PIT5481E
Service Bulletin Details
Public Details for: PIT5481E
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) repl
- 2020 - 2019 - 2018 - 2017 - 2016 -
Models from 2020
Models from 2019
Models from 2018
Models from 2017
| 2017 BUICK ENVISION |
| 2017 CADILLAC ESCALADE ESV |
| 2017 CHEVROLET SILVERADO 1500 |
| 2017 CHEVROLET SUBURBAN |
| 2017 CHEVROLET TAHOE |
| 2017 GMC SIERRA 1500 |
| 2017 GMC YUKON DENALI |
Models from 2016
| 2016 BUICK ENVISION |
| 2016 CADILLAC ESCALADE ESV |
| 2016 CHEVROLET SILVERADO 1500 |
| 2016 CHEVROLET SUBURBAN |
| 2016 CHEVROLET TAHOE |
| 2016 GMC SIERRA 1500 |
| 2016 GMC YUKON DENALI |
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: Buick Enclave 2018 - 2020 All All All All Buick Envision 2016 - 2020 All All All All Cadillac Escalade Models 2016 - 2020 All All All All Cadillac XT4 2019 - 2020 All All All All Chevrolet Blazer 2019 - 2020 All All All All Chevrolet Equinox 2018 - 2020 All All All All Chevrolet Silverado 1500 2016 - 2020 All All All All Chevrolet Suburban 2016 - 2020 All All All All Chevrolet Tahoe 2016 - 2020 All All All All Chevrolet Traverse 2018 - 2020 All All All All GMC Sierra 1500 2016 - 2020 All All All All GMC Terrain 2018 - 2020 All All All All GMC Yukon Models 2016 - 2020 All All All All With Lane Keep Assist (RPO UHX) Supersession Statement This PI was superseded to update the models, years and Condition\Concerns, Recommendation sections.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.