Lighting - Automatic Lights Switch OFF Too Late

DRIVING LIGHTS SWITCH OFF TOO LATE OR ON TOO EARLY (BLUE SKY EFFECT)

Topic Number LI82.10-P-047936

Version 1

Design Group 82.10 Exterior lights

Date 09-10-2009

Validity Models 203 as of 06/2003, 169, 245, 215, 216, 209, 219, 211, 164, 251, 220, 221, 230, 171. With rain/light sensor (RLS)

Reason for change

Reason for block

Complaint:

The customer complains that, under a cloudless, blue sky (away from direct sunlight), the driving lights switch off too late when the rotary light switch is in the "Auto" (automatic) position.

Cause:

Under a blue sky, the sensor interprets the ambient brightness as being too dark due to its physical operating principle (blue sky effect). The reason for this is that the sensor measures light in the infrared range, and range of light occurs less then usual under a cloudless sky.

Remedy:

Please advise the customer of the technical limitations in this special situation.

NOTE:
Replacement of the rain/light sensor (RLS) is not justified and does not remedy the complaint!





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