There is one at each wheel. here is some info
Vehicle Dynamic Suspension
The four wheel air suspension system is comprised of the following components:
- service switch
- control module
- two front height sensors
- one rear height sensor
- compressor and drier assembly (includes vent solenoid)
- air lines
- front and rear air spring and shock absorber assemblies
- four air spring solenoids
WARNING: The service switch for the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the jack storage area in the rear of the passenger compartment. Failure to do so may result in unexpected inflation or deflation of the air springs which may result in shifting of the vehicle during these operations.
WARNING: Do not remove an air spring under any circumstances when there is pressure in the air spring. Do not remove any components supporting an air spring without either exhausting the air or providing support for the air spring to prevent vehicle damage or personal injury.
Air Suspension Pneumatic Diagram
Item
Part Number
Description
1
5319
Air compressor and drier
2
5B322
Air line T-fitting
3
5B321
Air line union
4
—
Air line Y-fitting
5
18945/5311
Air spring and solenoid
Suspension Height Sensor
Removal and Installation
NOTE: Front shown, rear similar
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WARNING: The electrical power to the air suspension system must be shut off prior to hoisting, jacking or towing an air suspension vehicle. This can be accomplished by turning off the air suspension switch located in the LH quarter trim panel. Failure to do so may result in unexpected inflation or deflation of the air springs which may result in shifting of the vehicle during these operations.
Raise and support the vehicle. For additional information, refer to Section 100-02 .
- Disconnect the sensor arm.
3. Remove the bolts and the sensor.
4.
- Disconnect the electrical connector.
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Ride Height Adjustments
Special Tool(s)
Worldwide Diagnostic System (WDS)
418-F224
New Generation STAR (NGS) Tester
418-F052 or equivalent scan tool
Inflation and Deflation of the Air Suspension System
-
NOTE: Make sure that the air suspension switch is in the ON position
NOTE: Make sure that a battery voltage of at least 11 volts is maintained while carrying out this procedure.
Turn the ignition switch to the ON position.
- Connect scan tool to the data link connector (DLC).
- Select Air Suspension Control Module under Active Command Mode:
- VENT FRNT to deflate the front down.
- LIFT FRNT to inflate the front up.
- VENT REAR to deflate the rear down.
- LIFT REAR to inflate the rear up.
Calibration
Ride Height Resetting
-
NOTE: Make sure that the air suspension switch is in the ON position
NOTE: Make sure that a battery voltage of at least 11 volts is maintained while carrying out this procedure.
Turn the ignition to the ON position.
- Exit the vehicle, close all doors and allow the system to vent the vehicle down to kneel height (approximately 45 seconds).
- With the ignition remaining in the ON position, shift the vehicle into DRIVE and then back to PARK.
- Exit the vehicle, close all doors and allow the vehicle to pump to trim (approximately 45 seconds).
- Measure the ride height. For additional information, refer to Section 204-00 .
- Open the LF door.
- Connect scan tool to the data link connector (DLC).
- While outside of the vehicle, select the proper vehicle year, model and engine type.
- Select 4WAS module.
- Using the active command mode, vent or lift the vehicle to achieve the correct ride height.
- Select the "Save Calibration Values (Store Ride Height)" scan tool command to calibrate the 4WAS module.
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