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I cannot get my head unit to turn on - Car Audio & Video

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Hi. May i know the brand and model of your head unit?

Posted on Aug 01, 2010

  • 12 more comments 
  • dgkingford Aug 01, 2010

    the unit is a kdc-pm339

  • dgkingford Aug 01, 2010

    it is a kdc-mp339

  • dgkingford Aug 01, 2010

    my telephone number is: 0439593034 can you ring me on this number please?

  • Angelito Rabago
    Angelito Rabago Aug 01, 2010

    Thanks forthe quick response. Problem could be general wiring of the headunit going to the main source. Have you check you fuze box if the fuse forthe radio is ok? i provided you link where there is basic instrcution on how to connect the power of the unit to the main. Please click here.



    All the best!

  • dgkingford Aug 01, 2010

    i have done all that and there is power getting to the unit up to the faceplate but the faceplate will not turn on

  • Angelito Rabago
    Angelito Rabago Aug 01, 2010

    I see. I got that problem also with my Pioneer DEH 7450. There could be a problem somewhere between the metal strips of the face plate going to the head unit. Mine is, if you press down where the metal strips are located i am getting the graphics onthe screen. So what i did is, i adjust the metal strips that would reached to the contact ofthe head unit. After doing this, problem is solved. if you are not getting any response when you press donw the face plate then there could be a problem with the face plate itself. By the way, how old is the unit?

  • dgkingford Aug 01, 2010

    about 4-5 years old i think as it was my brother who installed the unit and we had it working friday afternoon up until my father put the front drivers seat in but now it will not work

  • dgkingford Aug 01, 2010

    i tried your suggestion but it did not work even then so i am at a loss as to what is wrong with the unit

  • Angelito Rabago
    Angelito Rabago Aug 01, 2010

    I see. Your father might accidentally bumped the face plate that caused mis-alignment to the main unit. Try my suggestion first for this happened to Pioneer also. This is a common problem with head units with detachable face plate.

  • Angelito Rabago
    Angelito Rabago Aug 01, 2010

    changing the car seats are not actually related to the issue. There is no reset button on the unit. So i guess you need to have it checked to the manufacturers technician. Since unit is turning on and the issue only is there is no response from the face plate.

  • dgkingford Aug 01, 2010

    there is power getting to the unit but the faceplate is what turns on the unit and there is no power coming through the faceplate as the areal would be going up/down if the unit was switching on

  • Angelito Rabago
    Angelito Rabago Aug 01, 2010

    try adjusting the power strips from the face plate by using a needle and gently pull the strips in an outward direction. Make sure that the strips are kept aligned when you pulled it. then test again.

  • dgkingford Aug 01, 2010

    it had connctors and i tried your suggsetion and not a whisper of life in the faceplate

  • Angelito Rabago
    Angelito Rabago Aug 01, 2010

    I guess you need to bring the unit to a repair electrical technician and have the face plate checked. There could be something wrong or is loose inside the face plate or possbile blown out IC chip that needs replacement or for possbile re-alignment.

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Details below.

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There are several ways to get your amplifier to turn on and off remotely even if your head unit does not have a remote turn on wire. The cheap and easy way is to run the amplifier's remote terminal off of a switched accessory wire. This is the wire that your head unit uses. It is only powered when the key is in the accessory or run position of the ignition switch. When you shut the car off the wire loses power and the head unit and amplifier will both turn off. Your amp will be on when your car is on and off when you car is off. If you don't want the amplifier to always be on when the car is on you could wire a simple switch inline with this new remote wire. Normally you would leave it on so that it turns on when the head unit is on. But if you wanted to turn the amplifier off you could flip the switch to off which would stop the flow of 12 volts to the amplifier's remote turn on terminal.

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Since you've been trying things for so long, you may not mind another, unless you've tried it already.You'll need someone to help you.

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