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Visteon OA Fiat Stilo car radio no FM reception

By on September 7, 2015
fiat radio repair

 

 

 

 

 

 

 

Hi good people, here I put together a new car radio repair guide for the:

Car type: Fiat Stilo

Radio Manufacturer: Visteon

Visteon part no.:2FCF-18C838-AE
Serial No.: M029233
Model: OA
Fiat part number: 735296994

 

The customer brought to me this equipment with no FM reception. The radio cannot receive FM radio station signals or it is too weak. The first problem and the biggest one is, does this type of audio equipment is bond to the cars ECU (Electronic Control Unit) and if you wish to put it on your service bench and try to power on then you got this message:


1.5

NO CAN NETWORK means does the radio is out of his vehicle and cannot communicate with the host ECU.The radio must be connected to the CAN BUS communication rail to the host computer in the car. If you try to put this type of car radio into another car, I mean into another Fiat Stilo than the radio will ask for a code.

If you can not start the equipment on your bench how can you repair or make a diagnostic?

Here are a few solution:

  1. you can buy a CAN BUS simulator for this type of radio
  2. you can repair it until it is connected to the car
  3. you can make diagnostic through a car diagnostic tool but you can not know which part is shorten or open, or what part you have to change…
  4. almost every car radio like this have a so called DIAGNOSTIC MENU

I took the DIAGNOSTIC MENU option.
By power on the radio and pressing but hold the buttons 3 and 6 you will go directly into the diagnostic menu. After that, you can press the numbers from 1 to 6. Every number pressed opens a diagnostic option with a result.

Let us see what type of option we have:

no antenna connected

No antenna connected

3

4

5

6

This is the voltage of the input signal from the antenna

 You can leave the diagnostic menu by pressing the button AUDIO.

Let us see what the problem is.

  1. I recognized a ANTENNA OPEN CCT
  2. Short circuit failed
  3. Signal strength very weak, about 0.3V

This entire test is done until the antenna was connected to the radio.

There are 2 reason for a low input voltage and antenna open cct.

  1. the tune chip is bad
  2. Somewhere the wiring is broken between the radio and the antenna.

The problem was a broken antenna socket soldering on the pcb. Otherwise, this type of radio has a common problem with the tuner chip, which is the TEA6842H.

car fm radio repair

This is the pcb of the car radio.

After the fresh solder, let us see what the new diagnostic measurement show:

fm signal strength

This is much better then before. Can you remember the measurement before?

It was 0.3v but now we have a 1v measurement. It is still low but I am under the earth in my service center and here are very weak any radio signals. The reading should be between 1.6v and 3v. I sent back to the customer the radio and asked him for the radio condition in his car. He told me, he could not remember when he could hear the last time so nice and clean music from his famous radio station like now again.

Here is the radio pin out if somebody need this:

9

So, mission accomplished.

I hope this will help someone to get a new knowledge and a new repairing experience.

christian

 

 

 

 

 

 

This article was prepared for you by Christian Robert Adzic from Novi Knezevac-Serbia.

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Note: You can check his previous post in the below link:

https://www.jestineyong.com/laptop-keyboard-teardown/

 

 

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26 Comments

  1. Gabriel

    September 7, 2015 at 4:40 pm

    Good job. Thanks for sharing with us.

    Likes(2)Dislikes(0)
  2. Robert Calk

    September 7, 2015 at 5:41 pm

    Good job, Chris. Thanks for the article.

    Likes(0)Dislikes(0)
  3. Yogesh Panchal

    September 7, 2015 at 6:30 pm

    congratulations! for fix.

    Likes(1)Dislikes(0)
  4. Anthony

    September 7, 2015 at 6:35 pm

    Nice repair Chris and I too am grateful for you sharing the repair article here.

    Likes(0)Dislikes(0)
  5. biruk aweke

    September 7, 2015 at 7:39 pm

    Very great repair & explanation. keep up.

    Likes(0)Dislikes(0)
  6. Corriete

    September 7, 2015 at 8:12 pm

    alright! thanks for al the info sir. great job.

    Likes(1)Dislikes(0)
  7. Mark

    September 7, 2015 at 9:10 pm

    Hey Chris,
    Thanks for the step by step instructions. I didn't realise that there were ways to access the diagnostic system without CANBUS connected.
    Where did you find your schematics and data instructions?
    I usually gain live data through a scan tool, but haven't tried with the component out of the vehicle.
    Thanks
    Mark

    Likes(0)Dislikes(2)
  8. Mark Tembo

    September 7, 2015 at 10:15 pm

    Thanks for the article. I enjoyed it!

    Likes(0)Dislikes(0)
  9. Debirt Maynard

    September 7, 2015 at 11:09 pm

    Excellent, Great job.

    Likes(0)Dislikes(0)
  10. Merlin Marquardt

    September 7, 2015 at 11:20 pm

    Very interesting repair.

