Lighting - One Or More DRL LEDs Are Inoperative
94 One or more Daytime Running Light LEDs in one headlight assembly are inoperative
94 10 29
2020780/6
August 2, 2010
Supersedes Technical DIAGNOSIS AND REPAIR Group 94 number 10-18 dated June 4, 2010 for reasons listed below.
Affected Vehicles
642
Condition
One or more Daytime Running Light (DRL) LEDs in one headlight assembly are inoperative.
Technical Background
Two possible causes:
^ LED circuit board.
643
^ DRL control unit, located inside the headlight assembly.
Production Solution
Improved soldering of the LED circuit board after VIN 8R_9A019111 (MY 2009).
Redesign of DRL control unit electronics between VIN FP_AA037500 and FP_AA054981 (MY 2010).
New supplier for headlight assemblies and DRL control unit after VIN FP_AA054982 (MY 2010).
Service
^ If 1 to 11 individual LEDs do not operate, replace the headlight.
^ If all 12 LEDs do not operate, perform the following:
In order to verify the root cause, swap the DRL control unit from the headlight with the inoperative LEDs with the DRL control unit of the
operative headlight.
^ If the problem follows, replace the DRL control unit(s).
^ If the problem does not follow, replace the headlight with the inoperative LEDs according to the table above.
644
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.
