Chevrolet Trax: Lane departure warning system malfunction

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.

Diagnostic Fault Information

Circuit/System Description

The lane departure warning system is enabled and disabled through the lane departure switch. When enabled, the lane departure warning indicator will illuminate. The switch and indicator are connected to the frontview camera module. The frontview camera module supplies a reference voltage to the lane departure switch. When the switch is pressed, the signal circuit is grounded. When enabled, the frontview camera module will illuminate the indicator located in the switch when lane departure warning system is enabled.

When the system is operating and can detect the lane markings, the frontview camera module will request via serial data communications that the instrument cluster illuminates the green lane departure ready-to-assist indicator. If the frontview camera module detects that the vehicle unintentionally crosses a lane marking without the turn signal being used, the module will request the vehicle direction display to flash the amber lane departure warning indicator. An audible warning will also sound three times when the amber lane departure warning indicator in the vehicle direction display is flashing.

Diagnostic Aids

Certain factors will affect the operation of the lane departure warning system. When the system is operating properly, the green lane departure warning indicator will illuminate on the instrument cluster. This indicates that all of the required operating conditions to permit lane departure warning have been met. The green lane departure warning indicator will not appear when the system is having difficulty seeing the lines on the road or if the view of the front view camera is blocked with mud, dirt, snow, ice, or slush, if the windshield is damaged, or when weather limits visibility, such as while driving in fog, rain, or snow conditions. This is normal operation, the vehicle does not need service. Additionally, lane departure warnings may occasionally occur in a properly operating vehicle due to tar marks, shadows, cracks in the road, or other road imperfections. This is normal system operation and the vehicle does not require service. The driver information center may also display Lane Departure System Unavailable due to the temporary conditions listed above.

Additionally, the Front View Camera Disable History can give useful hints about what affected the operation of the lane departure warning system. For the Front View Camera Disable History, refer to DTC B1011.

Reference Information

Schematic Reference

Object Detection Schematics (Encore), Object Detection Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Object Detection Description and Operation (Rearvision Camera, UVC), Object Detection Description and Operation (Rear Park Assist, UD7), Object Detection Description and Operation (Side Blind Zone Alert, UFT), Object Detection Description and Operation (Rear Cross Traffic Alert, UFG)

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

NOTE: Refer to Diagnostic Aids before performing Circuit/System Verification.

1. Ignition ON.
2. Verify that DTC B356A is not set.

• If the DTC is set

Refer to DTC B356A.

• If the DTC is not set

3. Verify that DTC B0987 is not set.

• If the DTC is set

Refer to DTC B0987.

• If the DTC is not set

4. Verify the scan tool Frontview Camera System Status parameter is Normal.

• If the parameter is Undefined or Malfunction

Refer to Diagnostic Aids.

• If the parameter is Normal

5. Verify the scan tool Lane Departure Warning Switch Status parameter changes between Open and Closed while pressing and releasing the lane departure warning switch

• If the parameter does not change between Open and Closed

Refer to Lane Departure Warning Switch Malfunction in Circuit/System Testing.

• If the parameter changes between Open and Closed

6. Verify the scan tool Lane Departure Warning Switch indicator turns on and off while pressing and releasing the lane departure warning switch

• If the indicator does not turn on and off

Refer to Lane Departure Warning Switch Indicator Malfunction in Circuit/System Testing.

• If the indicator turns on and off

7. Verify the area of the K109 Frontview Camera Module for contamination

• If it needs to be cleaned
• If it does not need to be cleaned

8. All OK.

Circuit/System Testing

Lane Departure Warning Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 9 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 Lane Departure Warning Switch Status parameter is Open.

• If not Open

1. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module.
2. Test for infinite resistance between the S48E Multifunction Switch - Center Console signal circuit terminal 7 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 Open

5. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
6. Verify DTC B356A 02 sets in approximately 10s.

• If DTC does not set

1. Ignition OFF, remove the jumper wire, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
2. Test for less than 1 V between the signal circuit 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 DTC sets

7. Test or replace the S48E Multifunction Switch - Center Console.

Lane Departure Warning Switch Indicator Malfunction

1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console, ignition ON.
2. Test for 9.1 - 12.6 V between the dimming control circuit terminal 8 and ground.

NOTE: Verify interior lighting dimming is turned all the way up.

• If less than 9.1 V

1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the control circuit and ground.

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

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

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, refer to Interior Backlighting Malfunction .
• If greater than 12.6 V

1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, refer to Interior Backlighting Malfunction .
• If between 9.1-12.6 V

3. Ignition OFF, disconnect the harness connector at the K109 Frontview Camera Module, ignition ON.
4. Test for less than 1 V between the control circuit terminal 6 and ground.

• If 1 V or greater

Repair the short to voltage on the circuit.

• If less than 1 V

5. Ignition OFF.
6. Test for infinite resistance between the control circuit terminal 6 and ground.

• If less than infinite resistance

Repair the short to voltage on the circuit.

• If less than 1 V

5. Ignition OFF.
6. Test for infinite resistance between the control circuit terminal 6 and ground.

• If less than infinite resistance

Repair the short to ground on the circuit.

• If infinite resistance

7. Test for less than 5 ohms between the K109 Frontview Camera Module terminal 4 and S48E Multifunction Switch - Center Console circuit terminal 6.

• If greater than 5 ohms

Repair the open/high resistance in the circuit.

• If less than 5 ohms

8. Test or replace the S48E Multifunction Switch - Center Console.
9. Verify the lane departure switch Indicator turns ON and OFF when pressing and releasing the lane departure warning switch.

• If indicator does not turn on and off

Replace K109 Frontview Camera Module

• If indicator turns on and off

10. All OK.

Component Testing

Lane Departure Switch

1. Ignition OFF, disconnect the harness connector at the S48E Multifunction Switch - Center Console.
2. Test for infinite resistance between the signal terminal 7 and the ground terminal 9 with the switch in the open position.

• If less than infinite resistance

Replace the S48E Multifunction Switch - Center Console.

• If infinite resistance

3. Test for 3.9k - 5.8k ohms between the signal terminal 3 and the ground terminal 9 with the switch in the closed position.

• If not between 3.9k - 5.8k ohms

Replace the S48E Multifunction Switch - Center Console.

• If between 3.9k - 5.8k ohms

4. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Accessory Switch Replacement (Encore) , Accessory Switch Replacement (Trax)
• Control Module References for frontview camera module replacement, programming and setup.

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