B0987
DTC B0987
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.
DTC Descriptors
DTC B0987 01
- Vehicle Direction Alert Alarm Warning Indicator Circuit Short to Battery
DTC B0987 04
- Vehicle Direction Alert Alarm Warning Indicator Circuit Open
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.
Conditions for Running the DTC
The system voltage is between 9-16 volts.
Conditions for Setting the DTC
B0987 01
The VDAAW detects a short to battery on the indicator control circuit.
B0987 04
The VDAAW detects an open on the indicator control circuit.
Action Taken When the DTC Sets
* The VDAAW module disables the system.
* The SERVICE LANE DEPARTURE SYSTEM message is displayed on the DIC.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.
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 Testing
1. Ignition ON, 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.
2. 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.
3. 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