ACOUSTIC REPEATER 157498

As part of a winter re-vamp of my 355 I recently undertook an extensive LED upgrade.

However when it came to the amber turn signals I hit a snag.. Despite using 21W LED with in built resistors, the dreaded hyperflash haunted me.

Spurred on by a similar mod idea to a 550, I pulled my Hazard/turn signal flasher in my 96 AUDM 5.2 spyder Ass No 238? to see what I might be up against..

https://www.ferrarichat.com/forum/threads/550-led-light-conversion.362438/page-3

To my surprise I saw that it was only a 4 pin relay..
Furthermore it looked quite flimsy.. looking more like a signal device..
No big metallic silver shunt.. rather a ?? small resistor instead in its place..

Am I missing something here.. Is there another relay that controls the Hazards/flashers..?
Im puzzled beacuse when I pull this relay neither the turn signals or hazzards work.. and when I plug it back in it 'clicks' when both the turn signals and/or hazards are are activated.

So im a bit stumped as to how to do this mod..
I know I have to put a diode in place of of the the resistor to provide a voltage drop.. or put a smaller resistor in place..? But I don't even know what size resistor to put in/ or what size resistor is already there..??
My ultimate goal is to put in a variable potentiometer so I can stop hyperflash but maintain the OEM bulb warning functionality in case I blow a LED..

Does anyone have the schematics/wiring diagram for this relay.. as well as the wiring diagram for a the turn signal/hazards for a euro 5.2 spyder..?

Also any thoughts/ideas as to how to achieve this mod would be greatly appreciated..






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In one word, yes. On LHD cars they are mounted next to each other, at least on LHD cars.

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I don't have one on my Australian '98 car but assumed they would be both located next to each other on an Australian car (on the right hand side). Note: It's not my car in the photo.

Experts??? @MAD828 ???

Well, you've answered one question I've had for many years. Is the accoustic repeater part of the load circuit for the turn system. "Sounds" like it is. Hence the hyper (or no flash).

I don't know if it's possible to substitute resistors in this device to simulate the proper load of the (individual) left and right turn circuits (with LED's fitted). I think it's only been done by varying the components in the hazard/turn module. You could try by putting two variable resistors across the blue/black and black wires (left turn circuit) and the blue and black wires (right turn circuit) of the accoustic repeater to see what happens.

I recently bought a "decade box" to carry out tests like this. Potentiometers are just too sensitive (and I don't know what range would be required for a pot)

https://www.ebay.com.au/itm/385528515205?

 

Lighting wiring diagram here:

https://www.dropbox.com/t/g1w0Dw8wwR2xFFGd

See 04580 for the Hazard/Turn Module and 06604 for the accoustic repeater

 

Would you be able to confirm that these are the right wire colours/wire locations for the acoustic repeater?

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(relay socket shown from contact side, not wire side). Note that there should be small numbers printed on the relay base

The OEM diagrams show a 5 pin module.

 

I will never understand the interest that people have with putting LEDs in classic cars. Especially expending effort like this kind of thing.

 

Ok..

So I had another look.. I can confirm there is no other relay in the drivers footwell apart from the acoustic relay in the AUDM 96 5.2 Spyder.
The wire colors/function are as follows..

30(6) = Power (Red/green)
HW (3) = LH Indicator (Blue/black)
L(6) = RH Indicator (Blue)
31/15R(2) = Earth (Black)

So its a little different to the above. Im not a guru at electricals by any means, but when I measure voltage through the Blue wire, it only jumps around when I turn on the RH ( when sitting inside the cabin) Indicator and no voltage jump when activating LH indicator). As such I can only confirm the above seems to be correct in my vehicle.

Here's some photos of that hard to get place..
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Wait a minute.. I found another Relay in the Drivers (RH) footwell. A perforated 6 PIN Relay 537 SEGNALATORE ACOUSTICO.
Its located directly under the steering column. Whilst the acoustic repater is near the drivers door hinge..
Not sure what this 537 SEGNALATORE ACOUSTICO is.. Could this be the 04580 for the Hazard/Turn Module..??




