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How long ago did the water damage occur? If it's working properly and the leak was repaired, you may be better off not replacing it – it's likely to be a very expensive part, and the one you have now may not actually have anything wrong with it.
As for where to buy, the dealer will have it (just be sure there's a defibrillator nearby when they quote you the price), or maybe check some salvage yards. The parts websites I use don't have it – presumably that module wasn't used on the US-spec GS – so unfortunately I can't give you any other recommendations
How long ago did the water damage occur? If it's working properly and the leak was repaired, you may be better off not replacing it – it's likely to be a very expensive part, and the one you have now may not actually have anything wrong with it.
As for where to buy, the dealer will have it (just be sure there's a defibrillator nearby when they quote you the price), or maybe check some salvage yards. The parts websites I use don't have it – presumably that module wasn't used on the US-spec GS – so unfortunately I can't give you any other recommendations
my front window was the cause of the problem. That window Will be replaced today. If the ecu keeps on werking there is no problem. I Will wait and see. Thank you for answering.