Chevrolet Trax: Front view camera module malfunction (forward collision alert - UEU)

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 forward collision alert system is controlled by the front view camera module mounted on the windshield.

The forward collision alert system is always active and operates at speeds above 40 km/h (25 mph). When the system detects a vehicle in the path ahead, the green vehicle ahead alert indicator in the instrument cluster is illuminated. When approaching another vehicle too rapidly, the collision alert symbol will flash in the instrument cluster and the radio will simultaneously give an audible alert sound. The red collision alert display will stay continuously illuminated if the vehicle ahead remains much too close. These actions are requested by the front view camera module via serial data to the instrument cluster. The forward collision alert switch is part of the left steering wheel controls and is used to adjust the timing sensitivity of the front collision alert system

Diagnostic Aids

Certain factors will affect the operation of the forward collision alert system. Forward collision alert does not warn the driver of any objects that are not detected as a vehicle, like e.g. pedestrians, animals, signs, guard rails, bridges, construction barrels or other stationary or slow moving objects. In some cases the camera may detect a vehicle that is not in the path ahead, or the system may occasionally provide unrealistic alerts. This could respond to a turning vehicle ahead, guard rails, traffic signs, or other stationary objects. This is normal operation, the vehicle does not need service. When the system is operating properly, the green vehicle ahead alert indicator will illuminate on the vehicle direction display when the system detects a vehicle in the path ahead. This indicates that all of the required operating conditions are met. The green vehicle ahead alert indicator will not appear when the system is having difficulty seeing other vehicles 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, 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 the scan tool Forward Collision Alert Function Status parameter is Off, Disabled, Not Ready To Assist or Ready To Assist.

• If the parameter is Malfunction

Refer to Circuit/System Testing - Frontview Camera Module Malfunction

• If the parameter is not Malfunction

3. Verify the driver information center displays and adjusts forward collision alert setting while repeatedly pressing and releasing the forward collision switch. The setting should cycle between far, medium, near, and off.

• If the display does not change

Refer to Circuit/System Testing - Forward Collision Alert Switch Malfunction.

• If the display changes

4. Verify the K109 Frontview Camera Module has good visibility to the road ahead.

• If visibility is poor

Clean windshield

• If visibility is good

1. All OK.

Circuit/System Testing

NOTE: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

Frontview Camera Module Malfunction

1. Ignition ON.
2. Verify no DTCs are set.

• If DTCs are set

Diagnose and repair DTCs. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

• If no DTCs are set

3. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.

   Disconnect the harness connector at the K109 Frontview Camera Module.

4. Test for less than 10 ohms between the ground circuit terminal 1 and ground.

• If 10 ohms or greater

1. Ignition OFF.
2. 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

5. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open

1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit 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 the test lamp illuminates

6. Ignition ON.
7. Test for less than 1 V between the signal circuit terminal 10 and ground.

• If 1 V or greater

1. Disconnect the harness connector at S70L Steering Wheel Controls Switch - Left.
2. Test for less than 1V between the signal circuit terminal 10 and ground.

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

8. Ignition OFF.
9. Test for infinite resistance between the signal circuit terminal 10 and ground with the forward collision alert switch not pressed

• If less than infinite resistance

1. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
2. Test for infinite resistance between the signal circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance test or replace the S70L Steering Wheel Controls Switch - Left.
• If infinite resistance

10. Test for 1.2k-1.4k ohms between the signal circuit terminal 10 and ground with the forward collision alert switch pressed.

• If not between 1.2k-1.4k ohms

1. Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left
2. Test for less than 2 ohms in the signal circuit from end to end.

• If greater than 2 ohms

Repair the open/high resistance in the circuit.

• If 2 ohms or less

3. Test or replace the S70L Steering Wheel Controls Switch - Left.

• If between 1.2k-1.4k ohms

11. Connect the harness connector of the S70L Steering Wheel Controls Switch - Left and K109 Frontview Camera Module.
12. Verify the scan tool Forward Collision Alert Function Status parameter is Off, Disabled, Not Ready To Assist or Ready To Assist.

• If parameter is Malfunction

Replace K109 Frontview Camera Module.

• If parameter is not Malfunction

13. All OK.

Forward Collision Alert Switch Malfunction

1. Ignition OFF and all vehicle systems OFF. It may take up to 2 min for all vehicle systems to power down.

Disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.

2. Test for less than 5 ohms between the ground circuit terminal 7 and ground.

• If 5 ohms or greater

1. Ignition OFF.
2. 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 5 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 signal circuit terminal 2 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 2 and the ground circuit terminal 7.
6. Verify DTC B356A 02 sets.

• 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 S70L Steering Wheel Controls Switch - Left.

Component Test

Switch Static Test

1. Ignition OFF, disconnect the harness connector at the S70L Steering Wheel Controls Switch - Left.
2. Test for infinite resistance between the control circuit terminal 2 and ground circuit terminal 7.

• If less than infinite resistance

Replace the S70L Steering Wheel Controls Switch - Left.

• If infinite resistance

3. Test for 1.0k - 1.5k ohms between the control circuit terminal 2 and ground circuit terminal 7 while pressing forward collision alert switch.

• If not between 1.0k - 1.5k ohms

Replace the S70L Steering Wheel Controls Switch - Left.

• If between 1.0k - 1.5k ohms

4. Test for 3.8k - 5.8k ohms between the control circuit terminal 2 and ground circuit terminal 7 while pressing lane departure warning switch.

• If not between 3.8k - 5.8k ohms

Replace the S70L Steering Wheel Controls Switch - Left.

• If between 3.8k - 5.8k ohms

5. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Cruise Control Switch Replacement
• Control Module References for frontview camera module replacement, programming and setup.

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