For 1990-2009 cars

### 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

### 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, B1E3A 07 | B0958 06, B0959 06, B0960 06, B0961 06 | B1E3A 07 | --
Left Rear Object Sensor Signal | B0958 06 | B0958 06 | B0958 01 | B0958 08, B0958 21
Left Middle Rear Object Sensor Signal | B0959 06 | B0959 06 | B0959 01 | B0959 08, B0959 21
Right Middle Rear Object Sensor Signal | B0960 06 | B0960 06 | B0960 01 | B0960 08, B0960 21
Right Rear Object Sensor Signal | B0961 06 | B0961 06 | B0961 01 | B0960 08, B0960 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 8 volts to the object sensors via the 8 volt reference circuit and provides ground via the low reference circuit. The object alarm module triggers the sensors in a sequential loop. After each sensor transmits, the object alarm module uses the sensor ring received though the signal circuit to calculate the distance and position of an object.

### Conditions for Running the DTC

• | DTC B1325 is not set

• | Ignition voltage is between 9-16 volts

• | The vehicle is in REVERSE

### Conditions for Setting the DTC

#### B1E3A 03

The object alarm module has detected the 8-volt reference circuit is less than 7.2 volts.

#### B1E3A 07

The object alarm module has detected the 8-volt reference circuit is greater than 9.2 volts.

### Action Taken When the DTC Sets

• | Parking assist is disabled.

• | The object alarm module commands the red indicator ON.

• | The object alarm module sends a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC) and a chime will sound.

### Conditions for Clearing

• | The DTC will transition to history when the fault is no longer present.

• | A history DTC will clear after 100 malfunction-free ignition cycles.

### 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

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

Ignition ON, transmission in REVERSE, verify that the scan tool Sensor Voltage Feed Output parameter is 7.2-9.2 volts.

### Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at each of the object sensors.
2. Ignition ON, verify DTC B1E3A is not set as current.

⇒ | If the DTC is set, test the 8-volt reference circuit terminal 1 for a short to voltage, short to ground, or an open/high resistance. If circuit tests normal, replace the object alarm module.

3. Install each sensor harness connector one at a time, checking DTCs after each sensor is connected. Verify DTC B1E3A is not set as current.

⇒ | If the DTC is set, replace the object sensor that was connected immediately before the DTC set.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Rear Object Sensor Replacement

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