These issues started couple weeks ago. My car currently idle around 600-625. When I turn on the headlight the idle RPM drops to 600 or little under 600 and idle rough and then goes back. If I turn on the fog light the RPM drops lower and sometimes even to the point I feel the car is going to stall.
Also, since these issues started when I turn on the headlight I hear low level whining noise coming from the speakers and when I turn on the fog light the whining noise gets louder. Any idea what causing these issues? Thanks

 

What's the condition of your battery and alternator?

Id suspect one of those is about to crap out shortly. Might want to swing by a parts store and have your electrical system checked out.

 

Battery is a year old and alternator is original. When i turn the heated seats i don't have these issues, does the lights use more energy then the power seats?

 

I notice a slight change in idle when I turn my headlights on as well. Nothing drastic enough to make my car idle rough though. I just figured it was because the HIDs were kicking in.

Maybe I'll pull my battery and have that tested just to rule that out.

 

HID's do have a large power draw (upon initial startup) that puts a load on the alternator. The more electrical power being used, causes an increase load on the engine.

Sometimes a bad ground, or weak connection can cause the issue which is why i asked for the state of your electrical system.

Some drop is normal, but not ot the point of stalling out there car. I have ZERO drop if i turn on ALL of my accessories at once

 

I’ll stop at Auto Zone to test the electrical system.

Why I get whining noise in the speakers when I turn on the lights?

 

Electrical noise.

Does it rise and fall with engine RPM? Is so, it's coming from the alternator.

Have you changed anything electrical-wise with the car? Added grounding wires, or ran a power wire for anything? Amps?

Or is the car stock?

Could be a failing alternator, or a lost/corroded ground somewhere.

 

I added grounding kit years ago. Last year I replace the stock stereo wand added amps in the trunk but I didn’t have these issues after the install.

Several months ago I added Motordyne spacer but I don’t recall it causing any issues with the idle RPM and noise.

 

Well, that's an entirely different discussion. But since this problem is brand new, i wouldn't think that's your issue unless you just didn't notice it and it's gotten worse.

Giving electricity too many paths to ground by putting ground wires everywhere creates something called a ground loop. That can create electrical noise like you are noticing. Ideally you want ONE solid ground, vs many grounds.

But like i said, if your issue is new, i'd investigate elsewhere.

Reason why i'm dancing around on causes is because diagnosing eletrical gremlims over the internet is tough. I can really only make suggestions but really can't troubleshoot on my own. Based on what you've said, my top suspects would be a failing alternator or a grounding issue. Unless i could stick my head under the hood and start poking around, not much else I can do from here.

 

Took the car yesterday to NAPA to check the charging. The guy said that everything checked ok but he said that the battery is a little bit low on charge and when the car is under load the amp is low.

 

I don't know if I'd take the word of an auto parts store with issues like this. I'd want to know what's dragging down the rpms when I turn on the headlights. Either you have a wire issue in the headlight system or in fact your alternator is weak. I have a 10 wire Gordee grounding system that I installed 7 years ago, doesn't make noise or cause any issues. If you have the funds stop by Nissan and have them check this rpm drop issue out....Gary