Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
E46 - Rain-Light Sensor: Layout
The rain-light sensor is an optical system consisting of the rain sensor, the driving lights sensor and an electronic evaluation unit.
The rain sensor comprises
- Optical element: the optical element is affixed to the windscreen.
- Electronics unit: the electronics unit houses 4 optical transmitter and 4 receiver diodes in addition to the evaluation electronics.
- Heating: an integrated heating system prevents the optical element and the diodes from misting over.
The driving light sensor consists of 2 photodiodes and an electronic evaluation unit.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.