B356A

DTC B356A

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy 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 Descriptor
DTC B356A 02
- Vehicle Direction Alert Alarm Warning Switch Circuit Short to Ground




Diagnostic Fault Information






Circuit/System Description

The vehicle alert alarm warning (VDAAW) system consists of a lane departure warning (LDW) module mounted on the windshield. The VDAAW is enabled and disabled through a toggle switch located in the headlamp switch assembly. When enabled, the VDAAW will illuminate the indicator located in the toggle 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 will illuminate 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 must be between 9-16 volts.


Conditions for Setting the DTC

The vehicle direction alert alarm warning (VDAAW) detects a short to ground in the indicator control circuit.


Action Taken When the DTC Sets

* The VDAAW stores the DTC to memory.
* Lane departure system may not operate.



Conditions for Clearing the DTC

* This DTC will change from current to history when the fault is no longer present.
* A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.



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 Park Assist) (Object Detection Description and Operation (Rear Park 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

Programming and Relearning (Programming and Relearning) for scan tool information


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 headlamp switch.
2. Ignition ON, verify the scan tool Mode Switch parameter is Inactive.

• If not the specified value, test the switch control circuit for a short to ground. If the circuit tests normal, replace the VDAAW module.

3. If all circuits test normal, replace the headlamp switch.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Headlamp Switch Replacement (Service and Repair)
* Programming and Relearning (Programming and Relearning) for VDAAW control module replacement, setup and programming