For 1990-2009 cars

Depending on the model variant, the vehicle may be equipped with rear object detection. Rear object detection consists of rear object alarm sensors in the rear bumper, a rear object alarm module and a rear object alarm mounted behind the rear window shelf trim panel.

### Object Detection Monitoring

The object alarm sensors fitted to the vehicle are of the ultrasonic type. The object alarm sensors transmit ultrasonic radio waves which are reflected back to the object alarm sensors at different rates depending on the detected objects distance from the object alarm sensors. This change in signal is sent to the rear object alarm module, which in turn activates the rear object alarm. On high features vehicles it also sends a signal to the infotainment unit via the GMLAN. The infotainment unit not only provides an audible warning, but also a graphic display.

#### Object Detection System Tone Activation Rear

Distance MM | Duration ON (MS) | 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

### Rear Object Detection Activation

To activate the object detection system the following criteria must be met:

• | The LED in the object detection enable/disable switch will only illuminate if the system is active.

• | Ignition is ON.

• | Reverse is selected.

• | The handbrake is released.

Important: Once object detection is selected an audible confirmation tone will sound. If a confirmation tone does not sound there may be an object detection malfunction.

### Objects Attached to The Vehicle

Note If an attached object is detected, the object detection automatically deactivates completely, approximately 10 seconds after the vehicle’s forward speed exceeds 15 km/h. The object detection will be reactivated automatically when the object is removed or the ignition is switched OFF and then ON again.

### Adjustment For a Trailer Hitch

When a trailer hitch is fitted, the object detection can be adjusted to ensure that the trailer hitch is not detected as an object. This is achieved by adjusting the object detection sensor parameters for the extra length.

Important: This adjustment is for manufacturer approved trailer hitches. If a different trailer hitch is fitted, the system may detect it as an attached object and will be deactivated.

Enter the Customisation menu in the infotainment unit and select Tow Bar Att , Select Yes if a tow ball tongue/neck is attached or No if a tow ball tongue/neck is removed.