Chevrolet Trax: DTC B1405 (Front and rear park assist - ud5): control module voltage reference output 2

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 B1405 02

Control Module Voltage Reference Output 2 Circuit Short to Ground

DTC B1405 03

Control Module Voltage Reference Output 2 Circuit Low Voltage

DTC B1405 07

Control Module Voltage Reference Output 2 Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The object sensors are 3-wire sensors that are used to determine the distance between the vehicle and an object of interest. The front and rear parking assist control module supplies 8 V to the object sensors via the object sensor supply voltage circuit and provides ground via the object sensor low reference circuit. The front and rear parking assist control module triggers the sensors in a sequential loop. After each sensor transmits, the front and rear parking assist control module uses the sensor echo received through the object sensor signal circuit to calculate the distance and position of an object.

Conditions for Running the DTC

• Ignition ON, engine RUNNING
• Transmission in REVERSE

Conditions for Setting the DTC

B1405 02

The front and rear parking assist control module has detected the object sensor supply voltage circuit is shorted to ground.

B1405 03

The front and rear parking assist control module has detected the object sensor supply voltage circuit is less than 7.2 V.

B1405 07

The front and rear parking assist control module has detected the object sensor supply voltage circuit is greater than 9.2 V.

Action Taken When the DTC Sets

• The parking assist is disabled.
• The driver information center displays SERVICE PARK ASSIST.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

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

Ignition ON, engine running, transmission in R.

Verify the scan tool Park Assist Sensor Reference Voltage parameter is between 7.2-9.2 V.

• If Park Assist Sensor Reference Voltage is not between 7.2-9.2 V

Refer to Circuit/System Testing

• If Park Assist Sensor Reference Voltage is between 7.2-9.2V

3. All OK.

Circuit/System Testing

1. Ignition OFF, disconnect harness connectors X2 and X3 at the K41 Front and Rear Parking Assist Control Module, ignition ON.
2. Test for less than 1 V between the 8 V reference circuit terminals listed below and ground.

• Terminal 4 X2
• Terminal 1 X3
• If 1 V or greater

Repair the short to voltage on the circuit.

• If less than 1 V

3. Ignition OFF.
4. Test for infinite resistance between 8V reference circuit terminals listed below and ground.

• Terminal 4 X2
• Terminal 1 X3
• If less than infinite resistance

Repair the short to ground on the circuit.

• If infinite resistance

5. Replace the K41 Front and Rear Parking Assist Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Front Object Alarm Sensor Housing Replacement
• Rear Parking Assist Alarm Sensor Replacement
• Control Module References for front and rear parking assist control module replacement, programming and setup.

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