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Home >> Buick >> 2013 >> Regal L4-2.0L Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> B Code Charts >> B0957

B0957





DTC B0954, B0955, B0956, or B0957

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 B0954 01
- Parking Assist Front Sensor Right Corner Circuit Short to Battery

DTC B0954 06
- Parking Assist Front Sensor Right Corner Circuit Low Voltage/Open

DTC B0954 08
- Parking Assist Front Sensor Right Corner Circuit Performance - Signal Invalid

DTC B0954 21
- Parking Assist Front Sensor Right Corner Circuit Incorrect Period

DTC B0954 3A
- Parking Assist Front Sensor Right Corner Circuit Incorrect Component Installed

DTC B0955 01
- Parking Assist Front Sensor Right Middle Circuit Short to Battery

DTC B0955 06
- Parking Assist Front Sensor Right Middle Circuit Low Voltage/Open

DTC B0955 08
- Parking Assist Front Sensor Right Middle Circuit Performance - Signal Invalid

DTC B0955 21
- Parking Assist Front Sensor Right Middle Circuit Incorrect Period

DTC B0955 3A
- Parking Assist Front Sensor Right Middle Circuit Incorrect Component Installed

DTC B0956 01
- Parking Assist Front Sensor Left Middle Circuit Short to Battery

DTC B0956 06
- Parking Assist Front Sensor Left Middle Circuit Low Voltage/Open

DTC B0956 08
- Parking Assist Front Sensor Left Middle Circuit Performance - Signal Invalid

DTC B0956 21
- Parking Assist Front Sensor Left Middle Circuit Incorrect Period

DTC B0956 3A
- Parking Assist Front Sensor Left Middle Circuit Incorrect Component Installed

DTC B0957 01
- Parking Assist Front Sensor Left Corner Circuit Short to Battery

DTC B0957 06
- Parking Assist Front Sensor Left Corner Circuit Low Voltage/Open

DTC B0957 08
- Parking Assist Front Sensor Left Corner Circuit Performance - Signal Invalid

DTC B0957 21
- Parking Assist Front Sensor Left Corner Circuit Incorrect Period

DTC B0957 3A
- Parking Assist Front Sensor Left Corner Circuit Incorrect Component Installed

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 8 V reference circuit and provides ground via the 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 signal circuit to calculate the distance and position of an object.

Conditions for Running the DTC

* Ignition ON

* The park 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

B0954 01, B0955 01, B0956 01, or B0957 01

The front and rear 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.

B0954 06, B0955 06, B0956 06, or B0957 06

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

B0954 08, B0955 08, B0956 08, or B0957 08

The front and rear parking assist control module has received an invalid signal.

B0954 21, B0955 21, B0956 21, or B0957 21

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

B0954 3A, B0955 3A, B0956 3A, or B0957 3A

The front and rear 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 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 [1][2]Collision Avoidance and Parking Assist Systems

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Object Detection Description and Operation Description and Operation

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 that DTC B1405 is not set.

• If the DTC is set
Refer to DTC B1405 (with Rear Park Assist) Object Detection (with Rear Park Assist)DTC B1405 (with Front and Rear Park Assist) Object Detection (with Front and Rear Park Assist)

• If the DTC is not set

3. Verify that DTC B0954 01, B0955 01, B0956 01, B0957 01 B0954 21, B0955 21, B0956 21 or B0957 21 is not set.

• If the DTC is set

1. Verify the B78 Front Object Sensors are not contaminated with snow, mud, dirt, slush, or ice.

• If contaminated, clean sensor.

• If there is no contamination

2. Refer to Circuit/System Testing.

• If the DTC is not set

4. Verify that DTC B0954 3A, B0955 3A, B0956 3A or B0957 3A is not set.

• If the DTC is set
Replace the B78 Front Object Sensor with the correct sensor type.

• If the DTC is not set

5. Ignition ON, transmission in REVERSE.

6. Verify the scan tool Parking Assist System Status parameter displays Enabled.

• If the Parking Assist System displays Disabled
Refer to Circuit/System Testing.

• If the Parking Assist System displays Enabled

7. All OK.

Circuit/System Testing

1. Ignition OFF, scan tool disconnected, disconnect the harness at the appropriate B78 Front Object Sensor. It may take up to 2 min for all vehicle systems to power down.

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

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector X3 at the K41 Front and Rear Parking Assist Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

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

• If less than 2 ohms replace the K41 Front and Rear Parking Assist Control Module.

• If less than 10 ohms

3. Ignition ON.

4. Test for 7.5-9.5 V between the 8 V reference circuit terminal 1 and ground.

• If less than 7.5 V

1. Ignition OFF, disconnect the harness connector at the K41 Front and Rear Parking Assist Control Module.

2. Test for infinite resistance between the 8 V reference 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 8 V reference circuit end to end.

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

• If less than 2 ohms, replace the K41 Front and Rear Parking Assist Control Module.

• If greater than 9.5 V

1. Ignition OFF, disconnect the harness connector 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 and ground.

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

• If less than 1 V, replace the K41 Front and Rear Parking Assist Control Module.

• If between 7.5-9.5 V

5. Ignition OFF, remove appropriate B78 Front Object Sensor and switch locations with another properly operating sensor. Connect harness connector at both sensors. Ignition ON.

6. Verify the DTC is set for the new location in which the malfunctioning sensor is installed.

• If DTC set for the new location
Replace the malfunctioning B78 Front Object Sensor.

• If DTC set for the original location

1. Ignition OFF, disconnect the harness connector at the K41 Front and Rear Parking Assist Control 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. Ignition OFF.

4. 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

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

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

• If less than 2 ohms, replace the K41 Front and Rear Parking Assist Control Module.

• If no DTC set

7. All OK.

Repair Instructions

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

* Front Parking Assist Alarm Sensor Replacement Front Parking Assist Alarm Sensor Replacement

* Rear Parking Assist Alarm Sensor Replacement Rear Parking Assist Alarm Sensor Replacement

* Control Module References Control Module References for front and rear parking assist control module replacement, programming and setup

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