F355 Stereo / Wiring question. | FerrariChat

F355 Stereo / Wiring question.

Discussion in '348/355' started by Badabing!, Apr 8, 2015.

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  1. Badabing!

    Badabing! Formula Junior

    Mar 30, 2014
    731
    NYC
    So I decided to try and install the OEM radio that I got from another FChatter a few months ago.

    Some background; my car has in it currently an Alpine TDA 7554 head unit with amp and CD changer in the frunk. I contacted FNA and they told me the factory configuration for my car was a Becker BE4372 head unit with no CD changer.

    I found a Ferrari branded BE4372 from a member here and took it to Becker Autosound where they confirmed functionality and built an iphone cable for it.

    It sat in the trunk for months until I found time Sunday to mess with it.

    Anyway, I pulled the Alpine out, plugged the connector into the Becker but it did not power up or show any signs of life.

    Does anyone know if the wiring for the plug would have had to be changed when the Alpine was installed?

    Certainly the amp and changer wires are aftermarket but the main harness appears to be OEM.

    I don't understand why it wouldn't turn on?
     
  2. GTSNJ

    GTSNJ Formula Junior

    Jan 18, 2015
    478
    Maybe they cut the wire upstream from the connector to tap power. Test it with a volt meter....
     
  3. Badabing!

    Badabing! Formula Junior

    Mar 30, 2014
    731
    NYC
    How do I know which wire is supposed to be the hot wire?
     
  4. PhilB

    PhilB Formula 3
    Owner Silver Subscribed

    Feb 17, 2004
    2,308
    Southern New Jersey Shore
    Full Name:
    Phil
    Maybe an obvious thing, but did you have the ignition turned to "accessory mode" when you tried powering up the new radio?

    I presume Becker Autosound could give you the mapping of what each port/wire on the back of the radio needs (which pair is power, which is left speaker, etc). Then you need to take a meter and see if the car side of the wire loom matches up.

    I'm located in the NYC area also, if you want to take a drive over I can help.
     
  5. 0.0.1.99

    0.0.1.99 Formula Junior

    Jan 14, 2012
    424
    Carolinas
    Full Name:
    Ken
    This should be an accurate wiring guide for a 355:

    Car Radio Battery Constant 12V+ Wire: Yellow
    Car Radio Accessory Switched 12V+ Wire: Red
    Car Radio Ground Wire: Black
    Car Radio Illumination Wire: N/A
    Car Radio Dimmer Wire: Orange
    Car Radio Antenna Trigger Wire: Blue

    Left Front Speaker Positive Wire (+): White
    Left Front Speaker Negative Wire (-): White/Black
    Right Front Speaker Positive Wire (+): Gray
    Right Front Speaker Negative Wire (-): Gray/Black
     
  6. 0.0.1.99

    0.0.1.99 Formula Junior

    Jan 14, 2012
    424
    Carolinas
    Full Name:
    Ken
    The Becker uses a European standard ISO harness for both the power and speaker connections. The speakers connection is usually brown and the power harness is usually black. On the power harness, check the red wire for switched power (via multimeter or test light) as others have said.

    After this, check the ground wire (black wire) but initially you should at least get ground from the antenna connection (enough for testing but check afterward).
     
  7. Badabing!

    Badabing! Formula Junior

    Mar 30, 2014
    731
    NYC
    Thanks for the info fellas. I did have the ignition on. I'm gonna take it back to Becker just to make sure it still works and then I will break out the multi meter

    Phil, thanks for the generous offer, I may have to take you up on that.

    I will report back.
     
  8. Badabing!

    Badabing! Formula Junior

    Mar 30, 2014
    731
    NYC
    Becker checked it again. The unit is A-OK. Must be an issue with the wiring harness.
     
  9. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    Check these wires with a meter:

    Car Radio Battery Constant 12V+ Wire: Yellow
    Car Radio Accessory Switched 12V+ Wire: Red
    Car Radio Ground Wire: Black

    If the yellow wire doesn't have +12V, check for a blown fuse somewhere. Did you turn off the battery before you started working on the wiring? Maybe it shorted when you were removing the old radio.

