Diagnostic Instructions

DTC Descriptors

DTC B0954 01: Park Assist Sensor Front Left Outer Circuit Malfunction

DTC B0954 06: Park Assist Sensor Front Left Outer Circuit Open or Low Voltage

DTC B0954 08: Park Assist Sensor Front Left Outer Invalid Signal

DTC B0954 21: Park Assist Sensor Front Left Outer Circuit Incorrect Period

DTC B0955 01: Park Assist Sensor Front Left Middle Circuit Malfunction

DTC B0955 06: Park Assist Sensor Front Left Middle Circuit Open or Low Voltage

DTC B0955 08: Park Assist Sensor Front Left Middle Invalid Signal

DTC B0955 21: Park Assist Sensor Front Left Middle Circuit Incorrect Period

DTC B0956 01: Park Assist Sensor Front Right Middle Circuit Malfunction

DTC B0956 06: Park Assist Sensor Front Right Middle Circuit Open or Low Voltage

DTC B0956 08: Park Assist Sensor Front Right Middle Invalid Signal

DTC B0956 21: Park Assist Sensor Front Right Middle Circuit Incorrect Period

DTC B0957 01: Park Assist Sensor Front Right Outer Circuit Malfunction

DTC B0957 06: Park Assist Sensor Front Right Outer Circuit Open or Low Voltage

DTC B0957 08: Park Assist Sensor Front Right Outer Invalid Signal

DTC B0957 21: Park Assist Sensor Front Right Outer Circuit Incorrect Period

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
8-Volt Reference	B0954 06, B0955 06, B0956 06, B0957 06, B138A 03	B0954 06, B0955 06, B0956 06, B0957 06, B138A 03	B138A 07	--
Left Front Corner Object Sensor Signal	B0954 06	B0954 06	B0954 01	B0954 08, B0954 21
Left Front Middle Object Sensor Signal	B0955 06	B0955 06	B0955 01	B0955 08, B0955 21
Right Front Middle Object Sensor Signal	B0956 06	B0956 06	B0956 01	B0956 08, B0956 21
Right Front Corner Object Sensor Signal	B0957 06	B0957 06	B0957 01	B0957 08, B0957 21
Low Reference	--	B0954 06, B0955 06, B0956 06, B0957 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 object alarm module supplies an 8 V reference and ground reference to each of the object sensors. The object alarm module triggers the sensors in a sequential loop. After each sensor transmits, the object alarm module uses the sensor ring received through the signal circuit to calculate the distance and position of an object.

Conditions for Running the DTC

Conditions for Setting the DTC

B0954 01, B0955 01, B0956 01 or B0957 01

The front object sensor signal circuit detects a voltage greater than 11.5 V.

B0954 06, B0955 06, B0956 06 or B0957 06

The front object sensor signal circuit detects a voltage less than 0.5 V.

B0954 08, B0955 08, B0956 08 or B0957 08

The object alarm module detects an invalid signal.

B0954 21, B0955 21, B0956 21 or B0957 21

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

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Object Detection Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Object Detection Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Verify that DTC B138A is not set.

⇒	If DTC is set, refer to DTC B138A.

2. Park brake OFF, transmission in DRIVE, individually place a suitable object in front of each object sensor. Verify the appropriate scan tool Front Region parameter is between Zone 1 and Zone 4.

Circuit/System Testing

Single Object Sensor DTC Set

1. Ignition OFF, disconnect the harness connector at the appropriate front object sensor.
2. Ignition OFF for 30 seconds, test for less than 5 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 object alarm module.

3. Ignition ON, transmission in DRIVE, test for 7.2 - 9.2 V between the voltage reference terminal 1 and ground.

⇒	If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.

⇒	If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.

4. Ignition OFF, remove the malfunctioning object sensor and swap locations with another properly functioning object sensor. Connect the harness connector at both sensors.
5. Ignition ON, 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 object alarm module.

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

Multiple Object Sensor DTCs Set

1. Ignition OFF, disconnect the harness connector at each of the object sensors.
2. Ignition OFF for 30 seconds, test for less than 5 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 object alarm module.

3. Ignition ON, transmission in DRIVE, test for 8.0 - 9.0 V between the voltage reference circuit terminal 1 and ground.

⇒	If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.

⇒	If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.