Procedures

AR32.22-P-1500-03T Fill the air spring in vehicle riding height position
- with CODE (489) Airmatic (semi-active air suspension)

Suspension Struts:

Component Identification:

The bolted connection (1) of the air spring (2) on the spring control arm (3) must be loose. The left and right air springs (2) must each be filled separately.

1 Attach compressed air connection to compressed air distributor of the rear axle
2 Prefill air spring (2) by means of STAR DIAGNOSIS (max. 0.5 bar): compressor running time or filling time approx. 2 s.
3 Position the transmission lifter (4) at the spring control arm (3).

Component Identification:

4 Measure angular position of rear axle shaft (65) using electronic inclinometer.

The connecting cable (086b) from the sensor (086a) must point towards the center of the vehicle otherwise an incorrect measurement ensues. The test points on the rear axle shaft (65) must be cleaned.

5 Raise the spring control arm (3) with the transmission jack (4) until the rear axle shaft (65) has reached the specified value in the design level. Specified value in design level: -1.2 degrees.
6 Fill air spring (2) to medium pressure using STAR DIAGNOSIS (2 bar): compressor running time or filling time approx. 10 s.

Component Identification:

7 Check the alignment of the air spring (2) in the vehicle riding height position.

The air spring (2) must be straight and parallel to the shock absorber (5). Observe dimensions (b, c):

Dimension (b) 36.4 mm
Dimension (c) 18.7 mm

The protective boot (6) of the air spring (2) must be free to move and as able to be lifted upwards off the inflated air spring bellows. The folds in the protective boot (6) must be correctly trained and must not have any intrusions (arrow), if necessary remove the intrusion by hand.

Component Identification:

8 If the air spring (2) is buckled, bleed all compression, lower spring control arm (3) with transmission jack (4), align air spring (2) and start new charging attempt.

Component Identification:

9 Tighten the bolted connection (1) of the air spring (2) at the spring control arm (3) in the vehicle riding height position.
10 Lower spring control arm (3) with transmission jack (4).
11 Fill air spring (2) using STAR DIAGNOSIS (5 bar): compressor running time or filling time approx. 20 s.

Component Identification:

12 Check the alignment of the air spring (2) at full rebound travel:

The air spring (2) forms a gentle curve relative to the damper (5). The protective boot (6) should not be in contact with the damper (5), and the inner air spring bellows should not press against the damper (5). The protective boot (6) of the air spring (2) must move freely and be able to be raised by the inflated air spring bellows. The folds in the protective boot (6) must be correctly trained and should not display any intrusions toward the inside, respond to requirement by removing intrusions by hand.

13 Read out the diagnostic trouble code memory using STAR DIAGNOSIS and erase if necessary.