Lane Departure Warning System Malfunction
Lane Departure Warning System Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The vehicle direction alert alarm warning (VDAAW) system is a convenience feature that detects an unintentional lane departure. The VDAAW system informs the vehicle operator of deviation from the road lane markings. The VDAAW system consists of the VDAAW module which includes a camera and an On/Off switch which is a soft key located on the navigation radio system. The VDAAW system receives switch inputs from the navigation radio via the serial data circuit. When the system is working and can detect lane markings, the VDAAW indicator in the IPC illuminates. The VDAAW indicator illuminates green when the system is operating properly and flashes amber when the vehicle crosses a lane marking without the turn signal. An audible warning sounds three times when the amber indicator is flashing. The VDAAW system will not warn the operator if the turn signal is on or if the operator makes a sharp maneuver. The VDAAW system communicates with the IPC via the serial data circuit.
Diagnostic Aids
Certain factors will affect the operation of the lane departure warning system. When the system is operating properly, the green lane departure indicator will illuminate on the IPC. This indicates that all of the required operating conditions to permit lane departure warning have been met. The green lane departure indicator will not appear when the system is having difficulty seeing the lines on the road or if the view of the camera on the windshield is blocked with mud, dirt, snow, ice, or slush, if the windshield is damaged, or when weather limits visibility, such as while driving in fog, rain, or snow conditions. This is normal operation, the vehicle does not need service. Additionally, lane departure warnings may occasionally occur in a properly operating vehicle due to tar marks, shadows, cracks in the road, or other road imperfections. This is normal system operation and the vehicle does not require service. The driver information center (DIC) may also display LANE DEPARTURE SYSTEM UNAVAILABLE due to loss of GMLAN communication or invalid steering wheel position sensor data.
Improper headlamp aiming may reduce the efficiency of the lane departure warning system at night.
Reference Information
Schematic Reference
Object Detection Schematics ([1][2]Collision Avoidance and Parking Assist Systems)
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
Object Detection Description and Operation (UD7) (Object Detection (UD7))Object Detection Description and Operation (UFL) (Object Detection (UFL))Object Detection Description and Operation (UFT) (Object Detection (UFT))
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Testing
Note: Before disconnecting the harness connector at the VDAAW module, ensure that the ignition has been OFF for at least 120 seconds. Failure to do so may result in component damage.
1. Ignition OFF for 120 seconds, disconnect the harness connector at the vehicle direction alert alarm warning module.
2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 4 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 2 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. If all circuits test normal, replace the vehicle direction alert alarm warning module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for vehicle direction alert alarm warning module replacement, programming and setup