Speaker hiss when car is off?

[MikeyTsi]

Pioneer Avic-Z130BT, stock amplifier with an adapter harness (amp turn-on lead and RCA cables).

I've got an interesting problem that has come up after installing a new in-dash in my car over the weekend.

If I turn off the car, then the passenger door is opened and closed, it sounds like the amplifier kicks back on, and I hear a hiss from the speakers (like the radio is tuned to a frequency that doesn't have a station). If I put the key back in and turn to acc or on to get the dash unit to start booting, the hissing turns back off and I can take the key back out and exit the vehicle. This does not happen on the driver's side.

Does anyone have any suggestions on what might cause this? It really is the strangest thing.

Also looking for the VSS wire and a good reverse wire so I can patch the stereo in to those.

Now the iPod cable isn't working right; it connects and increments the timer like it's playing back, but it's not producing any sound on that. I'm guessing I've got a bad ground or something odd with a wire, there's some hacky shit in there from the PO that I should probably properly pull out anyway.

 

[AnthonyP]

Do you have any shorts in the wiring between the door and the body of the car? Check for proper grounds as well.

 

[DSM1G90]

DSM vehicles came with stock radios that can't be turned off dead cold like other car radios.

Thus, in the DC line circuit to the radio line, is a capacitor that actually "drains" the 12v input current down gradually so it doesn't harm the radio....which in a way is more healthier for any electronic device to have the line current 'conditioned' - like gradual turn on and off instead of suddenly on and sudden shutdown cold like a light bulb on a wall switch.

This is a common occurance when one puts aftermarket radios in DSM's on the stock radio 12v line feed.

You're okey...if you can tolerate this occurance.

good luck - DSM

 

[MikeyTsi]

That doesn't seem to explain my issue, I can come back out to the car several hours after turning it off, and if I open the passenger door and then close it, the sound will start.

Anyway, I think I fixed it. I'd thought it might be a speaker problem, because I discovered if I disturbed the speaker (hit it), it would pop and make noise. I thought it was a speaker issue for a while, but I pulled the radio again, extended and re-grounded all the wires I needed to send to ground and pulled out a bunch of dumbshit wiring from a previous owner, and now the problem appears to be gone, as well as my iPod working again. I guess I'll give it a few days and see if it reappears.

Anyway, does anyone know where the VSS wire is? I need to patch in to that for the stereo, it uses it to enhance the GPS/NAV functions.

 

[DSM1G90]

pulled out a bunch of dumbshit wiring from a previous owner,

.. don't you just hate finding 'spider web wiring' when someone else has the idea on knowing how to do their own wiring?

Amazing that the car doesn't catch on fire with some of the 'spider web wiring' jobs that I've seen ...

Just on the ground issue: make certain that you have what needs to be grounded to where, for there is chassis ground and common ground .. the two don't mix very well - keep them separate. Speaker wiring would run to chassis ground of the radio, not to common ground. Seen that a few times ....

-DSM

 

[MikeyTsi]

Well, there's actually just the one ground for the stereo, but I had to ground the e-brake wire and another re-pinned line to do the e-brake bypass on the unit. I'm still using the stock amp with an adapter harness, so it's still being ground through the factory system.

I should take a picture of the crap I pulled out. There's still a bunch of taps on the factory radio wiring (it would be worse to remove them and re-cover the wire than just leave them), and there was some weird-ass power line going to the fusebox on the driver's side that I pulled. It looks like he was tapping off of the speaker wiring for a line-level output and then running that to RCA for an amp or something. And I still need to pull out a U-Haul harness that was spliced in to my rear lights.

 

[96pos dsm]

mine did same thing... but only after i installed my walbro 255 for some reason???

 

[Zdrummer15]

I noticed a hiss like you described in a Chevy Impala that my mom drives. It has done it since it was purchased brand new. From what I can tell it is fairly common in cars with an external amp. In many cars this amp will turn on when the door is opened because it will be needed to power the speakers to play chimes in the car such as the one that plays if you leave your keys in the ignition or your headlights on. I'm not 100% positive that this is the case in DSM's, but that is the reason for the hiss in some other cars.

 

[MikeyTsi]

No, that's not it. As I mentioned, it looks like I fixed it by re-doing my grounds and ripping out some dumbshit wiring.