GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2006 🢒 Lucerne 🢒 Vehicle Control Systems 🢒 Computer/Integrating Systems 🢒 DTC B1E3A

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC B1E3A 03: Sensor Power Circuit Voltage Below Threshold

DTC B1E3A 07: Sensor Power Circuit Voltage Above Threshold

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 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

B1E3A 03

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

B1E3A 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 instrument panel (I/P) to scroll SERVICE PARK ASSIST message on the driver information center (DIC), and the chime will sound.

Conditions for Clearing the DTC
    • The DTC becomes history when the conditions for setting the DTC are no longer present.
    • The object alarm module receives a clear code command from the scan tool.

Reference Information

Schematic Reference

Object Detection Schematics

Connector End View Reference

Object Detection Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing
  1. Ignition ON and the scan tool installed, verify that DTC B1325 is not current.
    2. ⇒If current, refer to DTC B1325 .
  2. Ignition ON and the scan tool installed, verify that DTC B0958, B0959, B0960 or B0961 is not current.
    3. ⇒If current, refer to DTC B0958, B0959, B0960, or B0961 .
  3. Ignition ON and with the transmission range in REVERSE, verify that the scan tool Sensor Feed Voltage Output parameter is between 7.2-9.2 volts.
    4. ⇒If less than 7.2 volts, 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.
    ⇒If greater than 9.2 volts, test the supply voltage circuit for a short to voltage. If the circuits test normal, replace the object alarm module.
  4. If all circuits test normal, test or replace the suspect object alarm sensor for the rear object alarm system.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for object alarm module replacement, setup, and programming