XC40 Mirror Heating Issue

I understand you are experiencing issues with your Volvo XC40's mirror heating. Have you checked the relevant fuses? A blown fuse can often be the culprit. Could you specify the exact error code you retrieved from the OBD scanner? Have you noticed any other electrical issues such as the automatic temperature control exhibiting any strange behaviour or just the mirror's?

I have inspected the fuses, and they appear to be functioning correctly. The error code is B12D3-15, which pertains to an open circuit or short circuit to battery in the right side mirror heating element. I have not observed any anomalies with the automatic temperature control or other electrical components. Considering the error code and the absence of other electrical faults, what would be your recommendation for further investigation?

Given that you've checked the fuses and the error code points to a fault specifically within the mirror heating circuit itself, and assuming it is not a general climate control issue, it does seem like the problem lies within the mirror assembly or its immediate wiring. I would then suggest taking the car to a trusted local workshop. They can use professional diagnostic tools to pinpoint the exact location of the open or short circuit within the mirror's heating element or wiring. Attempting to repair this yourself without the proper tools and expertise could potentially lead to further complications or damage.

Following your advice, I brought my Volvo XC40 to a local workshop for a professional diagnosis. As suspected, the issue was a defective plug connection within the mirror assembly, resulting in an open circuit. The repair involved replacing the faulty connector, and the mirror heating function is now operating correctly. The total cost for the repair was approximately 95€.