Quote:
Originally Posted by pelagicskipper
When I opened the AUU I discovered evidence of water ingress through the connector and across the circuit board.
next steps are;
1; locate and seal where water is getting into foot-well.
2; clean board with alcohol based cleaner (no visual signs of scorching)
3; follow the options as suggested by SwissXC90 above.
I will update on the final outcome in case it will be helpful to others in the future.
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Well done on finding the root cause (water ingress in AUU)
You have another option:
Get a donor AUU of identical part number, and swap the Flash Memory from your AUU to donor AUU. Assuming your flash memory chip is unaffected by corrosion!. Thus the donor will receive the same serial number as the serial number is stored in flash memory, and the car will think it is the same device, and everything will happily work again.
If you have no surface mount soldering skills, contact someone who has and will be willing to help you, such as https://volvodiagnostic.com/shop/index.php
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XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65.
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