When I thought I had a air suspension ecu problem I got one off eBay,turned out no problem with my original ecu but it didn’t cost a lot think it was about £25

The valve block that you found for 261 Euro is aftermarket
thats not me, i believe the valve is original, it is a WABCO unit, i think that is the original make
i pulled it all to bits and it looked ok, so i reassembled it.
the next step was to hot wire it and i read your post, telling me to just do that hahaha
well i did and every thing worked
i worked out which was the ground wire with an OHM'S meter
what i can't understand is that it has two air pressure supply pipes.
one from the air tank and one from the compressor ???
any way, it seems to work
i think the next step is to check the wiring from the ECU to the valve block, if thats ok, it must be the ECU
well, here is hoping
i do miss it, i have a jaguar s-type, which is good, but not as good as the RR
thanks for your advice RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar

will308f wrote:

When I thought I had a air suspension ecu problem I got one off eBay,turned out no problem with my original ecu but it didn’t cost a lot think it was about £25

"i worked out which was the ground wire with an OHM'S meter"
actualy it has one power wire and two ground wires RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar

looks like its fixed, three days and every thing looks fine RR 2005 4.4 petrol
Any spelling mistakes are the fault of spellchecker
Previous MG J2, CITROEN light 15 x 2 gone unfortunately
Present MERC 180e, RANGE ROVER L322, JAGUAR XJS, MERC 280SE, MG F, JAGUAR S-Type 6v 2003, jaguar s-type 8v 2004, Ford Cougar