Only one taillight blinks when locking

I trust you checked the obvious....right?

 

Right then. Synthetic fluid I trust.

Front lights blink?
Did you pull the connectors and check for corrosion?
Perhaps corrosion in the bulb seat?
Maybe have a spotter check the lights as you hit the brakes and turn the blinkers on (with that new fluid and all)

BTW, arm = 2 chirps...or 4?

 

Dot 4 brake fluid ....... right
Shake the wire, check connectors ?
I won't bring up the bulb thing.

 

This is starting to make more sense. The alarm system definitely doesn't have inputs into individual lights. No doubt the left hand turn side repeater(s) are also blinking (Do you have a US car or a Euro car?)

The turn relay has two outputs for turn indication (left and right). The outputs then go to electrical splices which send the signal to all the lamps on the respective side (including the instrument panel turn indicators). The alarm system will feed into these left and right turn splices.

The alarm system may mimic the turn relay, in which case there will be two separate (light) outputs from the alarm module (for left and right hand lights). In this case, there may be a faulty alarm module or faulty wiring from the module to the right hand turn splice (sorry, I've never been able to find these splices on my car).

If there was only one output from the alarm module to both the left and right turn signal splices, I think this would generate all sorts of unnecessary complexity (external diodes would have to be added to stop the left and right turn signals interfering with each other during normal turn operations). As always, I stand to be corrected

If your car's wiring is in generally good condition, I would suspect the alarm module itself as being faulty. Are the plug/s secure on the module? Are there any bent pins on the module plug/s?

I don't suppose anyone has a pinout for the module? I see pins 3 and 12 are the inputs from the manual unlock switches on the centre console.

 

To add to Ian's post, here are two examples of wiring aftermarket alarm modules. The first has two outputs (for left and right indicators), the second has one output and uses two diodes to connect to the left and right indicator lines. If the first type is in the 355, the fault could be inside the module; if second, one of the diodes might be blown.
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Interesting, thanks, Miroljub In this case, let's hope the F355 has diodes (they'd be a whole lot cheaper to replace/repair than a module)

Unfortunately, checking the diodes (if fitted) involves finding them or at least identifying the pins/sockets on the alarm module. Looking at online photos of the alarm module, there doesn't appear to be any stickers on the outside showing pinouts.

 

St4rk, I don't know if you're still interested, but after more hours looking at the wiring diagrams in the workshop manuals (1994 Euro-spec car), I discovered on Figure 7, that the anti-theft module has separate outputs to the left and right turn indicators.

Pin 6 (blue wire) goes to splice 30044 (location unknown), that is, the splice for the right hand turn indicators (front, side, rear).

Pin 5 (brown wire) goes to splice 30043 (location also unknown), the splice for the left hand turn indicators.

In theory, you can check the wiring by looking for continuity between pin 6 and, say the right hand rear lamp holder plug (blue wire on the plug). If you have open circuit or high resistance, then the wiring is faulty. If you have continuity (a few milliohms / almost zero resistance) the wiring is ok. This means the anti-theft module is faulty.

If there is no blue wire on pin 6, then your car is wired differently

Here's the sum of the data I was able to pick up from the rest of the wiring diagrams:

Pinout for anti-theft module....

1 RV (red/green) to splice 30038 (power for hazard light circuit in turn relay) USA cars may differ)
2 N/A (not used?)
3 MV (brown/green) centre console door lock switch input
4 LN (blue/black) forward luggage compartment lock input
5 M (brown) to/from splice 30043 (output signal to left hand turn lights)
6 L (blue) 63044 (output signal to right hand turn lights)
7 R (red) power from battery via splice 30029
8 N/A
9 N/A
10 N (black) Major earth 70092 (location unknown, but is the earth for the right hand turn side repeater lamp, console switch backlight (round buttons), etc). Ref Fig 8.
11 VB (green/white) to via splice 30020 (power from ignition, fuse 25 (fuse 24 on later cars) "AC System" fuse)
12 ZB (purple/white) from centre console door unlock switch
13 N/A
14 BN (white/black) to splice 30017 (Refer Fig 10, right hand/lower side). Related to courtesy lamps, door open switches, window control, etc.
15 HN (grey/black) from switch on engine cover (via plug 41025)

Hope this is of some help to the Ferrari community.

Cheers
Ian.

 

P.S. (Correction)

Sorry, for pin 6, I meant to say:

"6. L (blue) wire to splice *30044* (output signal to right hand turn lights)"

 

I get no chirps.

 

Lost your chirper?

I couldn't find the pin for the siren, but, apparently there are rechargable NiCad batteries in the sirens which go kaput... Google was my friend.

http://www.ferrarichat.com/forum/348-355-sponsored-bradan/364614-355-alarm-siren-replacement.html

Seems to be a common Ferrari part:

http://www.ferrarichat.com/forum/360-430-sponsored-yellow-compass-group/302252-conspiracy-no-appears-alternative-alarm-module-2.html#post140042040

There are various solutions:
Buy a whole new Ferrari alarm siren and save time and effort (very expensive option U$400 plus). I think the newer ones are supposed to have better batteries.
Buy a GM replacement siren (plugs not compatible, so lots of time and effort, unless you can find an adaptor). There is a short adaptor harness on the Ferrari OEM setup, but you may need a different adaptor.
Buy replacement internal siren batteries (lots of time and effort)
Fit an external replacement battery (not sure what you do with the (possibly) leaking original batteries)
e.g. Dynamic Technology Group

Regarding prices of sirens in the USA:
(This is for the 5.2, I couldn't find a listing for the 2.7 (1995))

ELECTRICAL BOARDS AND DEVICES - FRONT PART - Ricambi America, Inc.

Cheers

 

I believe it's behind one of the seats, behind a leather covered panel. Perhaps someone can confirm this (The engine ECU is under the opposite cover).

ANTI-THEFT ELECTRICAL BOARDS AND DEVICES - Ricambi America, Inc.

Hopefully you won't have to remove the cover (riveted on) to access the plug/s

Cheers

 

Gents... does anyone know what the 3 electrical wires on the siren are for? There is a red, black and green wire. I assume black is the earth. Ferrari use both green and red wires for power, so I'm not sure which wire is the trigger signal from the alarm module.

Just two missing pieces from my composite 2.7 alarm diagram... i.e. siren and dashboard LED. Perhaps someone has a photo of the wiring on the alarm module connector, showing some of the wire colours?

Alarm System Schematic


Thanks
Cheers,