Lighting - LED Headlight Fault In Driver Information System
94 A7 LED headlights: Headlight fault in Driver Information System94 12 97
2028947/5
November 20, 2012.
Supersedes Technical Service Bulletin Group 94 number 12-86 dated August 15, 2012 for reasons listed below.
Affected Vehicles
Condition
Customer complaint:
Headlight warning message sporadically appears in DIS.
^ The warning is typically associated with the activation of the static cornering light during low speed turns, or when the turn signal is activated while at a stop.
^ The fault disappears shortly after the cornering light turns off.
Workshop findings:
At least one of the following entries is logged in J519 (09 - central electrics unit control unit):
^ DTC 3813 (Lamp for main beam, right - current coding, implausible signal)
^ DTC 3814 (Lamp for main beam, left - current coding, implausible signal)
^ DTC 3815 (Lamp for dipped beam, right - current coding, implausible signal)
^ DTC 3816 (Lamp for dipped beam, left - current coding, implausible signal)
Only vehicles with full LED headlights (PR No 8EX or 8EY) are affected.
Both headlights remain fully functional during this complaint and still comply with all applicable FMVSS standards.
Technical Background
Software within the LED control module incorrectly calculates the current intensity of the headlight LEDs, leading to the DTC.
Production Solution
New software for LED control modules.
Service
The repair performed will depend on the DTCs currently logged in the vehicle. Replace the control unit or control units associated with the applicable DTCs based on the direction below:
^ DTC 3813 or DTC 3814 (Lamp for main beam - current coding, implausible signal):
^ Replace the high beam LED control module (part number 4G0 907 472A) on the associated side of the vehicle with part number 4G0 907 472C.
^ DTC 3815 or DTC 3816 (Lamp for dipped beam - current coding, implausible signal):
^ Replace the low beam LED control module (part number 4G0 907 472) on the associated side of the vehicle with part number 4G0 907 472B.
Warranty
Required Parts and Tools
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.