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 Descriptors
DTC B0987 01: Vehicle Direction Alert Alarm Warning Indicator Circuit Short to BatteryDTC B0987 04: Vehicle Direction Alert Alarm Warning Indicator Circuit Open
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Vehicle Direction Alert Alarm Warning Module B+ | 1 | 1 | -- | -- |
Lane Departure Warning Switch Signal | B356A 02 | 1 | 1 | -- |
Lane Departure Warning Indicator Control Circuit | 1 | 1 | 1 | -- |
Vehicle Direction Alert Alarm Warning Module Ground | -- | 1 | -- | -- |
1. Lane Departure Warning Malfunction | ||||
Circuit/System Description
The lane departure warning system is controlled by the vehicle direction alert alarm warning (VDAAW) module mounted on the windshield. Lane departure warning is enabled and disabled through a switch located in the headlamp switch assembly. When enabled, the VDAAW module will illuminate the indicator located in the switch.
When the system is operating and can detect the lane markings, the VDAAW module will request via serial data communications that the instrument panel cluster (IPC) illuminate the green lane departure ready-to-assist indicator. If the VDAAW module detects that the vehicle has crosses a lane marking without the turn signal being used, the module will request that the IPC flash the yellow lane departure warning indicator. An audible warning will also sound three times when the yellow IPC indicator is flashing.
Conditions for Running the DTC
Ignition ON
Conditions for Setting the DTC
The VDAAW module has detected an internal failure.
Action Taken When the DTC Sets
| • | Lane departure warning is disabled |
| • | SERVICE LANE DEPARTURE SYSTEM 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
Connector End View Reference
Description and Operation
Object Detection Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Verify DTC B0987 is not set.
Important: When programming the VDAAW, use a Tech 2 and Candi module. Using the MDI to program the VDAAW will result in a failure to complete the programming operation.
| ⇒ | If the DTC is set, perform the Vehicle Direction Alert Alarm Warning Module Programming and Setup procedure. If the DTC resets, replace the VDAAW module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for VDAAW module replacement, setup and programming |
