A4 Quattro Sedan L4-2.0L Turbo (BPG) (2005)
Headlamp Control Module: Customer Interest
Lighting - DTC 01771/Headlamp Range Control Warning
94 Adaptive Lighting, Headlight Range Control Warning
94 09 16
2011041/7
June 17, 2009.
Supersedes Technical Service Bulletin Group 94 number 09-09 dated March 23, 2009 for reasons listed below.
Affected Vehicles
Condition
-
Headlight range control warning is on in the driver information display. After cycling the ignition, warning symbol is off again.
-
DTC 01771 (Control module for vertical headlight aim control system -J431- implausible signal) is stored in the headlight range control module,
address word 55.
-
The adaptive lighting system otherwise functions properly.
Technical Background
Communication between the headlight range control module and both headlight power output stages (Xenon igniter control unit) is briefly interrupted.
Production Solution
New control module with updated software installed.
Service
Check part number of control unit.
-
Control units with part number 4F0 907 357 or 4F0 907 357A cannot be updated and must be replaced.
-
Vehicles with the control unit 8P0 907 357 (all indexes) are not affected.
-
All other part numbers, follow SVM Update Instructions below.