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 Descriptor

DTC B0953 00: Park Assist Audio Output Circuit

### Circuit/System Description

The dual object detection system consists of an object alarm module, eight object alarm sensors, an object alarm speaker, and a switch. The object alarm speaker will sound as the vehicle approaches an object.

### Conditions for Running the DTC

Ignition RUN

### Conditions for Setting the DTC

The object alarm module has detected a malfunction.

### Action Taken When the DTC Sets

• | Park assist system is disabled.

• | The multifunction switch light will flash rapidly when the switch is pressed.

• | A chime will sound.

### Conditions for Clearing

The object alarm module clears the history DTC when a current DTC is not detected in 100 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

### Circuit/System Testing

1. Ignition OFF, disconnect the harness at the object alarm speaker.
2. Connect a test lamp between the voltage circuit terminal 1 and ground.
3. Ignition ON, engine OFF, transmission in REVERSE, the test lamp should illuminate.

⇒ | If the test lamp does not illuminate, test the voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.

4. Connect a test lamp between the low reference circuit terminal 2 and ground. The test lamp should not illuminate.

⇒ | If the test lamp illuminates, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.

5. Test for infinite resistance between the low reference circuit terminal 2 and ground.

⇒ | If less than the specified value test the low reference circuit for a short to ground. If the circuit tests normal, replace the object alarm module.

6. Ignition OFF, place an object behind the vehicle.
7. Connect a test lamp between the voltage circuit terminal 1 and low reference circuit terminal 2.
8. Ignition ON, engine OFF, transmission in REVERSE, the test lamp should illuminate.

⇒ | If the test lamp does not illuminate, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the object alarm module.

9. If all circuits test normal, test or replace the object alarm speaker.

### Component Testing

1. Ignition OFF, disconnect the harness at the object alarm speaker.
2. Apply 2.5 V to the voltage circuit terminal 1.
3. Apply ground to the ground circuit terminal 2, the object alarm speaker should sound.

⇒ | If the speaker does not sound replace the object alarm speaker.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for object alarm speaker replacement.