2017 Nissan Rogue Driver's Side DTR Went Out, What Gives?

[CowboyState]

I have a 2017 Nissan Rogue. I noticed the driver's side DTR went out and was automatically suspicious of every light in an LED light bar going out. I looked further into it and realized the light would not shine when in normal DTR mode (it appears the two DTR lights shine brighter during the day vs. at night with the whole headlight on).



What made it weirder is they will shine dimmer when the whole headlight is one like you're driving at night.



Anyone know what gives?

[VStar650CL]

Both the halogen and LED factory headlight setups have a microcontroller inside that has control of the DRL brightness. On Nissans, most are keyed to the parking lamp circuit and dim when other exterior lighting is lit. Because the LED's are usually arranged in series on the internal circuit board, if any one element fails they will generally all go out. Barring a wiring issue, you'll need a new headlight assembly for the side that quit.

[CowboyState]

Both the halogen and LED factory headlight setups have a microcontroller inside that has control of the DRL brightness. On Nissans, most are keyed to the parking lamp circuit and dim when other exterior lighting is lit. Because the LED's are usually arranged in series on the internal circuit board, if any one element fails they will generally all go out. Barring a wiring issue, you'll need a new headlight assembly for the side that quit.

Would it be easiest to send it to the dealer and pay their costs for diagnosis, or just to replace the entire assembly myself?

[Sigster]

Since it apparently works in the dimmed state (when headlights are on)
wouldn't that mean that the LEDs are OK and that it's the 'switch' (SMART FET in the IPDM ?) responsible for the full brightness part that is at fault?
Unless there are 2 sets of LEDs, one for full-brightness DTR and one set that are dimmer.

Also, in the newest FSM I can look at (2016), it only mentions DTR ON/OFF, no dimmed state.
Is that a new thing for the 2017+ Rogues ?
Or could it be that they appear dimmer because the headlights are on and our eyes (and the camera) adjust to the increased brightness.

[VStar650CL]

No, they dim out. If you look at the wiring diagram, the module that controls the DRL's also controls the parks. When they're in park mode, the DRL's dim. The same SmartFET feeds the DRL/park module under all conditions, so the fact that it works dimmed means your power is okay. You can check the DRL signal into the headlight assembly, but if it's there, something in the controller is shot.