C4 Electrical Problems

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

Moderator: RichardW

NickyC4Loeb
Posts: 4
Joined: 01 May 2020, 20:31

C4 Electrical Problems

Post by NickyC4Loeb »

Hi all,
I am finishing off a refurbishment of my 2008 C4 by Loeb and am down to 2 x electrical issues to sort out.

1 :- After start-up the system check puts up a "Braking system faulty" message. Using Diagbox it says the ABS ECU has a permanent fault. Using Lexia to dig deeper it has a fault message saying "under/over voltage to ABS ECU".

2 :- A/C clutch does not pull in when A/C switched on. I read on this forum that the cooling fans have to start before this can happen, they don't come on for me.

Does anyone have a wiring diagram for these systems or the whole car?

VIN number is VF7**************[VIN obfuscated, can be read by forum staff]

Many thanks in advance,
Nicky.

wheeler
Posts: 4261
Joined: 21 Sep 2002, 19:07
x 146

Re: C4 Electrical Problems

Post by wheeler »

Does the car have ESP? What is the RP number? This is the one circled below on the tyre pressure label.
Attachments
InkedRP label_LI.jpg
InkedRP label_LI.jpg (26.27 KiB) Viewed 74 times

NickyC4Loeb
Posts: 4
Joined: 01 May 2020, 20:31

Re: C4 Electrical Problems

Post by NickyC4Loeb »

I'm not sure about the ESP.
RP number is 1139788

NickyC4Loeb
Posts: 4
Joined: 01 May 2020, 20:31

Re: C4 Electrical Problems

Post by NickyC4Loeb »

Just had a look and there is no ESP deactivation switch. So I presume no ESP.

wheeler
Posts: 4261
Joined: 21 Sep 2002, 19:07
x 146

Re: C4 Electrical Problems

Post by wheeler »

Im guessing the last 2 digits of the RP number are wrong? should be 2 letters at the end.
ABS diagram attatched
The ABS ECU is component no 7020.
As for the other problem, The cooling fans normally cut in a few seconds after the AC clutch. Have you had the refrigerant pressure checked? If the system is empty or low this will stop the clutch from engaging.
Attachments
C4 ABS.jpg

NickyC4Loeb
Posts: 4
Joined: 01 May 2020, 20:31

Re: C4 Electrical Problems

Post by NickyC4Loeb »

Hi,
Thanks for the reply and diagram.

Can't get the pressure checked at present, will do as soon as possible.

RP number is right.
download/file.php?mode=view&id=22734
Attachments
IMG_1424.JPG

User avatar
Paul-R
Donor 2020
Posts: 4123
Joined: 07 May 2009, 16:24
x 419

Re: C4 Electrical Problems

Post by Paul-R »

88 is the factory ID for Mulhouse I believe. The list of factory ID codes in the Wiki is incomplete. I suspect that it leaves out Peugeot ones and I'm not sure where DS fits now.

EDIT
Wow, I found what claims to be a complete list of factory codes for Citroen. Any chance that the Wiki could be amended suitably?

A2 CENTRE HILLS (England)
CA CENTRE AULNAY (France)
CB CENTRE RENNES BT (France)
CC CENTRE DE CAEN (France)
CH CENTRE DE CHARLEVILLE (France)
CJ CENTRE RENNES-JANAIS (France)
CP CENTRE CHINE CKD AC (China)
CS CENTRE DE ST OUEN (France)
CV CENTRE MEUDON (France)
CX CENTRE ASNIERES (France)
FL CENTRE DE MANGUALDE (France)
FP CENTRE DE PINTO (Spain)
FT CENTRE DE TREMERY (France)
FV CENTRE DE VIGO (Spain)
FW CENTRE DE METZ (France)
G5 CENTRE DE DOUVRIN (France)
G8 CENTRE DE CREIL (France)
G9 CENTRE DE GENEVILLIERS (France)
UB CENTRE DE NEWCO
UC CENTRE DE OLCIT
UD CENTRE DURISOT
UF FORD
UG GRUAU (France)
UH KALUGA
UJ JAGUAR
UK CENTRE CIMOS
UM CENTRE MITSUBISHI (Okazaki, Japan)
UN CENTRE FIAT VILLANOVA
UO CENTRE TOFAS
US CENTRE SUZUKI
UT CENTRE KOLIN
UV VOLVO
UW CENTRE DE WUHAN (China)
UX XIANG-FIANG (China)
UY CENTRE MAGNA STEYR
UZ CENTRE KARSAN
U1 FIAT
U3 CENTRE DE PANHARD (France)
U5 CENTRE PININ FARINA
U6 CENTRE DAIMLER
U7 CENTRE HEULIEZ (France)
U8 CENTRE SEVEL SUD (France)
U9 CENTRE SEVEL NORD (France)
YA CENTRE INDONESIE (Indonesia)
YB CENTRE CHILI (Chili)
YC CENTRE NIGERIA (Nigeria)
YD CENTRE URUGUAY (Uruguay)
YE CENTRE KENYA (Kenya)
YF CENTRE ZIMBABWE (Zimbabwe)
YG CENTRE TURQUIE (Turkey)
YH CENTRE POLOGNE (Poland)
YI CENTRE IRAN SAIPA (Iran)
YJ CENTRE EGYPTE (Egypt)
YK CENTRE THAILANDE (thailand)
YL CENTRE MALAISIE (Malaysia)
YM CENTRE RUSSIE (Russia)
YN CENTRE IRAN KHODRO (Iran)
YP CENTRE MAROC (Morocco)
YQ CENTRE MALAISIE GURUN (Malaysia)
7B BARUERI BRéSIL MAG PR (Brazil)
7D FRANCAISE DE MECANIQUE (France)
71 GEFCO (France)
72 HERIMONCOURT (France)
73 NANTERRE (France)
74 CENTRE DE VALENCIENNES (France)
75 SFME (France)
76 SLOVAQUIE TRNAVA (Slovakia)
77 ARGENTINE BUENOS AIRES (Argentina)
78 BRESIL PORTO REAL (Brazil)
8E CENTRE DE SEPT FONS (France)
8F CENTRE SHERPA
8M CENTRE DE MELUN (France)
81 CENTRE DE POISSY (France)
82 CENTRE DE MADRID (Spain)
83 CENTRE DE RYTON
84 CENTRE DE DIJON (France)
85 CENTRE DE VESOUL (France)
87 CENTRE DE LILLE (France)
88 CENTRE DE MULHOUSE (France)
89 CENTRE DE SOCHAUX (France)

Source http://citroenjin.blogspot.com/2012/12/ ... n-psa.html
Last edited by Paul-R on 02 May 2020, 16:40, edited 2 times in total.

wheeler
Posts: 4261
Joined: 21 Sep 2002, 19:07
x 146

Re: C4 Electrical Problems

Post by wheeler »

Strange, I've only ever seen letters as the factory codes.

User avatar
Paul-R
Donor 2020
Posts: 4123
Joined: 07 May 2009, 16:24
x 419

Re: C4 Electrical Problems

Post by Paul-R »

There's a typo in the Wiki, Aulnay sois Bois should be Aulnay sous Bois.

User avatar
xantia_v6
Forum Admin Team
Posts: 7436
Joined: 09 Nov 2005, 23:03
x 415

Re: C4 Electrical Problems

Post by xantia_v6 »

For the A/C problem, you should be able to get some clues looking at the live data in diagbox, which will tell you the status of each sensor and control.