Lexus Car ES, IS, LS 1998-06

Rear Air Suspension

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Rear Pneumatic Cylinder



Removal & Installation

The rear pneumatic cylinder is installed in place of the strut component on the LS 400 and LS 430 models with air suspension.

2004-06 LS 430


Click image to see an enlarged view

Fig. Expanded view rear suspension-LS 430

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Bleed the air system from the suspension.
  4.  
  5. Remove or disconnect the following:

    Rear seat cushion and seat back
     
    Scuff plates
     
    Door opening weather strip
     
    Rear seat side covers
     
    Roof side garnish
     
    Center stop light assembly
     
    Package tray trim
     
    Tire and wheel assembly
     
    3 nuts and remove strut cap
     
    Turn control actuator clockwise 40 degrees and remove
     

  6.  
  7. Remove shock absorber cylinder assembly

    Support rear axle carrier with jack
     
    Rear tire house cover
     
    Air tube
     
    3 upper nuts on assembly
     
    Lower side nut
     
    Lower assembly
     
    O-rings
     

  8.  

To install:

  1. Install or connect the following:
    NOTE
    Start engine and allow air struts to fill. Checks for leaks


    NOTE
    Lower vehicle until all wheels are on the ground. Jounce several times to stabilize.



    2 new O-rings and install connector No 2
     
    Temporarily install lower side nut
     
    Raise axle carrier and install air tube
     
    Control actuator until response is felt, turn approx. 40 degrees
     
    Control arm connector
     
    Shock absorber cap with 3 nuts. Tighten to 18 ft. lbs (25 Nm)
     



    Rear wheels
     

  2.  
  3. Remove the rear wheel and support
  4.  
  5. Jack up the rear axle carrier
  6.  
  7. Install or connect the following:

    Tighten the lower nut. Tighten to 52 ft. lbs. (70 Nm)
     
    Rear wheel
     

  8.  
  9. Adjust vehicle height
  10.  
  11. Adjust rear wheel alignment.
  12.  

LS 400 And 2001-03 LS 430


Click image to see an enlarged view

Fig. Pneumatic cylinder (strut) component overview (air suspension)

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Bleed the air system from the suspension.
  4.  
  5. Remove or disconnect the following:

    Rear seat cushion and seat back
     
    Package tray trim
     
    Trunk trim panel. Move the height control switch, located in the trunk area, to the OFF position.
     
    Tire and wheel assembly
     
    Rear halfshaft
     
    Stabilizer links from the stabilizer bar
     
    Anti-lock Brake System (ABS) speed sensor and wiring harness
     
    Brake caliper bracket from the rear axle carrier. Do NOT disconnect the brake line.
     

  6.  
  7. Place matchmarks on the height control sensor link and bracket. Disconnect the height control sensor link from the No. 1 lower control arm.
  8.  
  9. Support the rear axle assembly with a lifting device.
  10.  
  11. Remove or disconnect the following:

    Nut on the lower side of the shock absorber. Do NOT remove the bolt.
     
    Grommet and disconnect the air tube from the shock absorber
     
    Actuator cover from the strut tower by removing the 3 nuts
     
    Actuator electrical connector from the top of the strut
     
    Actuator by removing the 2 nuts
     
    3 upper mounting nuts holding the strut to the strut tower
     

  12.  
  13. Lower the rear axle assembly
  14.  
  15. Remove or disconnect the following:

    Bolt on the lower side of the shock absorber
     
    Pneumatic cylinder strut assembly from the vehicle
     
    Suspension support from the strut assembly by removing the 3 nuts
     

  16.  
  17. If discarding the pneumatic cylinder, perform the following:
    1. Using a screwdriver, depressurize the air from inside the cylinder.
    2.  
    3. Drill a hole in the shaded area shown in the illustration and remove the gas inside.
      CAUTION
      The gas coming out is harmless, but be careful of chips which may fly up when drilling.

    4.  

  18.  

To install:

  1. Install or connect the following:

    Suspension support to the pneumatic cylinder (strut) and tighten the nuts to 27 ft. lbs. (36 Nm)
     
    Strut assembly to the vehicle and tighten the upper mounting nuts to 47 ft. lbs. (64 Nm)
     

  2.  
  3. Match the holes in the pneumatic cylinder with the holes in the suspension control actuator.
  4.  
  5. Install or connect the following:

    Actuator and tighten the mounting nuts to 69 inch lbs. (8 Nm)
     
    Actuator cover and tighten the 3 nuts to 18 ft. lbs. (25 Nm)
     
    New O-rings and connect the air line to the shock absorber. Tighten the fitting to 13 ft. lbs. (18 Nm).
     
    Strut to the rear axle carrier. Insert the bolt from the vehicle's rear and temporarily tighten the nut.
     
    Height control sensor link to the No. 1 lower control arm. Mounting nut: 48 inch lbs. (5 Nm).
     
    Rear brake caliper to the rear axle carrier and tighten the mounting bolts to 77 ft. lbs. (104 Nm)
     
    ABS speed sensor and wiring harness
     
    Stabilizer bar link and tighten the nut to 48 ft. lbs. (65 Nm)
     
    Halfshaft
     
    Actuator electrical connector to the top of the strut
     
    Tire
     

  6.  
  7. Move the height control switch to the ON position. Start the engine and fill the pneumatic cylinder with air.
  8.  
  9. Bounce the vehicle up and down several times to stabilize the suspension.
  10.  
  11. Turn the suspension height control to the OFF position.
  12.  
  13. Remove the tire and wheel assembly.
  14.  
  15. Support the rear axle carrier with a lifting device. Tighten the lower strut bolt to 101 ft. lbs. (137 Nm).
  16.  
  17. Install or connect the following:

    Package tray trim
     
    Rear seat cushion and seat back
     

  18.  
  19. Turn the suspension control switch to the ON position.
  20.  
  21. Check the wheel alignment.
  22.  

 
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