    - Tom
     
  10. Badabing!

    Badabing! Formula Junior

    Mar 30, 2014
    731
    NYC
    Anything is possible, but I put the old radio back in and it works.
     
  11. Loser

    Loser Formula Junior

    Apr 11, 2008
    791
    Gilroy, CA
    Full Name:
    Tom
    #11 Loser, Apr 15, 2015
    Last edited by a moderator: Sep 7, 2017
  12. taz355

    taz355 F1 Veteran
    Owner Silver Subscribed

    Feb 18, 2008
    6,007
    Indio Ca/ Alberta
    Full Name:
    Grant
    My factory radio has to be turned on and off. It stays on with the key out. This was the way the 99 were anyway. Kinda a pain they were not hooked to the accessory but constant power.
     
  13. Badabing!

    Badabing! Formula Junior

    Mar 30, 2014
    731
    NYC
    Fchatter ttanner has advised me that the Becker unit needs to be grounded to the cradle in order to power on.

    I had not yet slid the Becker unit into the dash (cradle) when I attempted to power up.

    I will try this and report.
     
  14. F_driver

    F_driver Formula Junior

    Mar 27, 2015
    428
    Belgium
    I have the same with my Becker radio, is there any solution for this?
     
  15. John Glen

    John Glen Formula Junior

    Dec 30, 2009
    494
    Victoria, B.C, Can.
    Full Name:
    John Glen Wesanko
    I would say your radio installation was incorrectly wired. The car radio 12 vdc constant was switched with the 12 vdc key switched power. I believe the 12 vdc constant power is just to maintain memory and clock type functions. The other "hot" wire from the car harness (indicated to be red) is also 12vdc but is "switched" through the ignition switch when actuated with the key. This is to prevent the chance of leaving the radio "on" and killing your battery. Easy to fix, just pull your radio and correct wiring.
     
  16. F_driver

    F_driver Formula Junior

    Mar 27, 2015
    428
    Belgium
    Thanks, I'm gonna have a look to it one of the next days.
     
  17. MNS

    MNS Rookie

    Jul 1, 2017
    2
    I have the same issue, even when the key is out the radio is still on.

    Can anyone help with this?
     
  18. Roth

    Roth Formula Junior

    Apr 1, 2016
    433
    Pepsi Generation
    Modern car stereos have two power inputs identifiable by color specific to the U.S. Most units have an internal battery and constant power connection to the car battery via a yellow wire from the back of the radio. There is also a red wire. This wire connects to the ACC via the key. When the key is turned to ACC or first position, the radio has power. Depending on the position of the on:eek:ff switch on the radio, the radio may be or or off. In your situation, the red wire is connected directly to the battery, hence constant power regardless of the key position which explain why the radio is on. Simply disconnect the red wire and reconnect it to the ACC wire. You can determine the ACC wire by testing with a D.C. Volt meter. Turn key to position one. Test and note all wires with 12v. Turn key off and note the voltage or absent thereof on those wires. The wire with zero volt is the key switched wire. That's the wire you connect the red wire from the radio to.

    As mention above after market car radios in the U.S. have a color code. The three important ones are yellow, red and black. The yellow wire goes to the battery positive terminal. The red one goes to the key switch(ACC). The black one is ground.(car chassis). While the metal housing of the radio casing is "grounded", it is not intended to be used as a ground connection without the black wire properly grounded.

    Note: "ground wire" in DC circuit is actually a negative wire. A return path for current flow and not the same as in AC circuit
     
    MNS likes this.
  19. Roth

    Roth Formula Junior

    Apr 1, 2016
    433
    Pepsi Generation

    If existing radio works, it implies the fises and wiring inside the car works as it should. The stereo shop determined the Becker unit works when they tested it. A logical problem is in the connection between the car and the Becker radio. Different brand uses different connection configuration. Don't assume they are interchangeable. The placing of wires within the connection housing matters. While the male and female pieces may fit physically, they may not electrically. You can actually damage the radio if the 12v wire mates to other wires not intended. The problem could simply be loose pin(s) within the connection housing. Post pictures of the wires from the back of the Becker radio. If it's a U.S. Model, the color code is etched in my head. If not, I bring out my enigma machine to decipher it. :)
     

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