Vehicle Direction Alert Alarm Warning Malfunction
Vehicle Direction Alert Alarm Warning Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The lane departure warning (LDW) system consists of a vehicle direction alert alarm warning (VDAAW) module mounted on the windshield. The VDAAW is enabled and disabled through a switch located in the headlamp switch assembly. When enabled, the VDAAW will illuminate the indicator located in the switch. A camera located in the LDW module is used to locate lane markings in the road. When the system is working and can detect the lane markings, the VDAAW will illuminate the lane departure warning indicator in the instrument panel cluster (IPC). The IPC indicator will illuminate green when the system is operating properly and flash amber when the vehicle crosses a lane marking without the turn signal being used. An audible warning will also sound three times when the IPC indicator is flashing. The VDAAW system communicates with the IPC via serial data.
Reference Information
Schematic Reference
Object Detection Schematics ([1][2]Collision Avoidance and Parking Assist Systems)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Object Detection Description and Operation (Rear Parking Assist) (Object Detection Description and Operation (Rear Parking Assist))Object Detection Description and Operation (VDAAW) (Object Detection Description and Operation (VDAAW))Object Detection Description and Operation (SOD) (Object Detection Description and Operation (SOD))
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Mode Switch parameter while cycling the lane departure warning switch. The parameter should change between Active and Inactive.
2. Observe the scan tool Mode LED parameter while pressing the lane departure warning switch. The parameter should change between On and Off.
Circuit/System Testing
Important: 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 VDAAW module.
2. Ignition OFF, vehicle doors closed, test for less than 5.0 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 that 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. Ignition OFF for 120 seconds, connect the harness connector at the VDAAW module. Disconnect the harness connector at the headlamp switch.
5. Ignition ON, verify the scan tool Mode Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the VDAAW module.
6. Install 3A fused jumper wire between the signal circuit terminal 9 and ground. Verify the scan tool Mode Switch parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the VDAAW module.
7. Ignition OFF, connect the harness connector at the headlamp switch.
8. Ignition ON, observe the scan tool Mode Switch parameter while cycling the lane departure warning switch. The parameter should change between Active and Inactive.
• If the parameter does not change between the specified values, replace the headlamp switch.
9. Observe the scan tool Mode LED parameter while cycling the lane departure warning switch. The parameter should change between On and Off.
• If the parameter does not change between the specified values, replace the VDAAW module.
10. Observe the mode LED while cycling the lane departure warning switch. The LED should turn ON and OFF when cycling between the commanded states.
• If the LED is always OFF, test the control circuit terminal 16 at the headlamp switch harness connector for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, test or replace the headlamp switch.
11. If all circuits test normal, replace the VDAAW module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Headlamp Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for VDAAW module replacement, setup and programming