Head light noise in 2015 Yukon Denali

[benjamminharris]

When using key fob to unlock doors is it normal when the headlights and taillights come on to make a low pitch noise?

 

[Thrust]

Yes

 

[Joseph Garcia]

Yes

Could you elaborate on your 'yes' (if you know) so that the OP will know why there is a low pitch noise?

 

[shock]

I think you’re hearing the fuel pump priming. It will do it as well if it has been sitting unlocked when you open a door.

 

[CMoore711]

I never noticed it so much with the tail lights but would hear the noise you’re referring to with the headlights.

You’re Yukon Denali has factory HID low beams so depending on time or day or how dark it is outside the low beams sometimes power on with the unlock button. The noise you’re hearing is likely coming from the HID ballast and bulb firing on and running. Usually only a noise noticeable while the engine is off.

 

[benjamminharris]

I never noticed it so much with the tail lights but would hear the noise you’re referring to with the headlights.

You’re Yukon Denali has factory HID low beams so depending on time or day or how dark it is outside the low beams sometimes power on with the unlock button. The noise you’re hearing is likely coming from the HID ballast and bulb firing on and running. Usually only a noise noticeable while the engine is off.

This has to be what the noise is. When I hit unlock on key fob and vehicle is not running is when I hear it. Headlights turn on.