CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Spring

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Depressurizing The System



To depressurize the Air Suspension System, install the scan tool with key in the ON position. Go to the special functions menu of the air suspension section and follow the on screen directions. The suspension will deflate the air springs until the suspension is on the jounce bumpers.

Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Depressurize the air suspension.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Remove the rear tire and wheel assembly.
  8.  
  9. Remove the rear leveling sensor link from the control arm.
  10.  
  11. Disconnect the air supply line at the air spring.
  12.  
  13. Remove lower shock bolts.
  14.  
  15. Remove the rear adjusting link mounting nut.
  16.  
  17. Use the J 24319-B to remove the adjusting link from the control arm.
  18.  
  19. Place a suitable support under the control arm.
  20.  
  21. Lower the control arm and remove the air spring.

    Click image to see an enlarged view

    Fig. View of rear air spring removal

  22.  

To install:

  1. Carefully install the air spring into the seat.
  2.  
  3. Connect the air supply line at the air spring.
  4.  
  5. Use support jack to raise the control arm into position.
  6.  
  7. Tighten the lower shock mounting bolts to 18 ft. lbs. (25 Nm).
  8.  
  9. Remove the support jack.
  10.  
  11. Install the rear adjusting link and tighten the nut to 22 ft. lbs. (30 Nm).
  12.  
  13. Install the rear leveling sensor link from the control arm.
  14.  
  15. Tighten the air spring leveling sensor nut to 80 inch lbs. (9 Nm).
  16.  
  17. Install the rear tire and wheel assembly.
  18.  
  19. Lower the vehicle.
  20.  
  21. Pressurize the air suspension system after the repair has been completed.
  22.  

Suspension Position Calibration



After Air Suspension Control Module (ASCM), or suspension position sensor replacement, or if the vehicle exhibits an uneven rear suspension position, the following calibration procedure must be performed.

  1. Before proceeding with the procedure below, ensure:

    The vehicle is parked on level ground.
     
    There are no stored DTCs in the ASCM.
     
    If the vehicle has been lowered from a hoist, roll the vehicle back and forth 2 full tire revolutions to ensure the suspension is not bound.
     
    All tire pressures are set to the recommended psi/kPa.
     
    There are no occupants in the vehicle.
     
    There are no heavy objects stored in the luggage compartment.
     

  2.  
  3. Install a scan tool.
  4.  
  5. Turn ON the ignition, with the engine OFF .
  6.  
  7. Using 2 adjustable lifting devices, support the rear of the vehicle at the lifting points forward of the rear wheel arches.
  8.  
  9. Depressurize the air suspension system, allowing the weight of the vehicle to rest on the lifting devices.
  10.  
  11. Measuring from the wheel center to the wheel arch, ensure a 18.1 inch (46 cm) distance between the 2 points for both left and right sides. Adjust the lifting devices as needed.
  12.  
  13. With the scan tool select Suspension, and then Air Suspension.
  14.  
  15. Select Special Functions, Air Suspension Control Module.
  16.  
  17. Select Suspension Position Calibration and press the Set key.
  18.  
  19. Remove the lifting devices.
  20.  
  21. Cycle the ignition OFF , then start the engine and allow to run for 1 minute. Verify the air suspension system is functioning properly.
  22.  
  23. If additional adjustments are required for slight variation in the trim height after completing the Suspension Position Calibration, use the Suspension Calibration Adjustment procedure under Special Functions and follow the Tech2 on-screen instructions to adjust each rear wheel to the correct trim height. The Suspension Calibration Adjustment will increase or decrease the left and/or right rear wheel center to wheel arch measurement from 0.25 inch (0.64 cm) to as much as 1 inch (2.54 cm) to correct the variation in the trim height.
  24.  

Suspension Pressurization




WARNING
Any time the air suspension system has been depressurized, it is necessary to follow the steps below to avoid air spring damage upon lowering the vehicle and adding weight to the rear suspension components.

  1. While the vehicle is raised, ensure that the lower end of the air springs are completely engaged in the spring supports on the lower control arm.
  2.  
  3. Lower the vehicle but do not allow the vehicles tires to contact the ground.
  4.  
  5. Turn the ignition ON , with the engine OFF .
  6.  
  7. Install a scan tool.
  8.  
  9. With the scan tool in hand, raise the vehicle.
  10.  
  11. With the scan tool select Special Functions.
  12.  
  13. Select Pressurize System.
  14.  
  15. Press the ON soft key and visually observe the springs as their air pressures inflate.
  16.  
  17. When the air spring inflation pressures have reached a pressure where there are no visible wrinkles, or folds in the air springs, press the OFF soft key. This function will also stop after 40 seconds.
  18.  
  19. Press the Exit key.
  20.  
  21. Lower the vehicle.
  22.  
  23. Cycle the ignition OFF , then back ON , with the engine ON to allow the air suspension system to regain the desired rear suspension position
  24.  

 
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