PIT5781

Bulletin No.: PIT5781
Published date: 09/28/2020
Preliminary Information
PIT5781 Service Headlamp message on the DIC
Models
Brand:
Buick
Model:
Envision
Involved Region or Country:
Additional RPO/s:
Condition:
Cause:
Model Years:
2021
VIN:
from
All
Engine:
to
All
All
Transmissions:
All
China - SGM
TR7 (w/o F45)
Customers see Service Headlamp message on the DIC.
This issue will result in the Adaptive Forward Lighting (AFL) setting DTCs
C103D.11, C103D.16 and C103D.17 against the position sensor input and will
command headlamps into failsafe. The chassis position sensors have a +/- 10%
tolerance on the carrying frequency (the frequency that the Pulse Width
Modulation (PWM) is determined within), the AFL allows for only +/- 5%
tolerance. Therefore, a sensor that is outside of the +/- 5% tolerance, will result
in the AFL setting DTCs against the position sensor input and will command
headlamps into failsafe. This seems to be temperature sensitive, the sensor
reads higher mainly on cold starts and when it is a colder day may linger longer.
The AFL will recover as soon as the sensors come back within the +/- 5 AFL
tolerance, normal leveling will resume, DTCs will go to history, and DIC will go
away – will not require a new ignition cycle to recover.
Correction:
Reprogram the AFL Module with software part number 84993226.
Warranty Information
For vehicles repaired under the Bumper-to-Bumper coverage (Canada Base Warranty coverage), use the following
labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage
information.
Labor Operation:
Description:
Use Published Labor Operation
Reprogram the AFL Module
Version History
Version
Modified
1
09/28/2020 - Created on.
© 2020 General Motors. All Rights Reserved.
Labor Time:
Use Published Labor Time