01324 no connection to all-wheel drive system

[jormaw]

Hi.

Car is 2017 204hp t6 4motion. We replaced all cv joint boots (removed all drive shafts) and next day after 50 km esc-light came on and start-stop wont work. Fault codes says 01324 no connection to haldex unit and other communication errors between ecus.
Local car electrician didnt find problem from ecu when he opened it (no water leaks or cold solders etc). I have checked fuse sc33 and checked the connector with multimeter. Can-bus voltage was ok and there was one pin with battery voltage and one pin which voltage varies from 7 volts to 12 volts, is this normal? What should i check next?

 

[mmi]

I have checked fuse sc33 and checked the connector with multimeter. Can-bus voltage was ok and there was one pin with battery voltage and one pin which voltage varies from 7 volts to 12 volts, is this normal? What should i check next?

Would be helpful to know which connector, pin number and also wire colour.
Assuming not equipped with diff-lock and speaking of 8-pin connector at Haldex/BW control unit:

as powered directly through fuses SC33 and SF1 wouldn't expect any voltage fluctuation on open connector.​