Test H: The Air Compressor Continuously Cycles With The Ignition Switch In The Off Position and No DTC Is Set

Pinpoint Test H: The Air Compressor Continuously Cycles With the Ignition Switch in the OFF Position and No DTC is Set

Normal Operation
The vehicle dynamics module (VDM) will command the air compressor ON or OFF when certain conditions are met. The VDM supplies voltage to the air suspension compressor relay through circuit CCLO1 (WH/VT), which engages the relay and supplies fused battery voltage along circuit SBB39 (WH/RD) through the air compressor relay and then to the air compressor along circuit CCLO8 (BN/BU). The air compressor is supplied a ground along circuit GD123 (BK/GY) and the air compressor relay is supplied a ground along circuit GD123 (BK/GY).

This pinpoint test is intended to diagnose the following:
^ Wiring, terminals and connectors
^ Air compressor relay
^ VDM

H1-H2:

H2 (Continued)-H6: