Circuit Diagram request

This is the Forum for all your Citroen Technical Questions, Problems or Advice.

Moderator: RichardW

MidlothianMark
Posts: 4
Joined: 07 Dec 2021, 15:46

Circuit Diagram request

Post by MidlothianMark »

Can anyone help me get a Circuit Diagram / Diagnose a fault?
I have a 2014 Citroen C4 Picasso VTR+ 1.6 HDi, VIN No VF7**************[VIN obfuscated, can be read by forum staff].
The Heater Blower Motor stopped working last week, it had previously been working and sounding fine. I don't have a Circuit Diagram for my model, but I have been using posts on this forum to carry out as many checks as I can:-

1. I checked every fuse I can find in the Engine Fuse Box and the Passenger Glove Box, all OK

2. I have removed the Blower Motor and tested it on a bench using a spare battery, it works OK and runs smoothly.

3. I have removed the Blower Motor Contol unit and tested it with the Blower Motor on the bench. I used the spare battery and a power supply to create a control signal, I was able to get the Blower running at different speeds by changing the voltage onto the controller "IN" pin (normally connected to a very thin Yellow/White control wire) It works OK

Without a Circuit Diagram I am struggling to trace where the Control Signal should come from, and what other things to check next, eg. which Relays are connected to it.

I am new to this site and have found the forum very informative.
Any help would be greatly appreciated
Thanks,
Mark (from Midlothian / Scotland)
User avatar
Chris570
(Donor 2020)
Posts: 1460
Joined: 12 Dec 2009, 15:10
x 5

Re: Circuit Diagram request

Post by Chris570 »

If it is the current shape one I can't help. BUT if it is a later 07 to 14 then have a look in the engine fusebox for a single relay at the front and give it a clean up and test it. That's what did mine with exactly the same symptoms.
MidlothianMark
Posts: 4
Joined: 07 Dec 2021, 15:46

Re: Circuit Diagram request

Post by MidlothianMark »

Thanks for your Reply Chris.
Mine is the new shape (2014) MKII and the Aircon/Heater Blower speed is selected on the touch display screen in the centre of the dashboard. I will have a look at the relays, but there are loads of them in the Engine Fusebox and Passenger Glovebox Fusebox. I'm hoping for a circuit diagram to help me identify which Relay(s).
MidlothianMark
Online
wheeler
Posts: 5392
Joined: 21 Sep 2002, 19:07
x 340

Re: Circuit Diagram request

Post by wheeler »

This should hopefully be the diagram for your car. I have had to do it in 2 halves as the scaling is to small to read as one.
Attachments
top.jpg
bottom.jpg
MidlothianMark
Posts: 4
Joined: 07 Dec 2021, 15:46

Re: Circuit Diagram request

Post by MidlothianMark »

Hi Wheeler,
Thanks for your reply. This looks like the Circuit Diagram for my car, but I can't read it even if I print it out magnified because the quality is so low. Are you able to send me a better copy?

Anyone else have a circuit diagram they can send me please?
Or does anyone know where I could get a Circuit Diagram, even if I have to subscribe somewhere?

Many Thanks,
MidlothianMark
User avatar
GiveMeABreak
Forum Admin Team
Posts: 26600
Joined: 15 Sep 2015, 19:38
x 3109

Re: Circuit Diagram request

Post by GiveMeABreak »

Leave it with me...

Ok, this is the correct one for your vehicle based on your VIN. It is slightly different to the previous one but will scale at any size so you should be able to view it at any size without issue.

This one takes into account the electronic architecture installed, the correct A/C system and other options.

Image
MidlothianMark
Posts: 4
Joined: 07 Dec 2021, 15:46

Re: Circuit Diagram request

Post by MidlothianMark »

Thanks you very much for this, it prints out nice and clear.
Hopefully now I will be able to trace the fault.
Cheers,
MidlothianMark