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WH Front Speakers

Discussion in 'Electrical Wiring / Questions' started by PhD, Apr 10, 2009.

  1. PhD

    PhD New Member

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    Howdy,

    Wasnt sure if to post in electrical, or in audio, but...

    Ive recently installed a new head unit, using a pioneer to iso to VT harness.
    The problem that has occured is, the front left door speaker doesnt seem to output anything now - however the front left tweeter still does..
    How is the wiring set up for the front speakers?

    Does it go from the back of the stereo to a couple of plugs, which then go to each speaker? Does it go from the stereo to some kind of crossover unit? (if so where is it) or do they wire directly from the stereo.. because i noticed it cut out when i was packing the wires back into the dash when seating the HU in.. somehow somewhere, where the wires split off to the tweeter and to the speaker - it must have come loose.. but where that is i dont know ..

    I find it really strange that the left tweeter works but not the door speaker.. im in the middle of removing the glovebox to try and trace the wires.. and see where I potentially have "jerked" the loom in the wrong way.

    Has anyone ever had any experience with the stock loom?
    If i cant find anything - ill take the door trim off and check the wiring there.. its wierd though because the passenger door was closed when the stereo was put in...

    Also - just a 2nd question, the back of the stock stereo had a couple plugs im not familiar of what they do...

    The main loom, thats fine - that plugs into everything on the pioneer plug (minus the steering controls and up/down for the antenna)

    But whats left over is, the stacker plug, a plug that looks like an aerial plug but smaller and another plug that has 7 wires going into it that plugs in higher up on the back of the head unit.. not sure what they do.. are they the steering control wires? there is 2 orange/black wires, a black/white wire, 2 brown (or might be purple - its too dark to tell) and 2 blue wires... still cant work out what the "smaller" areial plug is though..

    Any help would be greatly appreciated..
     
  2. Calaber

    Calaber Nil Bastardo Carborundum

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    The wiring to the tweeters is spliced off the wiring to the front door speakers for each side. I don't think there is any crossover installed - the speaker wiring is pretty basic. The problem with your door speaker could be a broken or disconnected wire within the flexible section between the pillar and the door. It could also be a faulty speaker. I had the wiring break on me on one of my cars, the speaker would work with the door shut, but not with the door open. You could try that test first.

    To check the circuit, remove the door trim and try hooking a different speaker to the wiring. If it works, your speaker is the culprit. If not, check the wiring back to the player, starting inside the door and working from there.
     
  3. PhD

    PhD New Member

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    at what point are they spliced off though - i guess thats what im trying to locate, because it seems wierd that just tugging the loom disconnected something.. i would have thought there would be a bunch of clips and plugs holding the loom in place - its not like i pulled that hard on the loom.. unless it was purely coincedental..

    Tomorrow - when there is more light ill be able to see what im doing ..
    and work out firstly how to get the glovebox off.. (stuck at trying to remove the lid at the moment)..
     
  4. PhD

    PhD New Member

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    Well, it must have been pure coincidence - the speaker was blown, must have been the straw that broke the camel's back, the extra wattage must have just popped it.

    Off to pick up some 6" speakers.. :)

    Still havent worked out what the other plugs on the back of the stock head unit are...
     
  5. -Junior-

    -Junior- New Member

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    Is it a mystro (spelling) system? They had the second plug for the amp in the rear to run the subs on the parcel tray.
     
  6. PhD

    PhD New Member

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    If i were able to take a pic of it id post it, the amp and subs still function with just the normal white plug connected using the vt-iso-iso-pioneer plug..
    But the 5 plugs that go into the stock HU are:

    1) the main loom connector (with the white conenctor) (going to the pioneer plug via the adapters)
    2) the round stacker plug - now unplugged
    3) a standard aerial plug - plugged into the standard aerial plug on the pioneer

    4) a 7 wire connecter, now unplugged
    5) what looks to be an aerial plug, but about 1/2 the size (in diameter) and 1/2 cm shorter.

    having those 2 unconnected seem to not make any difference to the stereo/output.

    Could the 2nd aerial type plug be for some kind of secondary antenna, and that other plug be for something to do with a handsfree unit or the steering controls? Ive got a copy of the service manual for a vt, but its a different head unit, and not sure if it uses the same wiring schematic.

    - But, got a set of kenwood 6 1/2" speakers for all 4 doors, however i think i may return them as it seems i can put in a much deeper speaker than the one I got.. (the stock speaker is about 1/2 inch deeper than these kenwoods..)
     
  7. PhD

    PhD New Member

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    ah ha!

    Just finished grabbing the tech cd..
    and the whole paragraph in the audio section explains it:

    The other antenna plug - looks to be whats called a "diversity antenna"

    So i guess i cant use this now with an aftermarket head unit... oh well - at least its put my mind at ease knowing what they are now.
     
    Last edited: Apr 11, 2009
  8. galahs

    galahs Member

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    I am not sure if that diversity antenna is that good.

    I have one in my VT Commodore S and the reception is a lot weaker and crackles a bit in places that don't have a really strong signal.

    I have never had a problem with that in VT or other Commodores that don't have the extra antenna.


    Though maybe it is just that my diversity antenna isn't grounded properly. :whistling
     

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