2012 Volvo XC70 Owner's Manual - Page 168

04 Comfort and driving pleasure City Safety™ Limitations The sensor used by City Safety™ is designed to detect cars and other larger motor vehicles ahead of your vehicle in both daylight and darkness. However, there are certain limitations and the laser sensor's function may be reduced by, for example, heavy rain or snowfall, or by dense fog or thick, blowing dust or snow. Condensation, dirt, ice or snow on the windshield may also interfere with the sensor's function. Objects such as warning flags hanging from long objects on the roof or accessories such as auxiliary lights or protective arches on the front of the vehicle that are higher than the hood may also impede the sensor's function. Braking distance to the vehicle ahead increases on slippery road surfaces, which may reduce City Safety's capacity to avoid a collision. In situations like this, the DSTC system (see page 148) will help provide the best possible braking capacity and stability. City Safety™ emits infrared light and measures the way in which the light is reflected. Therefore, vehicles or objects with low-reflective surfaces may not be detected. Normally, the license plate and taillight reflectors give the rear section of a vehicle ahead sufficient reflective surfaces to be detected. NOTE Cause The area of the windshield in front of the sensor is dirty or covered by ice or snow. The laser sensor's field of view is obstructed. Action Clean the windshield or remove the ice/snow. • • • Keep the windshield in front of the laser sensor free of ice, snow, dirt, etc. See page 167. Snow or ice on the hood deeper than 2 inches (5 cm) may obstruct the sensor. Keep the hood free of ice and snow. Do not mount or in any way attach anything on the windshield that could obstruct the laser sensor. Remove the obstruction. 04 Troubleshooting If Windscreen Sensors blocked appears in the information display, this indicates that the City Safety™ laser sensor is obstructed in some way and cannot detect vehicles ahead of you, which means that the system is not functioning. However, this message will not be displayed in all situations in which the sensor is obstructed. For this reason, the driver must ensure that the area of the windshield in front of the sensor is always kept clean. The following table shows some of the situations that can cause the message to be displayed and suggested actions. CAUTION If a crack, scratch or stone chip should occur in the section of the windshield in front the laser sensor and covers an area of approximately 1/50 x 1/10 in. (0.5 x 3 mm) or larger, contact a trained and qualified Volvo service technician to repair or replace the windshield (see the illustration showing the location of the sensor on page 167). Failing to do so may result in reduced City Safety™ functionality. To help prevent reduced functionality, please also observe the following: • • If the windshield is replaced, use the same type or a windshield approved by Volvo. When replacing windshield wipers, use the same type or ones approved by Volvo. 168