NHTSA ID Number: 10165865
Manufacturer Communication Number: PIT5481E
TSB/Document Date: 2019-10-15
Summary
This Preliminary Information communication provides information to the technician with additional information on the functionality of Lane Keep Assist.Starting with2016 model year Lane Keep Assist Regular Production Option Code (UHX) replaced Lane Departure Warning Regular Production Option Code (UFL). Lane Keep Assist is designed to assist the driver in keeping the vehicle from drifting out of a driving lane that has clearly identified markings. The electric power steering provides a gentle steering correction if a lane marking has been crossed and the driver has not actively responded.
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TSB/Document ID: PIT5481E
Replacement Service Bulletin Number:
MFR Communication Date: 2019-09-04
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STEERING
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Bulletin No.: PIT5481E
Published date: 09/4/2019
Preliminary Information
PIT5481E Diagnostic Tip - Lane Keep Assist and Lane Departure
Warning Functionality
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Enclave
2018 - 2020
All
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Envision
2016 - 2020
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Escalade Models
2016 - 2020
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All
XT4
2019 - 2020
All
All
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All
Blazer
2019 - 2020
All
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All
Equinox
2018 - 2020
All
All
All
All
Silverado 1500
2016 - 2020
All
All
All
All
Suburban
2016 - 2020
All
All
All
All
Tahoe
2016 - 2020
All
All
All
All
Traverse
2018 - 2020
All
All
All
All
Sierra 1500
2016 - 2020
All
All
All
All
Terrain
2018 - 2020
All
All
All
All
Yukon Models
2016 - 2020
All
All
All
All
With Lane Keep Assist (RPO UHX)
Supersession Statement
This PI was superseded to update the models, years and Condition\Concerns,
Recommendation sections. Please discard PIT5481D.
This PI is to provide additional information on the functionality of Lane Keep Assist and why
customers may not get a lane departure warning alert (audible chime or safety alert seat
vibration) when they cross a lane marker.
The Lane Keep Assist system (RPO UHX) replaced the Lane Departure Warning system (RPO
UFL) starting with the 2016 model year. The Lane Keep Assist system incorporates the
functionality of the Lane Departure Warning system, but it works slightly different when
compared to a vehicle that does not have Lane Keep Assist. Lane Keep Assist is designed
to assist the driver in keeping the vehicle from drifting out of a driving lane that has clearly
identified lane markings. The electric power steering provides a gentle steering correction if
a lane marking has been crossed and the driver has NOT actively responded (i.e. steering,
accelerating, braking, use of turn signal). In situations where the steering corrections does
not keep the vehicle from crossing the lane marker and the driver has NOT actively
responded (ie. steering, accelerating, braking, use of turn signal), the Lane Departure
Warning may activate and provide an alert (chime or safety alert seat vibration) to the
driver.
If the driver tries to "test" the Lane Departure Warning alert and over comes the Lane Keep
Assist correction so the vehicle intentionally crosses the lane marker, the system may
interpret this as an active response, and in many cases, the system will NOT provide an
alert. Therefore, alerts do NOT occur as often with Lane Keep Assist when compared to the
Lane Departure Warning system used in the previous model year vehicles.
For Lane Keep Assist to start providing assist, the following criteria must be met:
-Vehicle speed between 38 mph and 111 mph
-Lane markings are clearly visible
-Lane Keep Assist is turned "on" via the enable/disable button located on the dash. When
enabled, the LED on the button will illuminate.
-Lane marker width meets Lane Keep Assist criteria (not too wide or narrow)
-Lane marker radius meets Lane Keep Assist criteria (curve is not too tight)
When the criteria listed above is met, the Lane Keep Assist icon will illuminate, as seen in
the photo below.
The Lane Keep Assist icon has several different indication modes:
- Solid green indicates the system is ready to assist.
- Solid amber indicates Lane Keep Assist intervention is occurring.
- Flashing amber indicates a Lane Departure Warning alert (chime or safety seat vibration)
- Lane Keep Assist and Lane Departure Warning alerts are suppressed with any deliberate
driver response (ie. steering, accelerating, braking, use of turn signal, see below)
Drivers can suppress/override Lane Keep Assist with the following deliberate maneuvers:
- Turning the steering wheel
- Braking
- Accelerating
- Turn signal is on in the direction of the lane crossing
Proper operation may be affected by factors outside the vehicle, including:
- Nearby vehicles ahead (tailgating)
- Sudden lighting changes, such as going through a tunnel
- Banked roads
- Poor lane markings, such as on some two-lane roads
- Snow, frost, ice, dirt, mud, bugs, etc on the windshield that are blocking the front camera
- Tar marks, cracks, shadows, temporary lane markings and other road imperfections
- Lane markings on one side of the road only (Lane Keep Assist provides assist only on the
side with markings).
The driver is advised to turn off the system when these conditions are present; this does not
indicate a system failure.
In addition, do not use Lane Keep Assist while towing a trailer or on a slippery road, as this
may cause a loss of vehicle control.
© 2019 General Motors
. All Rights Reserved.
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