Before beginning any work, you have to disable the system through the article center. The message center is located on the instrument cluster and also displays essential information with a continuous monitoring of automobile systems. Select display attributes on the message facility for a display of sta
tus behavior by a short chime. The system will likewise notify the driver of potential car problems with a screen of mechanism warnings adhered to by a long indicator chime. The message center is used to disable and permit the automobile air suspension system. Once the driver elects come disable the waiting suspension system, the message facility sends a article over the High speed Controller Area Network (HS-CAN) bus come the wait suspension module. When the message is received, the air suspension module will certainly take no further action to inflate or deflate the air springs. The device will default come ON once the ignition key is cycled.

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Turn the ignition to the on position, close all doors and clear warnings.Select the SETUP control role on the message center.Select the wait SUSPENSION role to screen the current status that the air suspension system.Press the RESET regulate to turn the wait suspension turn off or ON.

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

The device uses two ride height sensors mounted to the rear axle. The voltage output decreases (goes from high to low) together the suspension device raises the vehicle. The calculation voltage is between 0.5 and 4.5 volts. These signals are sent to the auto Dynamics Module (VDM).

Testing these sensors deserve to be done through a meter, limit or scan tool. Through a meter, that is feasible to observe alters in the voltage or resistance.

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


When the vital is in the top top position, the fill leveling feature automatically makes adjustments to the automobile height so the the car is constantly at target height and constant front-to-rear vehicle attitudes are preserved when tons change.
The device will set C- or chassis password that will be collection if the device notices abnormal behavior. This codes commonly start C17XX. Criteria for these codes frequently involve a ride height sensor detecting to readjust in suspension elevation if the compressor or solenoids room activated.


Scan devices are crucial for functioning on part systems. Some magnified scan tools can observe PIDs because that the air ride system like valve operation, modes and vehicle position. Some new vehicles, favor GM, have actually a calibration procedure for the ride control system.

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

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Compressor Problems


The love of an air ride device is the piston, piston ring and cylinder. What hastens the failure of the piston ring is heat. The device is dry and also no lubricants protect the piston. The VDM regulate modules regulate just how long the compressor will run to keep temperatures in a designated range. The regulate module will certainly look in ~ ambient temperature and other components to recognize when and also how lengthy the compressor should run to regulate the heat.