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Central locking inoperative using key fob.

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TheBoy:
I agree, put donor one back in, and keep it in for a considerable period (months), and if it doesn't cause issues, keep it in.

Generally when a circuit board has suffered water ingress, you can't just dry it.

johnnydog:
Thanks TB. I'll post how I go on... :y

johnnydog:
It's now over 6 months since I fitted the c/locking ECU from the donor car with the key fob parts from the donor car with my original key blades, and the central locking has behaved itself since operating as it should. My interior light and light switch / key in buzzer issues have also gone away. All, I presume, down to earlier water ingress from the sunroof drains (outlined in another topic). The 'new old stock' central locking ECU I sourced from Italy, although not needed at the moment, was still worth getting - just in case... :y

cam.in.head:

--- Quote from: TheBoy link=topic=148915.msg2040574#msg2040574 date=1712134486

Generally when a circuit board has suffered water ingress, you can't just dry it.
[/quote ---

yes absolutely this is true !     at work we wash and dry in a temp controlled enviroment  many electrical items.( electrical windings ,controls,boards etc) to rid them from dirt or oil contamination and providing they havnt been switched on whilst contaminated they usually survive but if something has suffered ingress and been left for a while ( or powered up) the chances fall drastically especially if corrosion or an electrical tracking path has occured.
this will affect many car control units or wiring considering the atmosphere they live in and damp,extremes of temp etc its a miracle they work at all.
the fact that many circuits and ecu's look for a definate on or off signal can be mislead as lots of control units will see a circuit as commanded on even if theres a resistance in it and so can turn something on by detecting a signal present even if its just a high resistance signal due to an earth leak .
think of it like a relay control . a 12volt relay doesnt necessarily need 12volt to turn it on .some may well turn on as low as 6 volts or so .and some high resistance logic circuit inputs can falsely see a switch-on signal that should be 12v but may only be a few volts in reality with a load applied !
--- End quote ---

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