Diagnostic Instructions
DTC Descriptor
DTC B0968 00: Parking Aid Indicator Circuit
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
The following condition must exist for 300 milliseconds:
The object alarm module has detected that one of the three indicator control circuits for the rear display is determined to be open or shorted.
Action Taken When the DTC Sets
• | The object alarm module sets a DTC. |
• | The object alarm module commands ON the information center telltale red indicator and disable the object detection system. |
• | The object alarm module will send a serial data communication message to the instrument panel (I/P) to scroll SERVICE PARK ASSIST message on the driver information center (DIC), and the chime will sound. |
Reference Information
Schematic Reference
Object Detection Schematics
Connector End View Reference
Object Detection Connector End Views
Electrical Information Reference
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 information center telltale assembly indicator |
• | The object alarm module |
• | The information center telltale assembly indicator wiring harness connector |
• | The object alarm module wiring harness connector |
- Ignition ON, use the scan tool and perform the LED Test in Special Functions. The scan tool will command each indicator to turn ON then proceed to the next one. Verify that the information center telltale indicators turn ON.
- Remove the object alarm module connector.
- The information center telltale does turn ON then remove the rear information center telltale assembly.
- Test all the indicator circuits between information center telltale assembly indicator connector and the object alarm module for a short to voltage or an open. Verify that a short to voltage or an open does not exist.
⇒ | If any of the above conditions are found make the appropriate repair. |
- Reconnect the object alarm module connector.
- Ignition ON, connect a test lamp between the telltale assembly supply voltage circuit and each indicator control circuit on the information center telltale indicator connector one at a time. With the scan tool perform the LED Test. Verify that each
indicator illuminate the test lamp.
⇒ | If the test lamp does not illuminate replace the object alarm module. |
- Each indicator illuminate the test lamp then replace the information center telltale assembly replacement (rear). After replacement refer to Repair Verification.
Repair Instructions
Repair Verification
Reconnect all components. Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify DTC B0968 does not set.
⇒ | If DTC B0968 was current replace the object alarm module. |