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B356A




DTC B356A

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.

DTC Descriptors

DTC B356A 02
- Vehicle Direction Warning Switch Circuit Short to Ground

DTC B356A 05
- Vehicle Direction Warning Switch Circuit Short to Voltage

Diagnostic Fault Information






Circuit/System Description

The lane departure warning system is controlled by the Frontview Camera Module mounted on the windshield. Lane departure warning is enabled and disabled through a switch located in the instrument panel. When enabled, the Frontview Camera Module will illuminate the indicator located in the switch.

When the system is operating and can detect the lane markings, the Frontview Camera Module will request via serial data communications that the instrument panel cluster illuminate the green lane departure ready-to-assist indicator. If the Frontview Camera Module detects that the vehicle has crossed a lane marking without the turn signal being used, the module will request that the Instrument Cluster flash the yellow lane departure warning indicator. An audible warning may also sound three times or the haptic seat (if equipped) may pulse when the yellow Instrument Cluster indicator is flashing. The driver can select between audible or haptic alerts in the vehicle personalization menu. See the Owner's Manual for more detailed information on vehicle personalization.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

DTC B356A 02

The Frontview Camera Module has detected a short to ground for more than 10 s.

DTC B356A 05

The Frontview Camera Module has detected a short to voltage or an open/high resistance for more than 10 s.

Action Taken When the DTC Sets

* Lane departure warning is disabled.

* Service Lane Departure is displayed on the driver information center.

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.

Diagnostic Aids

Manually depressing the Lane Departure Warning Switch for an extended length of time will cause this DTC to set.

Reference Information

Schematic Reference

Object Detection Schematics [1][2]Collision Avoidance and Parking Assist Systems

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Object Detection Description and Operation (with Active Safety System - UGN) Object Detection Description and Operation (with Active Safety System - UGN)Object Detection Description and Operation (with rear vision camera - UVC) Object Detection Description and Operation (with rear vision camera - UVC)Object Detection Description and Operation (with front and rear park assist - UD5) Object Detection Description and Operation (With Front and Rear Park Assist - UD5)Object Detection Description and Operation (with rear park assist - UD7) Object Detection Description and Operation (With Rear Park Assist - UD7)Object Detection Description and Operation (with side blind zone alert - UFT) Object Detection Description and Operation (with side blind zone alert - UFT)Object Detection Description and Operation (with rear cross traffic alert - UFG) Object Detection Description and Operation (With Rear Cross Traffic Alert - UFG)Object Detection Description and Operation (with lane departure warning - UFL) Object Detection Description and Operation (With Lane Departure Warning - UFL)Object Detection Description and Operation (with forward collision alert - UEU) Object Detection Description and Operation (With Forward Collision Alert - UEU)Object Detection Description and Operation (with Haptic Signal Motor Seat) Object Detection Description and Operation (with Haptic Signal Motor Seat)

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 Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool Vehicle Direction Warning Switch Status parameter changes between On and Off while cycling the Lane Departure Warning Switch.

• If the parameter does not change
Refer to Circuit/System Testing.

• If the parameter changes

3. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48C Multifunction Switch 1- Instrument Panel. It may take up to 2 minutes for all vehicle systems to power down.

2. Test for less than 10 ohms between the ground circuit terminal 5 and ground.

• If 10 ohms or greater

1. Test for less than 2 ohms in the ground circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, repair the open/high resistance in the ground connection.

• If less than 10 ohms

3. Ignition ON.

4. Verify the scan tool Vehicle Direction Warning Switch Status parameter is Off.

• If not Off

1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.

2. Test for infinite resistance between the S48C Multifunction Switch 1- Instrument Panel signal circuit terminal 6 and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K109 Frontview Camera Module.

• If Off

5. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground circuit terminal 5.

6. Verify within 10 s the scan tool Vehicle Direction Warning Switch Status parameter is On.

• If not On

1. Ignition OFF, disconnect harness connector at the K109 Frontview Camera Module. Ignition ON.

2. Test for less than 1 V between the S48C Multifunction Switch 1 - Instrument Panel signal circuit terminal 6 and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V.

3. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K109 Frontview Camera Module.

• If On

7. Test or replace the S48C Multifunction Switch 1- Instrument Panel.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Interior Lamp and Multifunction Switch Replacement Interior Lamp and Multifunction Switch Replacement

* Control Module References Control Module References for Frontview Camera Module replacement, programming, and setup.

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