Diagnostic Instructions

DTC Descriptors

DTC B0958 01: Park Assist Sensor Rear Left Outer Circuit Malfunction

DTC B0958 06: Park Assist Sensor Rear Left Outer Circuit Open or Low Voltage

DTC B0958 08: Park Assist Sensor Rear Left Outer Invalid Signal

DTC B0958 21: Park Assist Sensor Rear Left Outer Circuit Incorrect Period

DTC B0959 01: Park Assist Sensor Rear Left Middle Circuit Malfunction

DTC B0959 06: Park Assist Sensor Rear Left Middle Circuit Open or Low Voltage

DTC B0959 08: Park Assist Sensor Rear Left Outer Invalid Signal

DTC B0959 21: Park Assist Sensor Rear Left Outer Circuit Incorrect Period

DTC B0960 01: Park Assist Sensor Rear Right Middle Circuit Malfunction

DTC B0960 06: Park Assist Sensor Rear Right Middle Circuit Open or Low Voltage

DTC B0960 08: Park Assist Sensor Rear Right Middle Invalid Signal

DTC B0960 21: Park Assist Sensor Rear Right Middle Circuit Incorrect Period

DTC B0961 01: Park Assist Sensor Rear Right Outer Circuit Malfunction

DTC B0961 06: Park Assist Sensor Rear Right Outer Circuit Open or Low Voltage

DTC B0961 08: Park Assist Sensor Rear Right Middle Invalid Signal

DTC B0961 21: Park Assist Sensor Rear Right Middle Circuit Incorrect Period

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
8-Volt Reference	B0958 06, B0959 06, B0960 06, B0961 06, B138A 03	B0958 06, B0959 06, B0960 06, B0961 06, B138A 03	B138A 07	--
Left Rear Corner Object Sensor Signal	B0958 06	B0958 06	B0958 01	B0958 08, B0958 21
Left Rear Middle Object Sensor Signal	B0959 06	B0959 06	B0959 01	B0959 08, B0959 21
Right Rear Middle Object Sensor Signal	B0960 06	B0960 06	B0960 01	B0960 08, B0960 21
Right Rear Corner Object Sensor Signal	B0961 06	B0961 06	B0961 01	B0961 08, B0961 21
Low Reference	--	B0958 06, B0959 06, B0960 06, B0961 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

B0958 01, B0959 01, B0960 01 or B0961 01

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

B0958 06, B0959 06, B0960 06 or B0961 06

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

B0958 08, B0959 08, B0960 08 or B0961 08

The object alarm module detects an invalid signal.

B0958 21, B0959 21, B0960 21 or B0961 21

The rear 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 REVERSE, individually place a suitable object behind each sensor. Verify the appropriate scan tool Rear 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 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 REVERSE, test for 7.2 - 9.2 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.

4. Ignition OFF, remove the malfunctioning object sensor and swap locations with another properly functioning rear 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 rear 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 REVERSE, 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.