B0956

DTC B0954, B0955, B0956, or B0957

DTC Descriptors

DTC B0954 01
- Parking Aid Front Sensor 1 (Left) Circuit-Short to Battery

DTC B0954 06
- Parking Aid Front Sensor 1 Circuit (Left)-Signal Circuit Short to Ground or Open

DTC B0954 08
- Parking Aid Front Sensor 1 (Left) Circuit-Signal Invalid

DTC B0954 21
- Parking Aid Front Sensor 1 (Left) 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

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

The object alarm system monitors the distance and how close a vehicle is to an object when moving forward or backing up in a parking maneuver. The object alarm system will notify the driver of any objects of interest when backing up or moving forward at speeds less than 8 km/h (5 mph). The distance between a vehicle and an object of interest is monitored by the 4 ultrasonic sensors located in the front or rear bumpers of the vehicle (if equipped). The object alarm sensors receive the echo signal reflected off an object of interest while the vehicle is backing up or moving forward at speeds less than 8 km/h (5 mph). The object alarm system uses visual displays and audible warnings from the radio speakers to warn the driver of an object of interest within the defined field of view. The visual display comprises of two amber and one red indicators and these indicators illuminate based on the vehicle distance to the object of interest. The object alarm sensor is a three wire sensor comprising of the supply voltage circuit, signal circuit and the low reference circuit. Power and ground is provided to the object alarm sensor via the supply voltage circuit and low reference from the object detection alarm module. The typical object detection alarm sensor signal voltage when the system is active is between 7.2-9.2 V.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

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 system is disabled.
* The object alarm module commands ON the information center telltale red indicator.
* The object alarm module will send a GMLAN serial data 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

* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The object alarm module receives a clear code command from the scan tool.

Circuit/System Testing

Important: When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector.

* The front object detection alarm sensors

* The front and rear object detection alarm module

* The front object detection alarm sensor wiring harness connector

* The front and rear object detection alarm module wiring harness connector

1. Ignition OFF, disconnect the harness connector of the suspect front object alarm sensor.
2. Test for less than 1 ohm of resistance between the low reference circuit and ground.

• If greater than 1 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the front object alarm module.

3. Ignition ON with the transmission in drive or 1st gear, test for 8.2 V - 8.8 V between the front object alarm sensor supply voltage circuit and the low reference circuit.

• If greater than 8.8 V, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the front object alarm module.

• If less than 8.2 V, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the front object alarm module.

4. Ignition ON with the transmission in drive or 1st gear, test for 7.2-9.2 V between the object alarm sensor signal circuit and the low reference circuit.

• If greater than 9.2 V, test the signal circuit for a short to voltage. If the circuit tests normal, replace the front object alarm module.

• If less than 7.2 V, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the front object alarm module.

5. If all circuits test normal, replace the suspect front object alarm sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Front Object Alarm Sensor Replacement
* Programming and Relearning for object alarm module setup, and programming. Programming and Relearning