Troubleshooting electrical issue - Windscreen Wipers - 2022 Fiat Carthago (1 Viewer)

[Abgs]

I hadn’t driven the van for about eight weeks until yesterday whereupon I noticed my wipers weren’t working.

The van is under warranty so I will book it in somewhere to get it looked at but ….

I have obsessive need to know how stuff works so my preferred option would be to find and fix the problem myself.

So far I have checked the dashboard fuse number 43. This is fine, if I pull it the washers stop working so I know it fuse is OK.

I have downloaded an electrical circuits diagram for the Ducato which explains and locates all the of wiring connectors, along with the various fuseboxes and electronic modules.

Looking at the under-bonnet fuseboard the wiper 30Amp fuse is no. T20 along with a relay No. T19.

If I pull the electrical connector at the wiper motor and check the voyage across the pins I am getting readings around 9V. ignition off - 0 Volts. So something is getting there.

I have manually moved the wiper arms in case the motor had seized but all seems free enough. Obvs I gave the motor a light tap with hammer in an oldschool mechanic approach.

I will try the under-bonnet wiper fuse T20 next but my question is … if the relay, no. T19, has failed are they a specific Fiat part or a generic relay?

The relay is listed a 30Amp Micro on the electric diagram.

If they are a generic part should I be carrying a spare relay in my general toolkit?

 

[peterc10]

If Carthago are like Hymer they will have added a "box of bits" to the Ducato so as to increase the power of the wiper motor to cope with the larger area of the windscreen in your A class. That may be the culprit, as it was in my Hymer.

 

[Abgs]

Pretty sure there isn't a box of bits on this one - the wiring from the motor follows back to the various Ducato control modules. The motor has a Fiat part number on it also.

The windscreen on the 138 A Class is as big as a full fat Carthago A Class so I think the Fiat motor shoudl be fine for it.

I'll have another look at it toorrow....

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[Abgs]

Well ....

Turns out the heater fans were not working as well. Very strange!

But I have fixed it.

The 5amp fuse in position F31 had blown. This fuse is listed as 5A Interior light relay.

I had piggy backed off this fuse to run my dashcam when it's in parking mode and it has been working fine for the last 6 months or so.

Swapped the fuse and both the heater fans and the wipers fired up again perfectly.

I can't work out why fuse F31 would effect the wipers and heater though.

So in short - a 1 minute fix but ... I spent hours trying to figure it out. However I have learnt a lot about the electrical system and where the key components are located and how they mesh together.

 

[the1andonly]

I have downloaded an electrical circuits diagram for the Ducato which explains and locates all the of wiring connectors, along with the various fuseboxes and electronic modules.

Where did you get the info? was it

X290 Electrical Circuits

X290 Electrical Circuit Architecture

www.fiatforum.com

X290 Wiring Diagrams

X290 Compact network architecture

www.fiatforum.com

or somewhere else. If so where or what?

 

[DavidG58]

Maybe as well you didn’t get as far as a workshop, it sounds like they could easily have blamed it on you, odd as it seems

Nice to sort it quickly though

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[Abgs]

Where did you get the info? was it

X290 Electrical Circuits

X290 Electrical Circuit Architecture

www.fiatforum.com

X290 Wiring Diagrams

X290 Compact network architecture

www.fiatforum.com

or somewhere else. If so where or what?

Yep - those are the ones.

 

[the1andonly]

Bugxxx was hoping it was a new source. When i got these not quite what i needed but glad someones got the use.