Service Information

Volt

DTC B0958, B0959, B0960, or B0961

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 B0958 01: Parking Assist Rear Sensor Left Corner Circuit Short to Battery

DTC B0958 06: Parking Assist Rear Sensor Left Corner Circuit Low Voltage/Open

DTC B0958 08: Parking Assist Rear Sensor Left Corner Circuit Performance - Signal Invalid

DTC B0958 21: Parking Assist Rear Sensor Left Corner Circuit Incorrect Period

DTC B0958 3A: Parking Assist Rear Sensor Left Corner Circuit Incorrect Component Installed

DTC B0959 01: Parking Assist Rear Sensor Left Middle Circuit Short to Battery

DTC B0959 06: Parking Assist Rear Sensor Left Middle Circuit Low Voltage/Open

DTC B0959 08: Parking Assist Rear Sensor Left Middle Circuit Performance - Signal Invalid

DTC B0959 21: Parking Assist Rear Sensor Left Middle Circuit Incorrect Period

DTC B0959 3A: Parking Assist Rear Sensor Left Middle Circuit Incorrect Component Installed

DTC B0960 01: Parking Assist Rear Sensor Right Middle Circuit Short to Battery

DTC B0960 06: Parking Assist Rear Sensor Right Middle Circuit Low Voltage/Open

DTC B0960 08: Parking Assist Rear Sensor Right Middle Circuit Performance - Signal Invalid

DTC B0960 21: Parking Assist Rear Sensor Right Middle Circuit Incorrect Period

DTC B0960 3A: Parking Assist Rear Sensor Right Middle Circuit Incorrect Component Installed

DTC B0961 01: Parking Assist Rear Sensor Right Corner Circuit Short to Battery

DTC B0961 06: Parking Assist Rear Sensor Right Corner Circuit Low Voltage/Open

DTC B0961 08: Parking Assist Rear Sensor Right Corner Circuit Performance - Signal Invalid

DTC B0961 21: Parking Assist Rear Sensor Right Corner Circuit Incorrect Period

DTC B0961 3A: Parking Assist Rear Sensor Right Corner Circuit Incorrect Component Installed

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
8V Reference	B1405 02	B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06, B1405 03	B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06, B1405 07	--
Left Rear Object Sensor Signal	B0958 06	B0958 06	B0958 01	B0958 08, B0958 21
Left Middle Rear Object Sensor Signal	B0959 06	B0959 06	B0959 01	B0959 08, B0959 21
Right Middle Rear Object Sensor Signal	B0960 06	B0960 06	B0960 01	B0960 08, B0960 21
Right Rear Object Sensor Signal	B0961 06	B0961 06	B0961 01	B0961 08, B0961 21
Low Reference	--	B0954 06, B0955 06, B0956 06, B0957 06, B0958 06, B0959 06, B0960 06, B0961 06	--	--

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 parking assist control module supplies 8 V to the object sensors via the 8 V reference circuit and provides ground via the low reference circuit. The parking assist control module triggers the sensors in a sequential loop. After each sensor transmits, the parking assist control module uses the sensor echo received through the signal circuit to calculate the distance and position of an object.

Conditions for Running the DTC

•	Vehicle in Service Mode or ON.

•	The parking assist is activated. The activation takes place through putting in the reverse gear or through operating the park assist switch.

Conditions for Setting the DTC

B0958 01, B0959 01, B0960 01, or B0961 01

The parking assist control module has detected the voltage at the sensor circuit is greater than 11.5 V or the object sensor is not grounded.

B0958 06, B0959 06, B0960 06, or B0961 06

The parking assist control module has detected the voltage at the sensor circuit less than 0.5 V.

B0958 08, B0959 08, B0960 08, or B0961 08

The parking assist control module has received an invalid signal.

B0958 21, B0959 21, B0960 21, or B0961 21

The object sensor determines no change in the position of an object while the vehicle is in motion.

B0958 3A, B0959 3A, B0960 3A, or B0961 3A

The parking assist control module determines the wrong sensor type is installed.

Action Taken When the DTC Sets

•	The parking assist is disabled.

•	The driver information centre 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

Connector End View Reference

Component Connector End Views

Description and Operation

Object Detection Description and Operation : UVC → UD5

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

Verify that DTC B1405 is not present.

⇒	If DTC is present, refer to DTC B1405 .

Verify that DTC B0958 01, B0959 01, B0960 01 or B0961 01 is not present.

⇒	If DTC is present, check the appropriate sensor for contamination with mud, ice or snow. If no contamination is diagnosed, refer to Circuit/System Testing.

Verify that DTC B0958 21, B0959 21, B0960 21 or B0961 21 is not present.

⇒	If DTC is present, check the appropriate sensor for contamination with mud, ice or snow. If no contamination is diagnosed, replace the sensor.

Verify that DTC B0958 3A, B0959 3A, B0960 3A or B0961 3A is not present.

⇒	If DTC is present, replace the appropriate sensor with a sensor of correct sensor type.

Vehicle in Service Mode, transmission in REVERSE, verify the scan tool Parking Assist System Status parameter displays Enabled.

Circuit/System Testing

Vehicle OFF for 30 s, disconnect the harness connector at the appropriate rear object sensor.
Test for less than 30 Ω between the low reference circuit terminal 2 and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K41 Front and Rear Parking Assist Control Module.

Vehicle in Service Mode, transmission in REVERSE, test for 7.5-9.0 V between the 8 V reference circuit terminal 1 and ground.

⇒	If less than the specified range, test the 8 V reference circuit for an open/high resistance. If the circuit tests normal, replace the K41 Front and Rear Parking Assist Control Module.

Vehicle OFF, remove the malfunctioning object sensor and swap locations with another properly functioning rear object sensor. Connect the harness connector at both sensors.
Vehicle in Service Mode, verify the DTC is set for the new location in which the malfunctioning sensor is installed.

⇒	If the DTC does not set for the new location, test the signal circuit terminal 3 for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the K41 Front and Rear Parking Assist Control Module.

If the DTC sets for the new location in which the malfunctioning sensor is installed, replace the appropriate rear object sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Rear Parking Assist Alarm Sensor Replacement

•	Control Module References for parking assist control module replacement, programming and set-up