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No, that's something else again. I forget what that's for. I think there is also another one for the Spider roof buzzer.

You're absolutely sure there is no other module near your right hand knee? It's almost above the luggage compartment release on my car (above the carpet line, under the dash)

Weird. The wiring diagrams all show the blue/black is right hand and blue is left hand as it is on most Ferraris. I'm sure I've confirmed this on my own Aussie car (at the flasher relay), but I'll check again today.

1996 5.2? I thought the change date was 1997? So your engine intakes look like this with a single MAF?

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Just remembered. That controls the brake warning light test function (on start up). The aural function is not active on Australian/Euro cars.

 

Yes I can confirm my engine bay looks like the photo above.. Vehicle is an AUDM 1996 Gated 5.2 Spyder.
Ill keep looking for the 04580 for the Hazard/Turn Module.
Does anyone have a photo of it..? So I know what I'm looking for..?

 

Found It..!! What a sneaky bastard.. It was pointing upwards towards the roof from its mounting point & at 90 degrees from the horizontally placed (along the carpet line) Acoustic repeater 157498. I mistook it for a dash mounting point..What a PITA to remove and not drop the mounting screw/washer.. I used a strong magnet attached to the metal bracket on the Relay and this sucked on the screw and washer so they didn't fall behind the carpet line..
These are the markings on the Relay..
Does anyone know what the correct part number for the Hazzard Turn Module is..?
B883
60570359
72631
12V/2(4)x21W

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So I stripped it down.. Here is a look inside.. Now that's more like what I was looking to modify.., Namely that big Silver shunt Wire
Its 7 pin whilst the acoustic repeater is 4 pin


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LOL... I wished you'd posted these pics before I started pulling my car apart... It was a lot harder than I remembered to access it.

Mine is green but some are black. The part number varies for Euro/Aussie cars and USA cars. Mine has different numbers on it.

SDC B883 46466571 81994. 12v.2 (4) x 21W

Note that the act of pulling the relay out of the socket has a bad effect on the solder joints. Numerous issues have been caused by this.

I checked the tail light wire colours of my car and blue/black is for left, blue for right. EDIT: This is the same as the wiring diagrams. I'll try to confirm what signals are going to what module pins when I turn on the turn signals.

 

Heres a comparison between the Two.
Acoustic Repeater 157498 on the left (4pin) has a small green sticker and a green plug
Hazzard Module on the right (7pin) black plug
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Your car's hazard/turn module has the double internal relay type of flasher unit. Mine, I recall only has a single internal relay with a bigger IC on the circuit board. I don't know if the single relay type is compatible with the acoustic repeater.

I have striped cutouts in the module case to allow the sound to get out (because I don't have the repeater).

Your car's assembly number must be pre-24038

 

I guess it doesn't really matter what wire colours go to the acoustic repeater (pins L and HW) as long as a sound is made when one side is selected.

 

Yes Its pre.. 24038..

So ive had another look at the parts diagram..

Looking at the Parts diagram..for a Euro model Pre Assy No 24037

Acoustic Repeater 157498 is number 37 (4 pin/Perforated Top/green sticker) BUZZER RELAY
Hazard Turn Module 158019 is number 36 (7pin)(Not perforated) DIRECTION/EMERGENCY LIGHT RELAY

Glad we got that sorted out!!

NB: 158019 has been superseded by p/n 170762 and is x2 the price of the 157498 ( 100 vs 50 pounds)

Now does anyone have any tech savvy knowledge of how to modify either relay to kill hyperflash in our vehicles..??!!?..


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So I'm confused.. Why the hell is there a need for a perforated acoustic repeater when there is a hazard relay already there..?
Doesn't the Hazard Relay by itself click..?!

I'm glad you asked that question, and I can confirm it does click.. but no way near as loud as the perforated acoustic repeater or buzzer relay..

Can anyone shed light on exactly why the spaghetti heads in Italy did this..?

