[Avedis53]

Hi,

I have a 2014 Infiniti Q50 Premium. My daytime running light for the passenger side headlight went out two days ago. It came back for a short period of time but then went out again. The headlight works when the lights are on. The eyebrow DRL works when the headlight was on, the regular DRL does not when the headlight is on.

I checked the fuse box that is under the hood by the front driver side when you lift the cover it says the DRL fuse are there and I checked both and they look good. I have not checked the battery fuse box location yet.

What else could be an issue besides fuses that I should look at? Or should I just replace the fuses for the DRL's and try that.

I don't think you're checking the correct fuse for the passenger-side DRL. Fuse #72 (10A) protects the upper and lower DRL on the passenger side. It is located in the Fuse, Fusible Link and Relay Box that is bolted to the battery's positive terminal and also contains the DRL relay.

If fuse #72 checks out ok, then it could be the DRL relay. If the DRL relay is ok, it could be a faulty connector/wiring and if that's ok then it could be that the DRL LED has failed.

 

[Avedis53]

I'm not familiar with a fuse box location near the front of the car. According to the 2014 Q50 power supply, ground and circuit element section of the service manual, I see no fuse box where you are indicating. Here is the Fuse, Fusible Link and Relay Box and fuse/relay layout with it's location on the battery's positive terminal for a 2014 Q50.

 

[Avedis53]

I don't think the fuse box was relocated due to any accident. I'm only going by the field service manual for 2014. A picture would help. Is the internal layout of the fuse box the same as shown above?

 

[Avedis53]

Since you've replaced the DRL fuses and the DRL relay, unless you have a bad connector or a wiring problem I'd say your passenger-side front combination headlight unit has a bad diode for the DRL. You could take a multimeter and check continuity and voltage at the headlight connector to see if you have a bad connection. However, there are separate diodes for the upper and lower DRLs in the front combination headlight unit. You state that part of the passenger-side DRL works so I'd have to guess that the wiring and connector are ok and you are likely looking at replacing the combination headlight unit.

Yes, those are very expensive. Perhaps you can find one at a wrecking yard that's in working order to save some money. Good luck!

 

[Avedis53]

Could you tell which specific fuses you removed to turn off the DRL's please?

Thanks

Fuse #72 (10A) goes to the RH DRLs and fuse #73 (10A) to the LH DRLs. They are located in the Fuse, Fusible Link and Relay Box which looks like this:

This box is located here:

 

[Avedis53]

Hey folks,
If I could jump in to this topic. I'm having a similar issue but with a little twist. Both my DRLs work fine during the day but once the main low beam head lamp comes on at night my LH DRL stops working. RH DRLs work fine day and night. Only the left stops working.
I've check fuses 72 and 73 no issues there. even switch their position, no change. I've checked continuity on the LH light electric connector on pin 1 and Pin 4 and inspected the DRL relay looked good but went ahead and ordered a new one. (Waiting for it to arrive)
Any ideas on what could be causing this issue? Anything else I can look at before taking the car in?
Appreciate the help.

It could be that only half of the DRL relay isn't working properly but the fact that both side's DRLs work with the low beams off makes me think it is more likely the control circuit inside the LH combination headlamp. If that's the case, you're looking at a new headlight assembly as the control circuit is not replaceable.

 

[Avedis53]

hey man
I have got the same problem as you, my DRLs work fine during the day but not at night time my headlight bulb works but not the DRLs
what did you do to fix it? did u buy a new headlight or something else?

He hasn't been here for over 2 years, so I doubt you'll get a response.

Both side's DRLs don't work or just one side that doesn't work?

 

[Avedis53]

RH DRLs dont work checked the relays and the fuses but couldn’t find anything some said it might be the module

if fuse #72 (10A) is good as well as the DRL relay, then I would guess that the control circuit in the passenger-side headlight is faulty. That means a replacement headlight.