C4 Picasso heating climate problems

[shaun1983m]

Hi all I’m after some help with my 2008 c4 Picasso exclusive for the last few weeks the climate control panel has been flickering on and off which results in heaters going on and off now it’s gone off altogether drivers side and passenger side not even illuminated so now I have got to have the windows open in this weather so the screen doesn’t mist up any help in what it could be would be much appreciated

[GiveMeABreak]

Try a BSI Reset / Battery Disconnect / Reconnect Procedure first as that can eliminate any BSI issues.

If that has not solved it, then ideally a diagnostic with Lexia / Diagbox would be recommended to determine the fault. I could just say the A/C ECU, but it really needs a diagnostic first.

[shaun1983m]

Thanks will give it ago tomorrow. Also Could you tell me where the climate ecu is located please

[GiveMeABreak]

Best to pop your VIN up (please post your VIN in full without spaces - it will be automatically masked from public view after submitting your post & will only be visible to staff) as there are multiple variations to these depending on trim level and model / options.

[shaun1983m]

Thanks VIN: VF7**************[VIN obfuscated, can be read by forum staff]

[GiveMeABreak]

As there are both driver and passenger controls at each end of the dash for controlling the system and you have said that both displays are fading, it would lead me to suggest the AC ECU as both these units plug into the AC ECU. What about the rear passenger control units? Are these displays also fading?

I would suggest that you get the AC ECU diagnosed as faulty to confirm this.

The ECU itself is on the right side of the fascia, shown here as item (3):

All the control panels front and rear feed into this ECU

[shaun1983m]

Thanks the front panels don’t light up at all and the rear ones haven’t got screens just a knob which doesn’t work now.

[shaun1983m]

Second hand ecu is only cheap on eBay if I get one the same part number to try is it just plug and play or does it need to be programmed in

[GiveMeABreak]

There are various part numbers for this unit, so ensure you have an identical part number. Whether it will need any configuration I can't say from here of course, but there is nothing to suggest that it does from the info I have.

[shaun1983m]

Thank you very much for your help your a legend I will update if it works

[shaun1983m]

Just an update thanks for your help bought a second hand ecu off eBay £12 bargain replaced the old one it is a bit fiddly but 10 mins later all working fine thank you

[GiveMeABreak]

Great news, well done and thanks for the update.