B138A

DTC B138A

DTC DESCRIPTOR

DTC B138A 03
Sensor Power Circuit Voltage Below Threshold

DTC B138A 07
Sensor Power Circuit Voltage Above Threshold

DIAGNOSTIC FAULT INFORMATION

IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Testing and Inspection

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 and front (if equipped) bumpers. The object detection system will notify the driver when backing up or moving forward while parking at speeds less than 8 km/h (5 mph), which make parking easier and helps you avoid colliding with objects such as parked vehicles. The object detection system will use front and rear display indicators and the radio speakers for notification.

CONDITIONS FOR RUNNING THE DTC
Ignition voltage is between 9-16 volts.

CONDITIONS FOR SETTING THE DTC

B138A 03
The object alarm module has detected the object alarm sensor supplied voltage circuit is below 7.2 volts.

B138A 07
The object alarm module has detected the object alarm sensor supplied voltage circuit is above 9.2 volts.

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.
- The object alarm module will send a serial data communication message to the I/P to scroll SERVICE PARK ASSIST message on the DIC, and the chime will sound

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 front object alarm sensors
- The rear object sensors
- The front and rear object alarm module
- The front object alarm sensors wiring harness connector
- The rear object sensors wiring harness connector
- The front and rear object alarm module wiring harness connector

1. Use a scan tool, check for DTC B1325. Verify that DTC B1325 is not current.
- If DTC B1325 is current refer to DTC B1325.
2. Check for DTC B0954, B0955, B0956, or B0957. Verify that DTC B0954, B0955, B0956, or B0957 is not current.
- If DTC B0954, B0955, B0956, or B0957 is current refer to DTC B0954, B0955, B0956, or B0957. B0954 B0955 B0956 B0957
3. Check for DTC B0958, B0959, B0960, or B0961. Verify that DTC B0958, B0959, B0960, or B0961 is not current.
- If DTC B0958, B0959, B0960, or B0961 is current refer to DTC B0958, B0959, B0960, or B0961. B0958 B0959 B0960 B0961
4. Remove the front and rear object alarm module connector.
5. Test the object sensor supply voltage circuit between the each sensor and the front and rear object module for a short to ground, a high resistance, or an open. Verify that a short to ground, a high resistance, or an open does not exist.
- If any of the above conditions are found make the appropriate repair.
6. Reconnect all components. Ignition ON, use the scan tool to clear the DTCs then recheck for DTCs. Verify DTC B138A does not set.
- If DTC B138A was current replace the front and rear object alarm module.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References for Front and Rear Object Alarm Module Replacement, setup, and programming.