S 55 AMG (220.174) V8-5.5L SC (113.991) (2004)
Daytime Running Lamp: Technical Service Bulletins
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!
Symptoms
Work Units