System, Venting Or Filling
-- Connect Vehicle Diagnostic Tester and then perform vehicle-specific entry into Guided Fault Finding and select Go To button "function/component selection", refer to Vehicle Diagnostic Tester, CONNECTING AND SELECTING FUNCTIONS .
Then
-- "Chassis (Repair group 01; 40 - 49)"
-- "34 - Level control (Repair group 01: 43, 44)".
-- "01 - On Board Diagnostic (OBD) capable systems"
-- "J197 - Level control system control module functions".
-- "J197 - System venting or filling".