Citroen C4 Grand Picasso rear Suspension failure

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

Moderator: RichardW

Post Reply
andybee
Posts: 2
Joined: 17 Oct 2020, 12:02
Location: Dorset
My Cars: Citroen C4 Grand Picasso 2009

Citroen C4 Grand Picasso rear Suspension failure

Post by andybee »

Hi all,

I'm new to this site so i apologise if this subject has been raised numerous times before!

My C4GP (2009 Exclusive) has had suspension problems for a little while. Basically each morning i have come out to the car and the rear end is right down on the floor. Usually by unlocking the car the compressor fires up and up goes the car. I can only guess that there has been a leak in one of the airbags causing this? However, i came back to the car at the end of my day at work yesterday, unlocked the car and nothing. I have tried the button located in the boot and still nothing. When i put the key in the ignition i get "Suspension Faulty" on the screen.

Can anyone give me any suggestions as to what maybe wrong? I'm guessing either the compressor has given up (although this was replaced under warranty 5 years ago by the Citroen dealer that i bought the car from) or is it something more straightforward.

Any ideas would be gratefully received as i am now without a car!!!

Thanks all.
Last edited by GiveMeABreak on 17 Oct 2020, 13:34, edited 1 time in total.
Reason: Moved to Citroen Tech Forum
User avatar
GiveMeABreak
Forum Admin Team
Posts: 37014
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5648

Re: Citroen C4 Grand Picasso rear Suspension failure

Post by GiveMeABreak »

Pop your VIN up please (Automatically Masked on submission) so I can see exactly what you have, but in all honesty, it would be better to obtain the exact fault codes from a diagnostic so we can get an idea of what is wrong with it.

If you can hear the compressor working, then it won't be the compressor relay, ff not, check the relay.
If the compressor is operating, but the car is not raising in one side, then it may be a leak in the spring / cushion on that side.
If it's not raising on either side and you can't hear the compressor and it's not the relay, then it's likely to be the compressor.

But fault codes will be helpful.
Please Don't PM Me For Technical Help

Marc
andybee
Posts: 2
Joined: 17 Oct 2020, 12:02
Location: Dorset
My Cars: Citroen C4 Grand Picasso 2009

Re: Citroen C4 Grand Picasso rear Suspension failure

Post by andybee »

Hi Marc,

Thanks so much for your reply. I'll get the VIN for you later on if that's ok. Whereabouts would the relay be located? The compressor is definitely not running so i'd like to check the relay first.
User avatar
GiveMeABreak
Forum Admin Team
Posts: 37014
Joined: 15 Sep 2015, 19:38
Location: West Wales
My Cars: C3 Aircross SUV HDi Flair Peperoncino Red (The Chili Hornet)
C5 X7 2.0 HDi Exclusive Mativoire Beige (The Golden Hornet)
C3 1.6 HDi Exclusive Aluminium Grey (The Silver Hornet)
C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5648

Re: Citroen C4 Grand Picasso rear Suspension failure

Post by GiveMeABreak »

That's the bad news!

The relay is built onto the circuit board on the Suspension ECU that is contained under the rear left passenger floor well.

The relays are actually three or four MOSFET transistors soldered onto the underside of the board itself.

As for fuses, it may be worth checking those too:
MF8 is the 50A Maxi Fuse that supplies the suspension ECU.
F10 in the BSI (15A) is the suspension Control Unit.
F4 10A in the BSI is for the fuel additive pump - photochromic interior rear view mirror - suspension control unit - driver´s aircon control panel - multimedia assembly
Please Don't PM Me For Technical Help

Marc
tomek13221
New User
Posts: 1
Joined: 18 Jul 2021, 09:33
Location: Przemyśl
My Cars: Citroen C4 grand picasso

Re: Citroen C4 Grand Picasso rear Suspension failure

Post by tomek13221 »

Where can I find the fuse in Citroen C4 Picasso ?
MF8 is the 50A Maxi Fuse that supplies the suspension ECU.
Post Reply