For 1990-2009 cars

## Rear Park Assist Warning Buzzer Sounds Continuously Genuine Accessory

### Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

### Circuit/System Description

The rear park assist system (RPA) is designed to assist the driver when reversing and should not be used as a substitute for safe driving practices. The RPA is equipped with a module, a warning buzzer and ultrasonic sensors. The ultrasonic sensors operate both as transmitters and receivers of ultrasonic signals. The driver is alerted to approaching objects by a sequence of pulses or continuous tones from the warning buzzer. The warning buzzer could sound continuously in the event of the following:

• | RPA sensor falsely obstructed.

• | RPA sensors faulty/disconnected at RPA module.

• | Warning buzzer harness faulty.

### Reference Information

#### Schematic Reference

Object Detection Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

1. Ensure parking sensors are clean of road dirt.
2. Ensure parking sensors are not damaged.
3. Verify parking sensors are correctly installed.

⇒ | Refer to installation instructions.

4. Verify that the parking sensors are connected to the RPA module before turning the ignition ON and selecting reverse.

⇒ | If the parking sensors were disconnected, connect the parking sensors and reset the RPA module by selecting neutral and than reverse.

5. Disconnect X1 at the RPA module. Verify that a test lamp does not illuminate between the circuits below and ground:

• | RPA connector X1-3.

• | RPA connector X1-4.

⇒ | If the test lamp illuminates, test the warning buzzer wiring for a short to voltage.

### Repair Instructions

For component removal and installation refer to the accessory fitting instructions.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.