456mgt fuse circuit board question

https://www.ebay.com/itm/Ferrari-456-Complete-Electric-Board-Fuse-Panel-Relay-Board-180024/121670642535?hash=item1c5422ab67:g:Wf4AAOSwBLlVciyG

or send Guido a message
https://www.ferrarichat.com/forum/threads/fuseboards-new.582139/#post-146213575

or take the fuse board out and repair it yourself, it's not that hard

 

There is no "relay" associated with the wipers other than the main ignition relay "S". There is a control module, however. Do the washers work? This will help determine if it's a fuseboard power issue.

Are you willing to run your own tests? Do you have a voltmeter/ohmmeter and some basic tools?

 

With the ignition key in run, check for 12 volts at these points:

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Is this the "relay" they replaced?

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(mounting brackets may be different, depending on Ferrari)

 

https://ferrarichat.com/forum/threads/oem-fuseboard-456-gt-and-m.630402/

 

My wipers sometimes work and sometimes don't, although once working the seem to continue. The washers work even when the wipers don't.

I wondered if there was an update on this thread please?

 

If your washers work, it's probably not a relay/fuse board problem. The washer controls use the same power . See the blue/black (LN) wire in the diagram below.

When the wipers don't work, do none of the speeds work? (int, slow, fast). There is independent wiring for each selection.


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Other than the steering column stalk switch, everything is controlled by the module. If the wiper motor isn't faulty, the module probably is. Check the module pins for corrosion (if you can find it)

 

thank you for your reply.

The wiper operation is either all speeds work or no speeds work.

I have been looking for the wiper control module under the passenger side (LHD) glove box. Lots of fuses and relays but nothing visible that looks like the Bosch wiper control module. Any clues on finding it please? Then I can check the connectors and report back.

 

Usually on UK cars, the stuff under the dash is mirrored, so you may have more luck looking on the right hand side.

I've reversed this image, but the location is still pretty vague.

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Mine is a UK supplied Left Hand Drive car. Ordered by the Chief Engineer for Lotus F1 Racing Team to drive to European Grand Prix.

So my steering wheel is on the left. Thank you for reversing the image, but as I try to re-reverse it in my head I'm getting super confused! Would you look under the steering wheel on my LHD car?

 

It's probably somewhere between the steering column and the centre console (on left or right hand drive cars), but check both sides of the column (under the dash)

 

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Or they could have hidden it where they hid the module on the 550... behind the side kick panels..

https://www.ferrarichat.com/forum/posts/147642865/

 

Super kind of you. Thank you.

 

On an LHD Euro car the wiper relay was under the dash on the lhs under the steering wheel.
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I opened the unit up to look for broken soldered joints, corrosion etc but everything looked fine. When I put it all back together it continued to work intermittently. However, if I wiggle the wires on the plugs the wipers work fine, so I'm guess that loose wires will be my next focus.

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Sometimes it's good to look at the solder under a magnifying glass. Especially where the plug pins attach to the circuit board.

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Were you able to identify which plug the intermittent wiring was on? The small plug feeds out to the wiper wiper motor, the large one is power and switch signals into the module.

 

I'll get my magnifying glass out and have a better look. I will report back.

 

Thanks for the suggestion. I couldn't see any weak joints, so I re-soldered all of the plug pins joints and re-fitted the unit.

Success!

 

Cool. Thanks for the feedback!

A similar thing happens with the Hazard/Turn Module, too (next to the Wiper Module). I'm not sure why they are so susceptible to this. By the way, thanks for posting the photos... a handy location guide