Lighting - Different Color Shades In LED DRL's
94 Different color shades in LED daytime running lights
94 10 26
2023322/2
July 1, 2010
Supersedes Technical DIAGNOSIS AND REPAIR Group 94 number 10-16 dated June 2, 2010 for reasons listed below.
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 609
Affected Vehicles
Condition
The customer may report that the daytime running light LEDs in the headlights have slightly different shades of color. There is no related memory
entry.
Technical Background
The minor color differences of the LEDs are caused by the coating of the blue LED with yellow phosphor. This coating is necessary to get white
LEDs.
A permissible range of white for the road traffic is defined by law (Figure 1, Area 1 within blue dotted line).
The LED manufacturer sorts the complete production volume according to even smaller color ranges (Figure 1, Area 2 in black grid).
To get the fewest possible color deviations, Audi uses only part of the manufacturer's already limited range and thus only a small section of what is
legally permissible for road traffic (Figure 1, Area 3).
In production, a finer color selection is not possible; this can lead to minimal color differences. This is normal.
Production Solution
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Service
Audi A4 Quattro Sedan (8K2) L4-2.0L Turbo (CAEB) Page 610
Please explain the Technical Background to the customer. Do not carry out any repairs.
Warranty
This TSB is informational only and not applicable to any Audi warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service
manuals for the latest information.
