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AV-SCANNER / Service function guides / Body and comfort
This guide covers the complete diagnostic procedure for heated seats and heated mirrors, from understanding the electrical circuit to testing every component with a multimeter. It is written for working mechanics and experienced DIYers who need a repeatable, safe method that works across most vehicle makes. After reading, you will be able to trace a heating fault from the switch to the element, interpret voltage drops and resistance readings, and confirm a repair with measurable results. The guide also prepares you for common variations such as timer modules, thermistors, and seat occupancy interlocks.
Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.
Download all 12 sections as a branded PDF to use in the workshop.
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