458 fuse removal for Headlamp Washer

458 fuse removal for Headlamp Washer

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v12uuu

Original Poster:

61 posts

150 months

Saturday 12th January 2019
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Does anyone else find it frustrating that the headlamp washers come on with the windscreen wash? I know it is a pretty typical setup, but the 458 is mostly always clean and the headlamp spray just makes a mess.

I see there is a simple fuse to remove - in the glove box. I know it is now an MOT point for HID lamps, so I will need to put it back before a test. However, I have not worked out how to access the fuse.

Has anyone done this? Any tip on how to remove the panel in the glovebox to reveal the fuses?

Many thanks!

JW82

135 posts

107 months

Saturday 12th January 2019
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I’m pretty sure that the headlamp washers don’t come on at the same time as the screen washers on my car but you need to turn the headlight setting dial to “Off” as opposed to “Auto”. Good luck!

v12uuu

Original Poster:

61 posts

150 months

Sunday 13th January 2019
quotequote all
Yes, if the headlamps are off, then only the screen is washed (the same is true in aut). But this is difficult to do in the dark!

JW82

135 posts

107 months

Sunday 13th January 2019
quotequote all
Oh, I see what you mean now for night time.

v12uuu

Original Poster:

61 posts

150 months

Saturday 19th January 2019
quotequote all
Not much of a response. Maybe fuses never need changing? spin

Fiammetta

404 posts

87 months

Sunday 20th January 2019
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You might be looking down the wrong end of a telescope.
The fuse may feed multiple things .
If it does the headlight washers will have a dedicated relay .Its this relay you need to find and pull .
Shown be shown in the owners manual ?

Alternatively if you can locate the tank there will be two motors , a small one for the screen and a more powerful/ bigger for the HL washers , pull a motor wire on this .
Or cut the supply pipe out from this motor if it’s a multipug ( can’t tell which wire does what ) .
Do it in such a way you can reconnect.
Don,t clamp it as the pressure will cause it to blow off in a Sod’s law inaccessible place necessitating a bumper removal, not desirable .
Just connect another pipe and run it outside .
Remember to reconnect it for the mot .

That way the relay and motor are excerised as per the preprogrammed 1/6 or what ever .
Complete isolation via pulling the relay or pulling the motor plug may lead to a ceasure or depending how Ferrari have gone CEL / ECU a dash light on which needs an expensive dealer only laptop to clear , again not good .


v12uuu

Original Poster:

61 posts

150 months

Sunday 20th January 2019
quotequote all
Thanks for the suggestion - although I would be reluctant to cut into the wiring.

According to the manual, F-85 is Headlamp Washer - nothing else is mentioned. So hoping it might be a simple thing to isolate just that.

If someone has had success at it, would love to hear.