Buick Regal: Symptoms - Driver Assistance Systems
NOTE: The following steps must be completed before using the symptom
tables:
1. Perform the Diagnostic System Check - Vehicle before using the Symptom
Tables in order to
verify that all of the following are true: before using the Symptom Tables in
order to verify that all
of the following are true:
- There are no DTCs set.
- The control modules can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the
system functions:
- Lane Departure Warning Description and Operation
- Lane Keep Assist Description and Operation
- Cross Traffic Alert Description and Operation
- Side Blind Zone Alert Description and Operation
- Forward Collision Alert Description and Operation
Visual/Physical Inspection
Intermittent
- Faulty electrical connections or wiring may be the cause of intermittent
conditions. Refer to Testing for Intermittent Conditions and Poor
Connections.
Symptom List
- Forward Collision Alert System Malfunction
- Rear Cross Traffic Alert System Malfunction
- Side Blind Zone Alert System Malfunction
- Lane Departure Warning System Malfunction
- Lane Keep Assist System Malfunction
Adaptive Cruise Control Malfunction
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
- Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
Diagnostic Fault Information
1. Adaptive Cruise: Temporarily Unavailable or ACC TEMP UNAVAILABLE Message
Displayed
2. Lane Departure Warning: Unavailable or Lane Keeping Assist: System
Unavailable LKA
UNAVAILABLE or LDW UNAVAILABLE Message Displayed
3. Service Driver Assist Message Displayed
Circuit/System Description
Adaptive Cruise Control Description and Operation
Diagnostic Aids
System Disabled possible reasons
- Switchable cruise control (if equipped): Verify the Adaptive Cruise
Control is enabled by
observing the corresponding indicator and message in the Driver Information
Display. Switch
between ACC and Regular Cruise Control by pressing and holding the Cancel
switch
- B233B Radar Sensor Module - Long Range Mounting/Alignment: For (some)
vehicles the
"SERVICE DRIVER ASSIST SYSTEM" message can be displayed without a DTC being
set,
when the long range radar gets misaligned. Inspect the long range radar for
proper
mounting/alignment. In most cases, a mounting/alignment issue may be caused
by a front end
impact/collision that may or may not be obvious. Physically check the Long
Range Radar Module
bracket for damage and make sure it is in alignment. Place the vehicle on a
level surface. Use an
angle gauge/level to make sure the bracket is mounted 90 degrees (+/- 3
degrees). After the Long
Range Radar Module alignment has been checked and/or corrected, perform the
Radar Sensor
Module - Long Range Learn
- K109 Frontview Camera Module Mounting: Inspect the front view camera
sensor, on the
windshield near the inside rearview mirror, to make sure it is attached
properly to the windshield.
Calibrate the front camera module after repair. Refer to Front View Camera
Module Learn
- Visually inspect the vehicle for any aftermarket add on equipment like
bug deflectors, windshield
tint/banners, grille emblems, push bars, license plates, etc. These items
could block the
radar/camera's view. Question the customer to see if this concern started
after the installation of
the aftermarket equipment. Remove any aftermarket items and retest system
for proper operation.
- The radars and front camera are continuously monitoring for a blocked
condition and if it
determines its ability to "see" clearly is compromised, the radar/camera may
become unavailable.
When this occurs, the cruise will disengage and/or no cruise engagement with
an "Adaptive
Cruise: Temporarily Unavailable" message. Since the radars cannot visually
"see" they rely on a
complex blockage detection algorithm to predict blockage. Also, keep in mind
that the front
camera cannot see through objects or debris, so the camera can become
visibly blocked. It is
important to understand that disabling the adaptive cruise control, as a
result of sensor blockage, is
a normal function of the system and is intended to protect the driver from
compromised system
performance. Blockage detection is needed because if the radars/camera
were/was truly blocked,
the adaptive cruise control would not function properly.
- Foul weather: Foul weather such as snow, ice, heavy rain, road spray
conditions may limit the
sensors ability to "see". Also, a buildup of mud, snow, frost, dirt, bugs,
etc on the windshield or
front fascia can cause a blockage. This buildup can also occur on the back
side of the fascia
between the radar and back of fascia. One example, if the windshield has a
buildup of
frost/snow/ice which covers the front camera, the system may detect a
blockage and disable the
cruise. After the defroster warms the windshield and melts away the
frost/snow/ice the system will
become operational. This example may appear to be an intermittent issue.
