Jumpeingr 5 and 7 is what the relay does, so your compressor is good
and the clutch coil conducts enough to at least spin it, but that does
not mean the KLIMA is good.
As I said, the PBCU switches on the compressor by grounding the wire
from the low pressure cutout switch, so if the KLIMA is good,
grounding that wire indicates that the PBCU is bad for some reason.
If there is no voltage present at the low pressure cutout switch,
either the wiring or the KLIMA is bad, and if there is but you don't
get the compressor to come on when you ground it, the KLIMA is bad.
You should also check the OVP relay, as I think the PBCU is protected,
and a bad OVP relay will leave you with no or intermittent operation.
Peter
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