Before starting any work, you should disable the mechanism through the blog post center. The message facility is situated on the tool cluster and displays necessary information with a consistent monitoring of vehicle systems. Pick display functions on the message facility for a display of sta
tus behavior by a quick chime. The device will additionally notify the driver of potential auto problems v a screen of system warnings followed by a long indicator chime. The message center is supplied to disable and allow the vehicle air suspension system. When the driver elects come disable the air suspension system, the message facility sends a post over the High speed Controller Area Network (HS-CAN) bus come the waiting suspension module. As soon as the message is received, the air suspension module will take no further action to inflate or deflate the wait springs. The device will default to ON as soon as the ignition vital is cycled.

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Turn the ignition come the top top position, close all doors and clear warnings.Select the SETUP control role on the post center.Select the wait SUSPENSION role to display screen the current status of the air suspension system.Press the RESET regulate to revolve the waiting suspension turn off or ON.

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

The mechanism uses two ride elevation sensors placed to the behind axle. The voltage output decreases (goes from high come low) as the suspension system raises the vehicle. The calculation voltage is in between 0.5 and also 4.5 volts. These signals are sent out to the car Dynamics Module (VDM).

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

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


When the crucial is in the top top position, the pack leveling feature instantly makes adjustments to the vehicle height so that the vehicle is constantly at target elevation and consistent front-to-rear vehicle mindsets are preserved when tons change.
The device will collection C- or chassis codes that will certainly be set if the system notices abnormal behavior. This codes generally start C17XX. Criteria for these codes typically involve a ride height sensor detecting to change in suspension elevation if the compressor or solenoids space activated.


Scan devices are important for functioning on some systems. Some intensified scan tools have the right to observe PIDs for the waiting ride mechanism like valve operation, modes and also vehicle position. Some new vehicles, prefer GM, have actually a calibration procedure for the ride regulate system.

The Expedition’s journey height and trim have the right to be calibrated with a scan tool. No calibrating the ride elevation can an outcome in suspension and also tire damage. To execute this the automobile must it is in on a level surface. The ride elevation is measured and also the scan tool deserve to vent or fill the correct bag.

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Compressor Problems


The heart of an wait ride device is the piston, piston ring and cylinder. What hastens the fail of the piston ring is heat. The mechanism is dry and no lubricants defend the piston. The VDM manage modules regulate how long the compressor will run to store temperatures in a designated range. The manage module will certainly look at ambient temperature and also other determinants to recognize when and also how lengthy the compressor should run to control the heat.