Diagnostic Instructions

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

Circuit	Short to Ground	Open or High Resistance	Short to Voltage	Signal Performance
Left Front Sensor 1 Signal	B0954 06	B0954 06	B0954 01	B0954 08, B0954 21
Left Front Sensor 1 Low Reference	--	B0954 06	B0954 01	B0954 08, B0954 21
Left Middle Front Sensor 2 Signal	B0955 06	B0955 06	B0955 01	B0955 08, B0955 21
Left Middle Front Sensor 2 Low Reference	--	B0955 06	B0955 01	B0955 08, B0955 21
Right Middle Front Sensor 3 Signal	B0956 06	B0956 06	B0956 01	B0956 08, B0956 21
Right Middle Front Sensor 3 Low Reference	--	B0956 06	B0956 01	B0956 08 B0956 21
Right Front Sensor 4 Signal	B0957 06	B0957 06	B0957 01	B0957 08, B0957 21
Right Front Sensor 4 Low Reference	--	B0957 06	B0957 01	B0957 08, B0957 21

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. 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

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Object Detection Schematics

Connector End View Reference

Object Detection Connector End Views

Electrical Information Reference

Circuit/System Verification

1. Verify that DTC B1E3A is not current.

⇒	If B1E3A is current, refer to DTC 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 after completing the diagnostic procedure.