Before beginning any work, you should disable the system through the article center. The message facility is located on the tool cluster and displays vital information through a continuous monitoring of auto systems. Pick display features on the message center for a display screen of sta
tus behavior by a short chime. The device will also notify the driver the potential car problems through a screen of device warnings adhered to by a long indicator chime. The message center is supplied to disable and permit the car air suspension system. When the driver elects to disable the waiting suspension system, the message facility sends a article over the High speed Controller Area Network (HS-CAN) bus to the wait suspension module. As soon as the blog post is received, the waiting suspension module will take no further action to inflate or deflate the waiting springs. The mechanism will default come ON once the ignition key is cycled.

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Turn the ignition to the ~ above position, close every doors and clear warnings.Select the SETUP control role on the post center.Select the air SUSPENSION function to display the present status of the wait suspension system.Press the RESET manage to revolve the air suspension turn off or ON.

The waiting bag and also shock absorber can be separated. Make sure you know the orientation the the upper mount and air spring before you take the assembly apart. To deflate the spring, remove the air heat from the solenoid, eliminate the retaining clip and rotate the solenoid counter-clockwise. Air have to rush out. The o-rings on the shaft and also upper mount should constantly be replaced and also lubricated with a silicone-based spray lubricant. These assist to seal the unit from exterior debris. If girlfriend are just replacing the waiting spring, make certain the body of the shock is really clean.

The device uses two ride height sensors mounted to the rear axle. The voltage output decreases (goes indigenous high to low) as the suspension system raises the vehicle. The calculation voltage is between 0.5 and also 4.5 volts. This signals are sent to the car Dynamics Module (VDM).

Testing these sensors deserve to be done with a meter, border or scan tool. With a meter, that is possible to observe transforms in the voltage or resistance.

The air bags have solenoids placed to the side that permit the bladder to either to fill or compress. Over there is no air reservoir on this system.


When the key is in the ~ above position, the fill leveling feature immediately makes adjustments to the auto height so that the car is always at target height and constant front-to-rear vehicle perspectives are preserved when loads change.
The mechanism will collection C- or chassis codes that will be collection if the mechanism notices abnormal behavior. These codes generally start C17XX. Criteria because that these codes typically involve a ride elevation sensor detecting to change in suspension elevation if the compressor or solenoids space activated.


Scan devices are crucial for functioning on part systems. Some intensified scan tools deserve to observe PIDs because that the waiting ride device like valve operation, modes and also vehicle position. Some brand-new vehicles, prefer GM, have actually a calibration procedure for the ride control system.

The Expedition’s journey height and trim deserve to be calibrated v a scan tool. Not calibrating the ride elevation can an outcome in suspension and also tire damage. To execute this the car must it is in on a level surface. The ride elevation is measured and also the scan tool deserve to vent or to fill the correct bag.

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Compressor Problems


The love of an waiting ride device is the piston, piston ring and also cylinder. What hastens the fail of the piston ring is heat. The mechanism is dry and also no lubricants defend the piston. The VDM manage modules regulate how long the compressor will certainly run to keep temperatures in a designated range. The control module will certainly look at ambient temperature and also other factors to identify when and also how long the compressor have to run to manage the heat.