HD17 Vent Left Rear Spring

^ To vent the left rear air spring the following action is required:

^ Release STAR test button so that it remains in the up HOLD position after code 27 has been displayed for at least 5 seconds.

NOTE: As long as STAR test button remains in the up HOLD position, the left rear air spring will continue to vent. When the desired amount of venting has occurred depress STAR test button so that it remains in the TEST position.

^ Left rear corner of vehicle has vented down to normal ride height:

Very slowly or none at all -- DEPRESS STAR test button down so that it remains in the TEST position. Then GO to HD18.

Slowly or at a normal rate -- If left rear corner of vehicle also has leveling problems service them first. Otherwise REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes If problem still occurs, INSTALL a new air suspension control module and then REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes