The driver controls are located at center of instrument panel. They consist of an up and down height control switch, an inhibit switch, and a height setting indicator. The height control switch is a press and release rocker switch. EAS system will not respond until switch is released.
When a height control switch is pressed, a ride height indicator light will illuminate. These indicator lights include high, standard, low, and access. When inhibit switch is activated, a telltale light will illuminate. An instrument pack (instrument cluster) warning light will illuminate, during vehicle operation, when ride height is set or flash when extended ride height is set. This light will also illuminate when an EAS system fault is detected. All lights will illuminate as a bulb check, when ignition is turned on, and until 2 seconds after the engine is started.
RIDE HEIGHT POSITIONS
There are 5 selectable ride height position settings plus a self-leveling capability and an automatic extended ride height. Ride height positions are controlled by the EAS control unit according to design presets or by the driver selection. Current vehicle height is signaled by 4 height sensors located at each wheel to EAS control unit. EAS control unit adjusts each air spring independently.
As weight is added or removed from vehicle, the self-leveling system detects body lean and will automatically compensate for it. The EAS control unit will level the vehicle according to the height of the lowest corner for 20 seconds each time the driver exits vehicle and closes the doors.
The EAS control unit rechecks vehicle height every 6 hours and will make corrections up to 0.31" (8.0 mm), as necessary. When unloading through the tailgate, EAS control unit will compensate for decreased load when tailgate is closed. When vehicle is parked on an uneven surface or with a wheel(s) on a curb, self-leveling will lower vehicle to the lowest spring height.
Standard Ride Height
When inhibit switch is off (unlatched) and vehicle speed is less than 50 MPH, the standard ride height indicator will be illuminated. Standard vehicle ride height is maintained under all load conditions. Standard vehicle ride height is about 71.6" (1818 mm), measured on a flat surface with properly sized tires at correct inflation.
Low Ride Height
When vehicle exceeds 50 MPH for more than 30 seconds and inhibit switch is off (unlatched), low ride height will automatically be selected by EAS control unit. During height change from standard to low ride height, low ride height indicator will flash. Standard ride height indicator will be illuminated until low ride height change is completed.
When vehicle speed decreases to less than 35 MPH for at least 30 seconds, ride height will change back to standard height. Ride height can be manually changed between standard and low ride heights regardless of vehicle speed. If inhibit switch is engaged (latched), low ride height will be maintained regardless of vehicle speed. Low ride height is about 1.0" (25 mm) less than standard ride height.
NOTE:If a door or tailgate is opened during height change from standard ride height to access mode, the height change will be halted. If door or tailgate is closed within 30 seconds, height change will resume. After 30 seconds, height change will have to be restarted.
Access Mode Height
The access mode is used to ease access into and out of the vehicle. With vehicle parked, doors and tailgate closed, parking brake set, foot brake released and transmission selector in Park, press and release down switch. Access mode indicator will flash and vehicle will lower to access mode height. When vehicle is fully lowered, access mode indicator light will illuminate and standard ride height light will go out.
Access mode can be activated about 40 seconds before stopping vehicle and about 40 seconds after turning engine off. Vehicle will change to standard ride height when vehicle is driven or by closing doors, starting engine and pressing up switch. Access mode height is about 2.6" (65 mm) less than standard ride height.
Crawl Mode Height
Crawl mode is used in areas where height is restricted. To set crawl mode, ensure inhibit switch is released (unlatched) and select access mode. See ACCESS MODE HEIGHT. When access height is attained, press inhibit switch (latch). The inhibit indicator will illuminate and the message center will beep 3 times and display AIRSUS ISOLATED message. Vehicle is now locked at access mode height.
Maximum speed in crawl mode is 20 MPH. When vehicle speed reaches 10 MPH, the message center will beep 3 times and display SLOW 20 MPH (32 KM/H) MAX. If vehicle speed exceeds 25 MPH, vehicle ride height will increase to low profile and flash low warning indicator. When vehicle speed decreases to 20 MPH, vehicle will lower to access mode height and access mode indicator will illuminate. When vehicle speed decreases to 5 MPH, the message center will beep 3 times and display AIRSUS ISOLATED. To cancel crawl mode, release inhibit switch or depress up switch. Crawl mode height is about 2.6" (65 mm) less than standard ride height.
High Ride Height
High ride height is used for increased ground clearance during off road operation or when wading through water. When vehicle is in standard ride height and speed is less than 35 MPH, press and release up switch. During height change from standard to high ride height, high ride height indicator will flash. Standard ride height indicator will be illuminated until high ride height change is completed. If vehicle speed exceeds 35 MPH, vehicle will return to standard ride height. High ride height is about 1.6" (40 mm) more than standard ride height.
Extended Ride Height
Extended ride height is selected by EAS control unit when chassis is grounded leaving a wheel unsupported. EAS control unit will attempt to lower vehicle. When no height change is detected, EAS control unit will inflate air spring until tire makes contact. Extended ride height position will be maintained for 10 minutes and then returned to standard ride height. Pressing down switch will lower vehicle to high ride height. If vehicle speed or detected speed (i.E, wheel spin) exceeds 35 MPH, vehicle will immediately be lowered to standard ride height. Extended ride height is about 2.75" (70 mm) more than standard ride height.
Tuesday, January 26th, 2010 AT 5:09 AM