Disco 3 (LR3) Suspension fault. Compressor not running

giacomo.m said:

gstuart many thanks to you too,
I will also do these checks hoping to reach a positive solution,
the photo of the front height sensor connectors is excellent, but do you know where the C0377/C0391 connector for the rear sensors is ?

Click to expand...

Ur so very welcome , managed to find the picture for u, plus best to use some electrical spray to ensure it’s all clean

Indeed need to start from the fuses to ensure power is coming out of them and onto the relavent wires , connector’s etc

Plus 1 what @sierrafery has mentioned as if the system is locked out the light on the height switch will be out, if there no light it means the system has hard locked therefore disabling the system to protect itself , so need to reset the codes, then not rescan them as u don’t want them coming back and possibly locking the system out

A test light is also very useful as it puts the system under load

Hope that also helps u

sierrafery said:

As long as you have those permannent U codes you are checking sensor issues in vain, all the C codes are the result of those communication errors IMO...let's hope i'm wrong

Click to expand...

Hi mate

Great point as I remember someone else was having an issue but he didn’t realise the light had gone out on the height sensor switch where it had hard locked itself so wasn’t getting the proper readings

Also a chart showing what the compressor should be producing pressure wise, tested via live data , this is very handy as can also see the pressure sensor supply, motor temperature etc via diagnostics

Know it’s easy to skip but plse start from the fuses and don’t be tempted to skip a step, as in going through wire by wire, connectors etc in ensuring power is going from one to another

Live data is extremely useful as well in combination with a multimeter , test light

Hope that also helps

I checked the position of the front sensor connectors and the compressor power supply, but I found nothing under the front wheel arches, how is this possible?
2006 LHD
?

Hi

Hope the above information was helpful to u as it then lets us know if it helps or not

Assume u disconnected the large earth cable and wasn’t like that , also wonder if the connections are behind the headlight

Also the other circled wire I wonder if one wire is broken and if the the other one on ur passenger side if that’s ur connections
Easy to follow back from the front valve block and height sensors etc

Would also be interesting if the light is shown on the centre console where the suspension height lever is

Hope this is also useful to u