348 spider instrument cluster blinks with right turn signal

This is a job for...


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...Qavion

 

Running for cover. This is a weird one.

Seems like the sort of thing caused by a ground issue. The flasher module and the gauges share a common ground terminal, "122" in the wiring diagrams, but I can't think of a specific fault which would produce this effect.

I don't know for sure where the grounds are. They may be behind the passenger footwell relay panel (some disassembly required). View behind the relay panel:

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Or are they the earths for the HVAC sensor system?

Do you know where your flasher module is, Eric? It should be near the driver's knee, mounted to the wheel arch, behind the carpet. If you pull the module out of the socket, do the lights still flash or not work at all?

I don't understand why the instrument lights only work with the the right flasher, not the left.

Sounds like a job for SuperMiro... @m.stojanovic

 

Do you have a LHD car or RHD car? Are you in the USA, Europe or elsewhere?

 

So the flasher module should be near your left knee.

 

The plug can be removed, but sometimes it can be a little sticky. Actually, I don't know if USA cars have an additional acoustic repeater (clicker module). The early F355's have an acoustic repeater.

Are there any other similar modules in that area? How many wires does that module have? It should have 4 or 5 wires on it:

Black x 2
Brown
White/black x 2

 

Are you getting 12volts power to fuse 10 with the lights on and the turn signal off? (key on)

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As we electrical folks say... If in doubt.. go to the last modification

Do you mean normal behaviour with switch operation?

At the wheel?

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Maybe just a bulb issue.

 

Perhaps you should give us more information/background:
1. Did the car already have this issue when you bought it?
2. If not, what work was done on the car immediately prior to occurrence of the issue?
3. Do your Parking Lights come "on" at first turn of the lights column switch?
4. Is your "K" relay clicking when the instrument lights are blinking with the right turn signals "on"?
5. Does the Parking Lights indicator light at the instrument cluster come "on" at first turn of the lights column switch?
6. Does the High Beam indicator light at the instrument cluster come "on" when you switch on the High Beams?

Ian,
If not already done in your revisions, you should correct your diagrams regarding relay "b" (the "K" relay). The diagram versions I have need the following corrections:
- On all relevant diagrams, relay "b" should show pins 87 and 87b (not 87a).
- On the "Instruments" diagrams (5, 5b and 5c), pin 87 of the relay "b" should be connected to fuse #10 (not pin "87a").
I attach the original wiring diagram for "External Lights" for your easy reference.
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Here's the PDF file. The above JPG file was too big and it automatically inserted itself into the message body (new feature of the forum?).

 

If you use the PDF file I posted (3.2MB), it is very clear and you can zoom it a lot. Of course, it will not be easy to read if printed on A4 paper. You should download the file and view it with Adobe Reader.

Otherwise, I'm sure Ian will provide you with his excellent diagrams (in GIF format) which you can zoom to smallest details and which are much easier to follow than the original Ferrari diagrams because Ian has coloured the links and also included many useful comments and details.

 

This could get complicated. I have the diagram above, but I also have a somewhat blurry copy of a USA-specific lights diagram. As far as I can see, fuse 10 is attached to 87a (or whatever the second contact is).

https://www.dropbox.com/t/CJs94OTMvSJJiw7A

Also, in some of my diagrams, I have the note: On some cars, this is a spare relay. Functions may have been moved to another relay.

Doesn't make much sense.

Anyway, I've changed them as you've recommended:

USA lights (incomplete)

https://www.dropbox.com/t/A5Qm06f2dIrNemf3

USA Instruments

https://www.dropbox.com/t/X8TXZJFwGI3Qupas

 

I can see that the relay "b" icon/graphics on the blur "Instruments USA" diagram you provided is that of the K-relay, same as what all other diagrams show. The output pins of the K-relay (or any other relay having the same function) are marked as 87 and 87b.

As to which of the two K-relay pins connects to which fuses, it does not really matter as both pins function in the same way - both are disconnected from pin 30 when the relay is "off" and both are connected to pin 30 when the relay is "on". The "special" part of the function of this relay is that, when the relay is "off" the pins 87 and 87b are separated from each other. Pins 87 and 87 on the standard 5-pin relays do not separate from each other when the relay is "off".

Since all other diagrams that show the relay "b" show pin 87 going to fuse #10 (including the "Lights USA" diagram), I think your amendment on the "Instruments USA" diagram is in order. Please provide link to your "USA Lights" diagram when complete.

 

When the LED on these fuses lights-up it means the fuse is blown.

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Not sure what you mean. The Instrument USA link in my last post shows fuse 10 on contact 87.