For 1990-2009 cars

## Object Detection Description and Operation UFR

Table 1: | Rear Object Detection System Tone Activation
Table 2: | Front Object Detection System Tone Activation

The dual object detection system is designed to identify and notify the driver of an object in front and at the rear of the vehicle. The dual object detection system consists of an object alarm module, eight object alarm sensors, an object alarm speaker, and a switch. The distance and location of the object is determined by the eight object alarm sensors. Four object alarm sensors are located in the rear bumper and four are located in the front bumper.

### Object Alarm Module

The object alarm module provides an 8 V reference and a low reference to each of the object alarm sensors. The object alarm module contains the logic needed to receive the individual signals from each of the sensors and determine the location and distance of an object. As the vehicle gets closer to an object the object alarm speaker will sound.

### Object Alarm Sensors

The ultrasonic sensors are located in the front and rear bumpers of the vehicle. The sensors are used to determine the distance between an object and the bumper. When the transmission is in reverse the front and rear sensors are activated. If the front and rear sensors simultaneously detect an object at equal distances the rear sensors will be given priority. When the objects are not at equal distances the object closest to the vehicle will be given priority. Each sensor emits an ultrasonic frequency which is reflected off an object located behind or in front of the vehicle. The reflections are received by the sensors. The time difference between when the frequency was emitted and when the reflection is received is used to determine the distance to the object. This information is sent to the object alarm module.

### Object Alarm Speaker

The object alarm speaker will sound when the ultrasonic sensors detect an object in the vehicles path. The following tables shows the object distance from the vehicle and the tone duration of the object alarm speaker.

#### Rear Object Detection System Tone Activation

Object Distance (MM) | Tone Duration ON (MS) | Tone Duration OFF (MS)
--- | --- | ---
Less than 300 | Continuous |
300-600 | 75 | 75
600-900 | 75 | 150
900-1200 | 75 | 225
1200-1500 | 75 | 300
1500-1800 | 75 | 375
1800-2100 | 75 | 450
2100-2500 | 75 | 525

#### Front Object Detection System Tone Activation

Object Distance MM | Tone Duration ON (MS) | Tone Duration OFF (MS)
--- | --- | ---
Less than 300 | Continuous | 0
300-600 | 75 | 75
600-900 | 75 | 225
900-1200 | 75 | 450

### Object Detection Switch

The object detection switch is equipped with a light that will illuminate when the system is activated. The switch allows the driver to enable or disable the object detection system. The switch light will flash rapidly when it is pressed if there is a malfunction present with the object detection system.

### Object Detection Operation

The object detection system is automatically activated when the vehicle ignition is on, the park brake is released and the transmission is in reverse or drive. When the transmission is in drive the front sensors will activate and the object alarm speaker will sound. If the transmission is in reverse the front and rear sensors will activate and the object alarm speaker will sound. If the object alarm speaker does not sound there is a malfunction with the object detection system. The object detection system will automatically deactive when the vehicle speed exceeds 25 km/h (15 mph).

## Object Detection Description and Operation UVC

### Rear Vision Camera System Operation

The rear vision camera system consists of a video camera located at the rear of the vehicle and the navigation radio display.

When the transmission is placed into REVERSE, a 12 V signal is sent to the rear vision camera by the body control module (BCM). This signal indicates to the camera that the vehicle is in reverse and image display is requested. The rear vision camera receives ignition voltage and a constant ground to power the camera. Video signal + and video signal - circuits carry the video image from the rear vision camera to the navigation radio. Additionally, the video signal circuits are shielded to prevent any interference which may lead to a loss of video signal resolution and a degraded video image. The shield is provided a ground path by the rear vision camera.

The following conditions may cause a degraded rear vision camera image:

• | Ice, snow, or mud has built up on the rear vision camera

• | Dark conditions

• | Extreme light conditions, such as glare from the sun or the headlights of another vehicle

• | Damage to the rear of the vehicle

• | Extreme high temperatures or extreme temperature changes