Before starting any work, you need to disable the system through the message center. The message facility is situated on the instrument cluster and displays necessary information through a consistent monitoring of auto systems. Select display features on the message facility for a display screen of sta
tus behavior by a short chime. The mechanism will additionally notify the driver the potential automobile problems with a display screen of system warnings followed by a long indicator chime. The message center is offered to disable and permit the vehicle air suspension system. Once the driver elects come disable the wait suspension system, the message center sends a message over the High rate Controller Area Network (HS-CAN) bus come the wait suspension module. When the blog post is received, the wait suspension module will certainly take no further action to inflate or deflate the waiting springs. The system will default come ON once the ignition vital is cycled.

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Turn the ignition come the top top position, close all doors and also clear warnings.Select the SETUP control duty on the post center.Select the air SUSPENSION function to screen the present status the the wait suspension system.Press the RESET regulate to revolve the air suspension off or ON.

The air bag and also shock absorber have the right to be separated. Make certain you understand the orientation of the top mount and air spring before you take it the assembly apart. Come deflate the spring, remove the air heat from the solenoid, eliminate the retaining clip and also rotate the solenoid counter-clockwise. Air need to rush out. The o-rings ~ above the shaft and upper mount should always be replaced and also lubricated with a silicone-based spray lubricant. These aid to seal the unit from outside debris. If friend are simply replacing the wait spring, make sure the human body of the shock is an extremely clean.

The device uses 2 ride height sensors an installed to the rear axle. The voltage output decreases (goes indigenous high come low) as the suspension device raises the vehicle. The calculation voltage is in between 0.5 and 4.5 volts. These signals are sent out to the vehicle Dynamics Module (VDM).

Testing these sensors have the right to be done with a meter, scope or scan tool. V a meter, the is possible to observe alters in the voltage or resistance.

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


When the vital is in the top top position, the pack leveling feature instantly makes adjustments come the vehicle height so that the automobile is constantly at target height and continuous front-to-rear vehicle attitudes are kept when loads change.
The device will set C- or chassis codes that will certainly be set if the system notices abnormal behavior. This codes frequently start C17XX. Criteria for these codes generally involve a ride height sensor detecting to readjust in suspension elevation if the compressor or solenoids are activated.


Scan devices are vital for functioning on some systems. Some amplified scan tools deserve to observe PIDs because that the waiting ride system like valve operation, modes and also vehicle position. Some brand-new vehicles, choose GM, have actually a calibration procedure for the ride regulate system.

The Expedition’s ride height and also trim can be calibrated v a scan tool. No calibrating the ride height can result in suspension and tire damage. To do this the vehicle must be on a level surface. The ride elevation is measured and the scan tool have the right to vent or to fill the exactly bag.

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Compressor Problems


The heart of an waiting ride system is the piston, piston ring and also cylinder. What hastens the fail of the piston ring is heat. The system is dry and also no lubricants safeguard the piston. The VDM regulate modules regulate how long the compressor will run to save temperatures in a designated range. The control module will certainly look in ~ ambient temperature and other determinants to recognize when and how lengthy the compressor must run to manage the heat.