Level Control Solenoid Valve: Service and Repair

1. Disconnect battery ground cable.
2. Ensure air suspension service switch is in the ON position.
3. Turn ignition switch to the OFF position.
4. Install a suitable battery charger to reduce battery drain.
5. Open access door in LH luggage compartment trim panel to plug Star tester into air suspension diagnostic wiring harness connector.
6. The Star test button should be in the hold (up) position.
7. Depress Star test button so that it is in the TEST (down) position.
8. At this time the air suspension control module will start sending out spring fill selection codes to be displayed on the Star tester. These codes will be displayed in a scrolling manner. Note the following:
a. Code 21, describes the right front vent.
b. Code 22, describes the left front vent.
c. Code 23, describes the right rear vent.
d. Code 24, describes the right front compress.
e. Code 25, describes the left front compress.
f. Code 26, describes the right rear compress.
g. Code 27, describes the left rear vent.
h. Code 28, describes the left rear compress.
9. Select desired spring fill operation by releasing Star button when desired code is displayed. As long as the Star test button is released the desired operation (inflation or deflation) will continue. To stop a selected operation, depress Star button back down to Test position. At this time spring fill codes will again be displayed in a scrolling manner. When deflating air springs, have vehicle raised off the ground.
10. Turn the air suspension switch to the OFF position.
11. Remove wheel and tire assembly.
12. Disconnect electrical connector and then the air line.
13. Remove solenoid clip. The air spring solenoid valve has a two stage solenoid pressure relief fitting similar to a radiator cap. A clip is first removed, and then rotation of the solenoid out of the spring releases air from the assembly before the solenoid can be removed.
14. Rotate solenoid counterclockwise to the first stop.
15. Pull solenoid straight out slowly to second stop to bleed air from system. Do not fully release solenoid until all air is completely bled from system.
16. After air is bled from system, rotate solenoid counterclockwise to the third stop and remove solenoid from air spring assembly.
17. Inspect filter. If very oily, replace filter. A very oily filter indicates a leaking air strut assembly.
18. Reverse procedure to install. The following air spring filling procedure must be performed as follows:
a. Disconnect battery ground cable.
b. Ensure air suspension service switch is in the ON position.
c. Turn ignition switch to the OFF position.
d. Install a suitable battery charger to reduce battery drain.
e. Open access door in LH luggage compartment trim panel to plug Star tester into air suspension diagnostic wiring harness connector.
f. The Star test button should be in the hold (up) position. With brake pedal depressed hard, turn ignition switch to the RUN position.
g. Depress Star test button so that it is in the TEST (down) position.
h. At this time the air suspension control module will start sending out spring fill selection codes to be displayed on the Star tester. These codes will be displayed in a scrolling manner.
i. Select the desired spring fill operation by releasing the Star button when the desired code is displayed (as described previously). As long as the Star tester button is released the desired operation (inflation or deflation) will continue. To stop a selected operation, depress the Star tester button back down to the Test position. At this time the spring fill codes will again be displayed in a scrolling manner. When installing deflated are springs, lower hoist as required but do not apply a load to the suspension until after the air spring has been inflated at least 60 seconds.
j. After completion of operation, exit the spring fill mode by disconnecting the Star tester and turning the ignition switch to the OFF position.