HC21 Vent Right Rear Spring

^ In order to determine if the air line or air compressor assembly is the problem the following actions are required:

^ Disconnect one of the air lines from the air compressor dryer assembly.

^ Release STAR test button so that it remains in the HOLD position after code 23 has been displayed for at least 5 seconds.

NOTE: This test step may result in a rapid loss of air from the air spring.

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

Very slowly or none at all -- DEPRESS STAR test button down so that it remains in the TEST position. SERVICE restriction in air line for right rear corner of vehicle. REPEAT Service Bay Diagnostics. Reading and Clearing Diagnostic Trouble Codes

NO -- DEPRESS STAR test button down so that it remains in the TEST position. Then GO to HC22.