    Likes(0)Dislikes(0)
  11. egidio

    September 7, 2015 at 11:22 pm

    if you gdaj repaired amateur station ICOM IC751 to display all the works , the problem is PLL.sliši is noise -free signal , ramunit a new programmed to please a few words if you help me

    Likes(0)Dislikes(0)
    • Chris

      September 13, 2015 at 5:06 am

      egidio:
      thanks for supporting my article.
      Sorry but I newer have any contact to that ICOM IC751 🙁

      Likes(1)Dislikes(0)
  12. albert

    September 7, 2015 at 11:40 pm

    Excellent article, good job!!

    Likes(0)Dislikes(0)
  13. Humberto

    September 8, 2015 at 12:49 am

    Hi Chris, I really enjoy reading your articles which have good explanations and photos.

    Likes(0)Dislikes(0)
  14. Gary Gemmell

    September 8, 2015 at 3:12 am

    Great repair Christian , your repair articles are always unusual and very interesting to me! I have just repaired a similar radio in my own Ford Streetka - I hate those built in radios with security codes - battery goes flat you lose code.

    Likes(0)Dislikes(2)
  15. Ulises Aguilar Pazzani

    September 8, 2015 at 11:40 am

    Great repair it needs patience to work on electronics great sir

    Likes(0)Dislikes(0)
  16. jim asch

    September 8, 2015 at 11:49 am

    thanks much it is good information, it helped me out

    Likes(1)Dislikes(0)
  17. tyaso mussa

    September 8, 2015 at 12:13 pm

    nice job i learn somethng new and thanks for sharing with us!

    Likes(2)Dislikes(0)
  18. Mike

    September 9, 2015 at 1:07 pm

    In the fault menu, the message "short circuit- fail" you have described it as antenna open circuit, should that not be "antenna short circuit"?

    Cheers ......... Mike B

    Likes(1)Dislikes(0)
    • Chris

      September 26, 2015 at 9:22 pm

      Sorry Mike because I'm late to answer to your question.
      First of all thanks for supporting my article.
      You alright, I was confused too with this option, because for me would this be
      a logical description does the antenna should be tested for a short circuit but
      after I checked a lot of documents and meet peoples from the same branches I
      got two possibilities:
      1. this message should show if the antenna is shorted out somewhere
      2. if the antenna would be tested from the cpu and the antenna wiring have an open circuit then could be does the message shows up "short circuit-fail".
      As I said, I was confused with this info. Some people said its a test for a short circuit other said its the test for open circuit. The docs said it should show if the antenna circuit is open or closed.
      I decide to test this function. That was on another radio some time ago.
      When I connected antenna which circuit was closed but not shorted I got a
      message "short circuit-pass" when I disconnected then I got "short circuit-fail". So the circuit was open, what means no antenna connected.
      I never saw any original docs for this type of radio where all this functions
      was described.
      Whatever this function does I can test if the antenna circuit is open or closed. This is a good starting point for trouble shutting.
      I appreciate your question.
      My best regards.

      Likes(0)Dislikes(0)
  19. mustabz

    September 22, 2015 at 1:23 pm

    all i can say is WoooW!!!!!!
    way to go. +1'd you

    Likes(0)Dislikes(0)
  20. Frank Codrington

    September 29, 2015 at 10:47 am

    what can I do about my Panasonic 5CD changer and stereo--I am not getting any reception on my FM band. I tried everything with the remote. could programming on the remote be the problem?

    Likes(0)Dislikes(0)
  21. Slavko

    February 22, 2016 at 1:28 am

    Hi Chris,I have same type car audio loosing FM(AM too)reception with messages: Antenna gnd short and short circuit-fail.Have you some advice?
    Signal strength is from 0.4V to 0.7V when bad and 1.6V to 4.4V with good reception.Have you some advice?

    Likes(0)Dislikes(0)
  22. Chris

    April 28, 2016 at 5:52 am

    Slavko, sorry because I'm just now realized your message.
    I Thik it could be somewhere in the wiring of the antenna a shorten to each other or to the car metal parts.
    But, it could be a bad tuner chip too as I wrote in my article.
    Without diagnostic it is really hard to say what could be the problem... 🙁
    You are well come.

    Likes(0)Dislikes(0)
  23. Jesus Davis

    July 28, 2017 at 12:14 am

    Hello Chris, very good this post!!
    I have a model more recent this radio, I would like do auxin across fm turner option, but I havent schematics. Do you have a solution in this case, my model is without auxin back pinout, and the phone input is mono!

    Thanks,

    Jesus

    Likes(0)Dislikes(0)
  24. Masan

    November 15, 2018 at 4:50 pm

    Hello Chris,
    I have bought a genuine used radio for my Fiat Bravo 2009.
    When I connect all the jacks I am getting the error no can network.
    Any idea about the solution?
    Can I maybe connect it to the CAN network of the car somehow?
    Thanks.

    Likes(0)Dislikes(0)

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