Humming noise coming from head unit.. and its not the normal prob..

[97ka-t]

Sounds like interferance. Still loud when car is off. All grounds checked. All positive connections/RCA's etc checked. Any other suggestions? Think it could be an electrical malfunction in the head unit?

[PoorManQ45]

Hmm.. It still occurs when the car is off? Do you mean like with the key out of the ignition, or just turned to ACC?

Does the HU itself make the noise. If you have the volume all the way down can you hear the noise? Or is it coming from the speakers?

Does your HU have a CD player? If so, is the sound similar to a CD-rom drive on a computer(whirring). If so then the CD player is failing.

[97ka-t]

Hmm.. It still occurs when the car is off? Do you mean like with the key out of the ignition, or just turned to ACC?

Does the HU itself make the noise. If you have the volume all the way down can you hear the noise? Or is it coming from the speakers?

Does your HU have a CD player? If so, is the sound similar to a CD-rom drive on a computer(whirring). If so then the CD player is failing.

With the key in the ignition ACC/ON, as long as they head unit is on, with the volume at ONE or above it will hum. It does not hum @ 0. The head unit does not put out power to the speakers (unsure why), I have my speakers powered via RCA by a 500/4 Phoenix Gold amp. I plugged a speaker into one of the speaker outputs of the head unit, and it hummed, with no volume/without actually playing the music that was playing on the CD. All humming- throughout the volume 1-20+ etc etc. Not a whirring, it sounds like interference, but I have no idea how it can be...

[PoorManQ45]

Hmm.. i've never actually heard of this problem.

What HU are you using? I might be able to find another occurance of this problem