F355 Radio wiring help needed

I may have difficulty with this one. My yellow wires run to the right, not to the left. Also, I don't have a US/Can/Jap car, so no OBD port. In hindsight, you probably should have posted this message thread on the F355 forum where you probably get more F355 owner attention. The wire is hard to see in the photo. What colour is it? I only recall having 3 yellow wires ziptied together. Two of the 3 were spliced/heatshrunk together before reaching the filter.

i.e. shown in the diagram:

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I've changed the yellow wire colour to "gold" to make it easier to see.

 

The wiring hookup for plug 59014 is shown in the 5.2 diagram I posted. There should be 7 wires in total.

Violet, green, grey (with red stripe), violet (with black stripe), grey, black and red.
green and violet (with black stripe) are the left hand speaker wires (wiring goes to the tweeter first).
Grey (with red stripe) is live battery power
Violet and grey are right hand speaker wires (wiring goes to the tweeter first)
Black is ground.
Red is power for the antenna preamp (possibly under the RH air outlet on top of the dash)

It looks like you're missing the black ground wire.... unless that "speaker wire" in your hand is a ground.

 

Another possibility is that your car was wired up differently to mine. Since the Sony unit is designed to accept ACCessory power on pin 2 (of the Sony 18 pin plug), you may want to check to see any of those yellow wires have accessory power (i.e. not powered at all times).

Look for a yellow wire (radio specific) coming from your steering column connector.

 

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The accessory wiring of your ignition switch should go to a rectangular plug at the base of your steering column leather shroud. On the car side of the plug (not the steering wheel side), there should be some yellow (with black stripe) wires. See USA version:



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See GN (yellow/black). If you could splice a wire onto one of these yellow/black wires and feed it to pin 2, that would be perfect.

I'll modify my diagram shortly...

 

Hmmm..... Possibly. Blue wires on the F355 can be key power wires (RUN, not ACC)

 

Disregard my possible modifications. It's getting too complicated. You've chosen to rewire the unused plug into the circuit. I don't know if the unused plug would need live battery power or Acc power. Even though the plug is not used, I don't know if that would cause complications for future owners.

 

Just had another look at your photo:

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The blue wire may actually be a Ferrari light blue wire ("A" Italian colour code). This colour can be associated with ACCessory power. It depends where the wire is spliced. There is a light blue wire on the steering wheel side of the steering column connector.

 

Here's how I would have wired up your car to match the Sony diagrams:

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The ACC power source would have come from the ignition lock wiring (car side).

 

(EDIT: disregard my post, I understand now)

You are just missing the RF Choke/Fuseholder.

I'm not sure you would get that from Ferrari, but I just noticed that the link I provided earlier to the Sony adaptor does show the RF choke/filter holder.

https://www.tedss.com/2024000111?srsltid=AfmBOoplkM6azF4iNBo7vm5I82EiR3HahAjfZ8faJdHw_WAJkLLw1UHg



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I don't see the plugs though.

 

Nope. Not on my car. Here is my wiring diagram (OEM):

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Hard to see but live power comes from plug 59014 (pin 3) on a yellow wire. It arrives at a splice (the one in the photo you labelled "Where does it go"). The splice feeds:
1) the RF choke/fusebox (RH wire in the photo of the opened black box)
2) a second splice which feeds the unused connector and the 3 amp fuse. The 3 amp fuse feeds pin 2 of the Sony unit.

The yellow wire going to the black box goes through the choke and fuse (although I don't know which comes first, I didn't check) and filtered power comes out of on the other yellow wire to pin 1 of the Sony unit.

When you fit the choke/fuse box, splice the yellow wires into the circuit. I wouldn't solder the wires to the box internally. There are some giant solder blobs holding the wires in. You may melt something you're not supposed to melt if you soldered the yellow wires internally.

 

I posted this magnified diagram earlier (of my wiring):

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G = giallo = yellow

For some reason, both pins 1 & 2 receive live battery power.... except the pin 1 voltage seems to carry a lot more current and is filtered. All the power comes from frunk fuse 4 on my car.

 

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Correct.

I just wish I knew why both pins (1 & 2) get live battery power. Sony didn’t design it this way, but your wiring seems to match mine. There seems to be no wires heading towards the ignition lock. Did you inspect the plug wiring at the base of the steering column? i.e. the plug with really thick wires, not the plug with wires related to wipers/washers.
Having both pins live means that, in theory, the radio won’t turn off when you turn off the car.

Have you thought about installing bullet connectors on the yellow wires to allow easier modification?

I’ll play around with my radio later today to see if I can get it to work. It may just need turning on from the front panel.

 

TBH, I don’t think it matters. There are no diodes or transistors in there.

 

Looks good. Having said that, I didn't check the wiring going to the unused plug, but as long as the wire colours matched, it should be ok.

Would it be possible for you to take a photo of the location of the USA choke/fuse mounting position for future reference? Or is it buried too deeply in the dash?