Water-damaged BCM, BSI or SAM: what to do
Body control modules often live low in the footwell, under a seat or near the scuttle — exactly where leaks collect. Acting quickly gives the best chance of saving the module and its data.
What to do straight away
- Disconnect the battery to stop corrosion spreading while the board is wet.
- Remove the module, open the connector covers and let it dry. Don't power it up wet.
- Find and fix the leak (blocked scuttle drains, door membranes, windscreen seal, sunroof drains) or it will happen again.
What we can do
- Clean and repair corrosion damage at component level, keeping your original module and its data.
- If the board is too badly damaged, read the memory (sometimes directly from the chip) and transfer it to a matching donor.
Typical symptoms after water ingress
- Random locking, lighting or wiper behaviour.
- Battery drain overnight.
- No crank or immobiliser active.
- Module not communicating with the diagnostic tool.
Questions
Can a water-damaged module be saved?
Often, if it's dried and treated quickly. Even when the board can't be saved, the data usually can.
Need it checked?
Send your part number and a label photo — we'll tell you whether it's a repair or a clone, and the price, before you post.
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General guidance only — always diagnose the vehicle properly.