Rain/Light Sensor

Rain/Light Sensor (RLS)

The Rain/Light Sensor is standard equipment, it is installed below the base of the rear view mirror as in other models.




The rain/driving light sensor in the E65/E66 is an improved version of the first-generation rain sensor.

An additional driving light sensor is integrated into the rain/driving light sensor.

This function is described separately in vehicle lighting.

Modifications from the first-generation rain sensor:

- There are now 4 optical measurement sections instead of 2 which provides improved identification of dirt, salt etc..
- Integration of the light sensor function.
- K-CAN-S interface Flash Programmable EEPROM.

The measuring principle of the RLS is identical to that of the previous rain sensor (AIC, automatic interval control).

The rain detection function is based on the principle of total reflection against the glass-to-air boundary surface:

- When the windshield is clean and dry, the infrared light transmitted by the raid driving light sensor is fully reflected.
- When the windshield is wet or dirty in the area of the reflective surfaces, the conditions for total reflection no longer exist. As a result, less light is reflected.




This change in the signal is evaluated by a microprocessor in the Rain/Light sensor (together with other signals, e.g. speed).

If necessary, a message is sent to the wiper module via the K-CAN S

The wiper module then:

- Activates the wipe operation
- Determines the wiper speed and the interval duration