and park lamp circuit when lights are on, at a reduced power or modulation. That's how I assume it has the two lighting levels depending on the situation. I know the Sahara and Rubicon builds do have both circuits running to the fenders.
 
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ttepps

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I have not got around to the wiring to make the white strip work as DRL and parking lights together. I'll provide an update when I make that change.

I did notice the other day that the new DRLs are not overly visible during the day. The turn signals are very bright. This may be that the new LEDs poor quality, but I was checking the setting in Jscan and noticed the following voltages in the Light Voltage Regulation Menu. Keep in mind that my Sport S came with full Halogen set up and has now been converted to full LED with all after market LEDs except for the headlights and fog lights; which are the Mopar LEDs.

My readings are:

Left/Right Front Corner Voltage - 13.6 Volts
Left/Right High Beam Voltage Regulation - 13.6 Volts
Left/Right Low Beam Voltage Regulation - 13.6 Volts
Left/Right Rear Corner Voltage - 12.8 Volts
Left/Right side DRL Voltage Target - 11.0 Volts

There seems to be no voltage settings available for any turn signals

I am going to bump up the voltage for the DRLs because 11.0 seems low. I know that halogen DRLs are set from the factory to use high beams at reduced voltage (I read 7 volts, but many that was wrong), but when I changed the location of the DRL, perhaps the voltage remains at a lower setting even though its now a dedicated LED.

Can anyone with Jscan who has a full LED set up from the factory give me their readings from the Voltage Regulation menu for all of the above? Assuming you've left them at the factory defaults.

Thank you in advance.

Travis
 
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I've been trying to figure this out as well.
I have Rubicon fenders with LED DRL's on my Sport. When driving during the day, only the amber part stays on as DRL's and not the white. But when I turn the headlights on, the white fender LED's turn on.
I kind of like how the ambers being on looks different from everyone else, but it looks a little weird with the halo's on.
So would all I have to do is switch a couple of the pins around?
 

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I've been trying to figure this out as well.
I have Rubicon fenders with LED DRL's on my Sport. When driving during the day, only the amber part stays on as DRL's and not the white. But when I turn the headlights on, the white fender LED's turn on.
I kind of like how the ambers being on looks different from everyone else, but it looks a little weird with the halo's on.
So would all I have to do is switch a couple of the pins around?
Have you changed the settings in the BCM? It seems like the DRL location has not been changed to “dedicated”.
Gregj
 
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ttepps

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I agree with Gregj. It sounds like your DRL settings are set to turn signal and not dedicated in the BCM. The DRL pin in the connector is the same on the Sport and Rubicon so repinning should not be required. I only did it because the lights I got did not have a DRL circuit at all. The stock LEDs would have it.
 
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Have you changed the settings in the BCM? It seems like the DRL location has not been changed to “dedicated”.
Gregj
I agree with Gregj. It sounds like your DRL settings are set to turn signal and not dedicated in the BCM. The DRL pin in the connector is the same on the Sport and Rubicon so repinning should not be required. I only did it because the lights I got did not have a DRL circuit at all. The stock LEDs would have it.
I have a tazer mini and it doesn’t have in depth options like the jscan does. But I did turn on DRL and set them as LEDs. I’ll double check them tomorrow.
Thanks for the help though
 
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I agree with Gregj. It sounds like your DRL settings are set to turn signal and not dedicated in the BCM. The DRL pin in the connector is the same on the Sport and Rubicon so repinning should not be required. I only did it because the lights I got did not have a DRL circuit at all. The stock LEDs would have it.
Actually now that you mention it, I think I may have selected turn signal as my DRL location because I didn’t really know what dedicated meant. Guess I’ll check that tomorrow and change it to dedicated.
 

iamstillvince

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haven't seen it mentioned but also a note as i see you are in Canada. the lights are different in canada, honestly dont remember all the differences but even a sport from Canada and US have different lights so programing is probably different. it gets confusing
 
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Ok so I did have my DRL’s set to turn signal. Switched it to dedicated and that solved my problem. Thanks for the help.

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