Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
Compressor not switching on - yellow light
Hi, reaching out again since my last LR issue and looking for some help. Just driven half way around Europe with no issues and a week back my suspension is not playing ball again.
So, after 2000 miles of trouble free motoring directly after refurbing the compressor before I left on the European trip, the yellow light is back on... again.
But this time I'm getting nothing at all from the compressor. It's not activating on startup and the light comes on after 20 seconds.
So on startup. the compressor will not activate.
Here are my codes:
RLM
U0416-86
C1A00-1D* will not clear
C1A00-54* will not clear
ATCM
U0416-94* will not clear
U0421-94
VDM
C1A00-88
U0128-87
I have checked the fuses and relay under bonnet and behind the glove box and no issues. The suspension has no Leakes and maintains its height.
I have recalibrated the steering and the centre console switch works. I also refurbished the valve blocks about 3 months ago.
So I'm just looking for a logical next step. Any takers?
4th Sep 2022 1:06 pm
Admirable
Member Since: 19 Jul 2015
Location: Fife
Posts: 1011
Rear valve block disconnected or control module failure or both?
EDIT: have you set the control module to TT mode?
4th Sep 2022 4:42 pm
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
Will check the rear block but I do get a lot of module errors so this could be the next suspension job. must be about the 6th time I have had to deal with the suspension one way or another.
4th Sep 2022 4:46 pm
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
Admirable wrote:
Rear valve block disconnected or control module failure or both?
EDIT: have you set the control module to TT mode?
Not come across 'TT mode' yet, I have the icarsoft LR3 code reader and can mess about with the suspension but this time round it's not playing ball.
More and more I think about it the module does seem to be the culprit. However I did jump the relay (cutting out the ECU) and it still wouldn't start the compressor.
4th Sep 2022 4:53 pm
Admirable
Member Since: 19 Jul 2015
Location: Fife
Posts: 1011
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782
If you jumpered the two large relay slots and nothing worked, check the 60/70 amp fuse near the relay. My one is a brown colour. They changed to 70 amp around 2008 I think.
6th Sep 2022 11:36 am
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
will do thanks for the suggestion.
Haven't been able to test tt mode yet so will do this first and report back.
These discovery's seem to like sending us on a merry dance each time there is an issue so maybe I should wait for a full moon before digging deeper
7th Sep 2022 12:32 am
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
Well a small light at the end of the tunnel. After a bit of fiddling, I can now switch the compressor on by jumping the relay.
However the yellow light is still coming on. Can anyone confirm then that it is likely the EAS module and if so what are the steps to replace it?
I am assuming disconnect battery, switch over the old for a new module and then...? Do I need to get it programmed or can I recalibrate with my LRv3.0 Carsoft?
12th Sep 2022 12:38 pm
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
Well after swapping modules no change.
When I jump the relay the compressor started and gallery pressure increased to 1200Pa and then steadily decreased to 98Pa
The car through my icarsoft scanner will open the valves and the car lowers but I can’t raise it now.
I tried TT mode nothing changed and even showroom return and the compressor does not engage
24th Sep 2022 2:27 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10361
i think you need to program your key so the LR button does suspension. See here.
Once you have done that, selecting raise on key should instantly start the compressor running while the buttons are held. (get someone else to press the buttons)
If the compressor does not run you can measure the voltage across the relay solonoid terminals to see if you have 12v when key held. and if not, check the wires back to the suspension ecu.
other simple things are to try another relay.
is the dash light red or yellow ?
What fault codes do do you with the new ecu after clearing?
24th Sep 2022 3:14 pm
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
Well it was worth a go , I re-programmed the key and can see the height select button changing as I try to use it but the compressor still doesn't start.
I am still stuck with the amber warning light on the dash as for the codes I will take a look tomorrow but so far this is what I encounter:
RLM
U0416-86
C1A00-1D*
C1A00-54*
ATCM
U0416-94*
U0421-94
VDM
C1A00-88
U0128-87
If the compressor does not run you can measure the voltage across the relay solonoid terminals to see if you have 12v when key held. and if not, check the wires back to the suspension ecu. I think there must be a dud wire as things stand. I have the wiring diagrams but it feels like this could unravel over a few days as I have eliminated the ECU, fuses and know the compressor is not faulty.
24th Sep 2022 9:44 pm
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
I have checked the compressor voltage and it is always at 0 volts when I use the height selector switch.
What colour is the signal wire to the compressor from the ecu?
And which plug does it use? I think it’s the 2320
25th Sep 2022 12:29 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10361
I’ll Check later.
You really need to to measure the voltage at the relay coil yourself. (They are the other contacts you did not bridge) The diagnostic machine is reading a different voltage.
You may want to refit your old ecu now you have proved it has made no difference.
Just incase it’s making things worse as it’s not tuned to your car
25th Sep 2022 1:21 pm
Disco_Dunce
Member Since: 27 Nov 2021
Location: Manchester
Posts: 51
Case closed and sorted with a cable tie.
Rear valve block connector doesn’t stay in place. I checked a couple times but in the end with a block of wood to stop my arm from getting crushed I got my missus to press the height selector button while I was keeping pressure on the connector.
Thanks for everyone’s help and I bow down to the first poster here who did suggest it but that’s life I suppose!
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