 

You have two "6"s... No wonder I'm confused

Probably to meet sound regulations, but then figured out that a module with a perforated case would be just as good.

 

Well it seems the acoustic repeater may have a hidden benefit..
One of the reasons I was looking at modifying the OEM Hazard Relay was to retain the sexy OEM turn signal/hazard metallic click with my LED conversion.

There is of course this option..

https://www.scuding.com/Shop/en/ecu-solutions/102-smart-tls-ecu.html

However it appears to only emit an entirely electronic ''beeping'' sound..Does anyone know if when this ECU is plugged into the Hazard Relay and the electronic beep is turned off, will we still get a metallic click through the Acoustic repeater,,?

 

Your colours don't seem to match the module pins, either.

Looking at your photos...

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That is:
31(15R) = Power (Red/green)
HW = LH Indicator (Blue/black) small pin.
L = Earth (Black)
30 = RH Indicator (Blue)

Ferrari really messed up the lettering/numbering on this one.
30 is usually power
31 is usually earth
L should have been Left turn, not earth
HW is usually associated with Hazard.

 

I'm guessing the numbering on the socket should be like this:

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i.e. if the numbering is like the relay socket

 

BINGO...HYPERFLASHED FIXED FOR $4..!!

A special shout out to Qavion and evo11 for their past efforts in shedding some light on this issue.

https://www.ferrarichat.com/forum/threads/problem-with-the-turn-signal-relay.632394/#post-147575326

In this thread evo11.(who also has a 5.2 Euro Spyder) posted a picture of his 7 pin Hazard relay internals and claimed he had success replacing this OEM flasher relay with the BMW 138533 (7pin) from an E36....

So spurred on by that success I gave it a go.

Here is a photo of the OEM F355 Turn Signal/Hazzard Relay 158019 side by side with the BMW 138533 Relay.
At first glance they don't look the same at all.. So I was doubtful that it would work.. But NOT ONLY did it work but it also fixed my HYPERFLASH issue with all 4 LED in place!! (No modding of the BMW relay required at all) AND best of all the bulb out functionality is retained!!

The LED's I used were iJDM (Aliexpress) with inbuilt load resistors 1.83A @12V = 21W x2 BAU15S & x2 BA15S front and rear.
These will hyperflash with the OEM Relay, but not with the BMW relay which i had purchased the other day at the wreckers for $4!!

Ijdm P21w Py21w Led Canbus Ba15s Bau15s 19w 1156 Car Led Light 3030 Smd Amber White Red Drl Auto Brake Lights Turn Signal Bulb - Signal Lamp - AliExpress

Gotta love a good 'smash and grab'

Now just got to make up a bracket to rivet to the body of the relay so I can mount it in the OEM position.

PS: Just noticed the BMW relay has DOT on it.. So maybe the reistances are different..?!? It actually came off a AUDM E36 BMW from the engine bay fusebox.. It also comes off these cars as well..

Oh and my side repeaters were not LED, they were OEM and so were my cluster turn signal lights.

61361388533 Hazard warning relay From: 09/01/1987 To:-
Supersedes: 61361388547(09/01/1987 — 12/29/2012),
Exchangeable retrospectively 61351392414 (09/01/1990 — 12/15/1992)
Part 61361388533 was found on the following vehicles:
•3' E36   (11/1989 — 08/2000)
•5' E34   (03/1987 — 06/1996)
•7' E32   (10/1985 — 04/1994)
•8' E31   (07/1989 — 05/1999)
•Z3 E36   (12/1994 — 06/2002




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I would like to thank everyone for their collaboration, both past and present on this project.

Me happy child now..

 

Thanks for the link to the BMW / Hella relay. I was looking for that but for some reason couldn't find it. I wonder if it would also be suitable for cars without acoustic repeaters (or single internal relay Hazard/Turn Modules)? I assume the BMW / Hella relay will only be suitable for Euro/Australian cars (because of the additional load of the side repeaters), but I may be wrong.

Lots of great additional information/details/photos. Thanks.