- If driving in 4WD HI range (if equipped), adaptive cruise control will
be disabled, which is
normal. (Adaptive cruise control will function in Auto 4WD.)
Dark Rural Areas: In very dark rural areas, the front view camera may de
- ect blockage.
- Very High Ambient Temperatures: Very high ambient temperatures may
affect camera operation.
- Barren Environments: As part of the blockage detection algorithm, the
radar may conclude it is
blocked if the radar does not "see" anything over a period of time. This can
happen when driving
in very bare environments, such as deserts and rural areas where there are
no large objects to
detect like other vehicles, bridges, building, trees, signs, mail boxes,
guard rails, etc. Below is an
example photo of an area where the radar may determine a blockage because
there are no objects
in the environment for the radar to "see". In these cases, if the system
does not detect an object
within approximately 60 seconds or 1.2 miles (2 km) the cruise will be
disengaged and a
"ADAPTIVE CRUISE TEMPORARILY UNAVAILABLE" message. If there were other
vehicles
on the road for the radar to detect there would not be any issues.
Reference Information
Schematic Reference
Driver Assistance Systems Wiring Schematics
Connector End View Reference
Master Electrical Component List
Description and Operation
Adaptive Cruise Control Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify there are no other DTCs set and that there are no communication DTCs
set in the vehicle.
Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no DTC's are set
3. Verify the Active Safety Control Module scan tool parameter Adaptive
Cruise Control Inhibit
History Data 1-6 and Adaptive Cruise Control Disengage History Data 1-6 indicate
no current
malfunction. Refer to K124 Active Safety Control Module: Scan Tool Information
- If not the specified state
Diagnose the system that sets the malfunction.
- Go to next step: If the specified state
4. Verify the scan tool parameter: B233B Radar Sensor Module - Long Range -
Long Range Radar
Sensor Module Misaligned - Angled Down = No
- If the parameter does not display the following: Long Range Radar
Sensor Module
Misaligned - Angled Down = No
Align the B233B Radar Sensor Module - Long Range and perform the Radar
Sensor
Module - Long Range Learn
- Go to next step: If the parameter displays the following: Long Range
Radar Sensor
Module Misaligned - Angled Down = No
5. Verify the scan tool parameter: B233B Radar Sensor Module - Long Range -
Long Range Radar
Sensor Module Misaligned - Angled Left = No
- If the parameter does not display the following: Long Range Radar
Sensor Module
Misaligned - Angled Left = No
Align the B233B Radar Sensor Module - Long Range and perform the Radar
Sensor
Module - Long Range Learn
- Go to next step: If the parameter displays the following: Long Range
Radar Sensor
Module Misaligned - Angled Left = No
6. Verify the scan tool parameter: B233B Radar Sensor Module - Long Range -
Long Range Radar
- Sensor Module Misaligned - Angled Right = No
If the parameter does not display the following: Long Range Radar Sensor
Module
Misaligned - Angled Right = No
Align the B233B Radar Sensor Module - Long Range and perform the Radar
Sensor
Module - Long Range Learn
- Go to next step: If the parameter displays the following: Long Range
Radar Sensor
Module Misaligned - Angled Right = No
7. Verify the scan tool parameter: B233B Radar Sensor Module - Long Range -
Long Range Radar
Sensor Module Misaligned - Angled Up = No
- If the parameter does not display the following: Long Range Radar
Sensor Module
Misaligned - Angled Up = No
Align the B233B Radar Sensor Module - Long Range and perform the Radar
Sensor
Module - Long Range Learn
- Go to next step: If the parameter displays the following: Long Range
Radar Sensor
Module Misaligned - Angled Up = No
8. Verify the scan tool parameter: K109 Frontview Camera Calibration Status =
Calibrated. Refer to
K109 Frontview Camera Module: Scan Tool Information
- If not the specified state
Perform the following learn procedure: Front View Camera Module Learn
- Go to next step: If the specified state
9. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Diagnostic
System Check - Vehicle
Review the description of Strategy Based Diagnosis: Strate
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptor
DT
Calibration (without UGN)
NOTE: Do NOT swap cameras between vehicles, it is not approved and a
VIN
mismatch will occur.
The calibration process for the front view camera system is necessary when a
front view camera module
is replaced by a new one. This process is required anytime the module is rem