Before starting any work, you have to disable the device through the post center. The message center is situated on the tool cluster and displays vital information v a constant monitoring of auto systems. Pick display features on the message facility for a screen of sta
tus behavior by a brief chime. The system will also notify the driver that potential vehicle problems v a screen of mechanism warnings complied with by a long indicator chime. The message facility is supplied to disable and permit the vehicle air suspension system. Once the driver elects come disable the waiting suspension system, the message facility sends a post over the High speed Controller Area Network (HS-CAN) bus come the wait suspension module. When the post is received, the wait suspension module will certainly take no further activity to inflate or deflate the wait springs. The mechanism will default to ON once the ignition vital is cycled.

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Turn the ignition to the on position, close every doors and clear warnings.Select the SETUP control duty on the post center.Select the wait SUSPENSION function to display the existing status that the wait suspension system.Press the RESET manage to rotate the waiting suspension turn off or ON.

The air bag and also shock absorber deserve to be separated. Make sure you know the orientation of the upper mount and also air spring prior to you take it the assembly apart. Come deflate the spring, eliminate the air heat from the solenoid, remove the retaining clip and rotate the solenoid counter-clockwise. Air should rush out. The o-rings top top the shaft and also upper mountain should always be replaced and also lubricated v a silicone-based spray lubricant. These help to seal the unit from exterior debris. If you are just replacing the air spring, make sure the body of the shock is really clean.

The mechanism uses two ride height sensors mounted to the rear axle. The voltage output decreases (goes from high to low) as the suspension device raises the vehicle. The output voltage is in between 0.5 and 4.5 volts. This signals are sent out to the automobile Dynamics Module (VDM).

Testing this sensors deserve to be done with a meter, border or scan tool. V a meter, it is possible to observe transforms in the voltage or resistance.

The wait bags have solenoids an installed to the next that allow the bladder to either fill or compress. There is no waiting reservoir ~ above this system.


When the an essential is in the on position, the fill leveling feature automatically makes adjustments come the car height so the the auto is constantly at target elevation and continuous front-to-rear vehicle attitudes are maintained when lots change.
The device will set C- or chassis codes that will certainly be collection if the device notices abnormal behavior. This codes frequently start C17XX. Criteria for these codes typically involve a ride elevation sensor detecting to readjust in suspension elevation if the compressor or solenoids space activated.


Scan devices are essential for working on some systems. Some amplified scan tools can observe PIDs because that the air ride mechanism like valve operation, modes and also vehicle position. Some new vehicles, prefer GM, have actually a calibration process for the ride control system.

The Expedition’s ride height and trim have the right to be calibrated through a scan tool. Not calibrating the ride height can result in suspension and also tire damage. To perform this the car must be on a level surface. The ride elevation is measured and the scan tool deserve to vent or fill the exactly bag.

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Compressor Problems


The love of an air ride system is the piston, piston ring and cylinder. What hastens the failure of the piston ring is heat. The device is dry and no lubricants safeguard the piston. The VDM manage modules regulate just how long the compressor will run to store temperatures in a designated range. The control module will certainly look at ambient temperature and other factors to recognize when and how lengthy the compressor need to run to manage the heat.