B0958
DTC B0958, B0959, B0960, or B0961
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B0958 01
- Parking Aid Rear Sensor 1 Left Corner Circuit Short to Battery
DTC B0958 06
- Parking Aid Rear Sensor 1 Left Corner Circuit Short to Ground or Open
DTC B0958 08
- Parking Aid Rear Sensor 1 Left Corner Circuit Signal Invalid
DTC B0958 21
- Parking Aid Rear Sensor 1 Left Corner Circuit Incorrect Period
DTC B0959 01
- Parking Aid Rear Sensor 1 Left Middle Circuit Short to Battery
DTC B0959 06
- Parking Aid Rear Sensor 1 Left Middle Circuit Short to Ground or Open
DTC B0959 08
- Parking Aid Rear Sensor 1 Left Middle Circuit Signal Invalid
DTC B0959 21
- Parking Aid Rear Sensor 1 Left Middle Circuit Incorrect Period
DTC B0960 01
- Parking Aid Rear Sensor 1 Right Middle Circuit Short to Battery
DTC B0960 06
- Parking Aid Rear Sensor 1 Right Middle Circuit Short to Ground or Open
DTC B0960 08
- Parking Aid Rear Sensor 1 Right Middle Circuit Signal Invalid
DTC B0960 21
- Parking Aid Rear Sensor 1 Right Middle Circuit Incorrect Period
DTC B0961 01
- Parking Aid Rear Sensor 1 Right Corner Circuit Short to Battery
DTC B0961 06
- Parking Aid Rear Sensor 1 Right Corner Circuit Short to Ground or Open
DTC B0961 08
- Parking Aid Rear Sensor 1 Right Corner Circuit Signal Invalid
DTC B0961 21
- Parking Aid Rear Sensor 1 Right Corner Circuit Incorrect Period
Circuit/System Description
The object alarm detection system senses how close the vehicle is to an object. The distance is determined by the 4 ultrasonic sensors located in the rear bumper. The object detection system will notify the driver when backing up at speeds less than 8 km/h (5 mph), which make parking easier and helps you avoid colliding with objects such as parked vehicles. Each object sensor is a 3-wire sensor that is both a transmitter and a receiver that comprises a signal circuit, a low reference circuit, and an 8-volt supply voltage circuit. The rear object control module supplies 8 volts to the object sensors via the object sensor supply voltage circuit and provides ground via the low reference circuit. The rear object control module triggers the sensors in a sequential loop and after each sensor transmits, the rear object control module uses the echo or signal return to calculate the distance and position of an object from the rear bumper. The rear object control module directly controls the rear parking assist (RPA) display. The RPA consists of 2 amber and one red LED that indicate the range of an object from the rear bumper. The rear object control module will also use an audible warning by sending a low speed GMLAN message to the radio.
Conditions for Running the DTC
Ignition voltage is between 9-16 volts.
Conditions for Setting the DTC
B0958 01, B0959 01, B0960 01, or B0961 01
The object sensor signal circuit output is greater than 11.5 volts.
B0958 06, B0959 06, B0960 06, or B0961 06
The object sensor signal circuit output is less than 0.5 volts.
B0958 08, B0959 08, B0960 08, or B0961 08
The object sensor signal circuit is invalid.
B0958 21, B0959 21, B0960 21, or B0961 21
The object sensor senses no change in an objects position when the vehicle is moving.
Action Taken When the DTC Sets
* The object alarm module commands ON the information center telltale red indicator.
* 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.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of the suspect rear object alarm sensor.
2. Test for less than 1.0 ohm of resistance between the low reference circuit and ground.
• If greater than 1.0 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the rear object alarm module.
3. Ignition ON with the transmission in reverse, test for 8.2-8.8 volts between the rear object alarm sensor supply voltage circuit and the low reference circuit.
• If greater than 8.8V, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
• If less than 8.2V, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear object alarm module.
4. Ignition ON with the transmission in reverse, test for 7.2-9.2 volts between the rear object alarm sensor signal circuit and the low reference circuit.
• If greater than 9.2V, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear object alarm module.
• If less than 7.2V, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear object alarm module.
5. If all circuits test normal, replace the suspect rear object alarm sensor.
Repair Instructions
* Rear Object Sensor Replacement for rear object sensor replacement
* Programming and RelearningProgramming and Relearning