2009 Ford Explorer Sport Trac Owner Guide 2nd Printing - Page 251

Driving The RSS automatically turns on when the gear selector is placed in R (Reverse) and the ignition is on. A control in the message center allows the driver to disable the system only when the ignition is on and the gear selector is in R (Reverse). Refer to Message center in the Driver Controls chapter for more information. Keep the RSS sensors (located on the rear bumper/fascia) free from snow, ice and large accumulations of dirt (do not clean the sensors with sharp objects). If the sensors are covered, it will affect the accuracy of the RSS. If your vehicle sustains damage to the rear bumper/fascia, leaving it misaligned or bent, the sensing zone may be altered causing inaccurate measurement of obstacles or false alarms. FOUR-WHEEL DRIVE (4WD) OPERATION (IF EQUIPPED) WARNING: For important information regarding safe operation of this type of vehicle, see Preparing to drive your vehicle in this chapter. Four-wheel drive (4WD) supplies power to all four wheels. Do not use 4X4 High or 4X4 Low on dry, hard surfaced roads. Doing so will produce excessive noise, increase tire wear and may damage drive components. 4X4 High and 4X4 Low are only intended for consistently slippery or loose surfaces. The use of 4X4 High or 4X4 Low on these surfaces may produce some noise, such as occasional clunks, but will not damage the drive system. If equipped with the Electronic Shift 4WD System, and 4WD Low is selected while the vehicle is moving above 3 mph (5 km/h), the 4WD system will not engage. This is normal and should be no reason for concern. Refer to Shifting to/from 4WD Low for proper operation. System indicator lights • 4X4 - momentarily illuminates when the vehicle is started. Illuminates when 4X4 HIGH (4WD High) is selected. • 4X4 LOW - momentarily illuminates when the vehicle is started. Illuminates when 4X4 LOW (4WD Low) is selected. 4x4 4x4 LOW 251 2009 07+ Explorer Sport Trac (esp) Owners Guide, 2nd Printing USA (fus)