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.
AIC (Automatic Interval Control)
The automatic interval control (AIC) has the task of controlling the frequency of the wipers in relation to the intensity of the rain and/or the wetness of the windshield. The AIC (rain sensor) is an optical system. The unit transmits infrared light and the reflection of the light back from the windshield is then calculated within the control unit.
In addition to the wiper switch, wiper motor and Body Control Module (BC1) the Automatic Interval Control is made up of the following components:
- AIC optical body (prism)
- Control unit
The AIC optical body, the prism, is firmly stuck to the inner side of the windshield underneath the mirror base attachment and is not a serviceable component; it cannot be removed/refitted in the workshop. Replacement windshields are supplied with the AIC prism already fitted. The prism installation point is selected so that the optics are situated in the wiper's field for both left-hand and right-hand drive vehicles.
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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.
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