B0957
DTC B0954, B0955, B0956, or B0957
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using the diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC B0954 01
- Parking Aid Front Sensor 1 (Left Corner) Circuit-Short to Battery
DTC B0954 06
- Parking Aid Front Sensor 1 (Left Corner) Circuit-Short to Ground or Open
DTC B0954 08
- Parking Aid Front Sensor 1 (Left Corner) Circuit-Signal Invalid
DTC B0954 21
- Parking Aid Front Sensor 1 (Left Corner) Circuit-Incorrect Period
DTC B0955 01
- Parking Aid Front Sensor 2 (Left Middle) Circuit-Short to Battery
DTC B0955 06
- Parking Aid Front Sensor 2 (Left Middle) Circuit-Short to Ground or Open
DTC B0955 08
- Parking Aid Front Sensor 2 (Left Middle) Circuit-Signal Invalid
DTC B0955 21
- Parking Aid Front Sensor 2 (Left Middle) Circuit-Incorrect Period
DTC B0956 01
- Parking Aid Front Sensor 3 (Right Middle) Circuit-Short to Battery
DTC B0956 06
- Parking Aid Front Sensor 3 (Right Middle) Circuit-Short to Ground or Open
DTC B0956 08
- Parking Aid Front Sensor 3 (Right Middle) Circuit-Signal Invalid
DTC B0956 21
- Parking Aid Front Sensor 3 (Right Middle) Circuit-Incorrect Period
DTC B0957 01
- Parking Aid Front Sensor 4 (Right Corner) Circuit-Short to Battery
DTC B0957 06
- Parking Aid Front Sensor 4 (Right Corner) Circuit-Short to Ground or Open
DTC B0957 08
- Parking Aid Front Sensor 4 (Right Corner) Circuit-Signal Invalid
DTC B0957 21
- Parking Aid Front Sensor 4 (Right Corner) Circuit-Incorrect Period
Diagnostic Fault Information
Circuit/System Description
Each object sensor is a 3-wire sensor that is both a transmitter and a receiver that includes a signal circuit, a low reference circuit, and an 8-volt supply voltage circuit. The object alarm module supplies 8 volts to the object sensors via the object sensor supply voltage circuit and provides ground via the low reference circuit. The object alarm module triggers the sensors in a sequential loop. After each sensor transmits, the object alarm module uses the echo or signal return to calculate the distance and position of an object from the front or rear bumper.
Conditions for Running the DTC
* Ignition voltage is between 9-16 volts.
* The vehicle is in DRIVE.
Conditions for Setting the DTC
B0954 01, B0955 01, B0956 01, or B0957 01
The object detection alarm module signal circuit is short to battery.
B0954 06, B0955 06, B0956 06, or B0957 06
The object detection alarm module signal circuit is short to ground or open.
B0954 08, B0955 08, B0956 08, or B0957 08
The object detection alarm module signal circuit is invalid.
B0954 21, B0955 21, B0956 21, or B0957 21
The object detection alarm module has an incorrect period.
Action Taken When the DTC Sets
* The object alarm module commands the telltale red indicator ON.
* The object alarm module sends a serial data communication message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC), and the chime will sound.
Conditions for Clearing the DTC
* This DTC will change from current to history when the fault is no longer present.
* A history DTC will clear after 100 consecutive ignition cycles, if the condition for the malfunction 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 (Connector Views)
Description and Operation
Object Detection Description and Operation (Rear Park Assist) (Object Detection Description and Operation (Rear Park Assist))Object Detection Description and Operation (VDAAW) (Object Detection Description and Operation (VDAAW))Object Detection Description and Operation (SOD) (Object Detection Description and Operation (SOD))
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Programming and Relearning (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Verify that DTC B1E3A is not current.
• If B1E3A is current, refer to DTC B1E3A (B1E3A) .
2. Park brake disabled, transmission in DRIVE, suitable object behind an appropriate sensor, verify that the appropriate Front Region scan tool parameter displays a value between Zone 1 and Zone 8.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the appropriate front object sensor.
2. Ignition OFF for 30 seconds, test for less than 5.0 ohms 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 object alarm module.
3. Ignition ON, transmission in DRIVE, test for 8.0-9.0 volts between the rear object sensor supply voltage circuit terminal 1 and ground.
• If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
• If less than the specified range, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.
4. Ignition OFF, connect the appropriate rear object sensor and disconnect X3 harness connector at the object alarm module.
5. Ignition ON, test for less than 1.0V between signal circuit and ground of the appropriate rear object sensor listed below:
* LF middle object sensor signal circuit terminal 5
* LF corner object sensor signal circuit terminal 3
* RF middle object sensor signal circuit terminal 10
* RF corner object sensor signal circuit terminal 11
• If greater than the specified range, test the signal circuit for a short to voltage.
6. Ignition OFF, test for infinite resistance between signal circuit and ground of the appropriate rear object sensor listed below:
* LF middle object sensor signal circuit terminal 5
* LF corner object sensor signal circuit terminal 3
* RF middle object sensor signal circuit terminal 10
* RF corner object sensor signal circuit terminal 11
• If less than the specified value, test the signal circuit for a short to ground.
7. Test for less than 2 ohms between the sensor signal circuit terminal 3 and signal circuit of the appropriate rear object sensor listed below:
* LF middle object sensor signal circuit terminal 5
* LF corner object sensor signal circuit terminal 3
* RF middle object sensor signal circuit terminal 10
* RF corner object sensor signal circuit terminal 11
• If greater than the specified range, test the signal circuit for an open/high resistance.
Important: Because the object alarm module does not update rear object sensor data when a DTC is set, the diagnostic can not determine whether the module or the sensor is causing the DTC to set.
8. If all circuits test normal, test or replace the appropriate rear object alarm sensor and verify that the DTC does not reset.
• If the DTC resets, replace object alarm module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Object Alarm Sensor Replacement (Front Object Alarm Sensor Replacement)
* Programming and Relearning (Programming and Relearning) for object alarm module replacement, setup, and programming