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Dear B.B.,
Hope you're well and stay so. "De-corroding" the C54 connector required separating both halves.
As the ECU is inside the car, I'd guess corrosion on ECU connector terminals could only be a problem if the car lives in a high-humidity region and is parked outdoors.
You may recall that Takata airbags - not used in rear-wheel-drive Volvos - are most likely to turn into a "fragmentation grenade" on deployment, in cars that "live" in hot/humid areas. Humidity destabilizes ammonium nitrate used to generate the nitrogen that fills the airbag.
Based on years of reading posts, I don't recall many reports of problems with corrosion on ECU connectors. Should that occur, the ECU connector's design is different and more robust.
Thus, if corrosion is suspected as a source of malfunctions, separated the connector from the ECU, having first disconnected the negative battery cable clamp from the negative battery terminal. Then, spray DeOxit or a similar aerosol corrosion remover on the ECU's terminals and on the connector's terminals. Allow to dry. Re-seat the connector on the ECU. That should restore full connectivity.
Hope this helps.
Yours faithfully,
Spook
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