Test K: The Air Compressor Is Inoperative

Pinpoint Test K: The Air Compressor is Inoperative
Refer to Vehicle/Diagrams, Vehicle Dynamic Suspension for schematic and connector information.

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:
^ Fuse(s)
^ Wiring, terminals and connectors
^ Air compressor relay
^ Air compressor
^ VDM

K1-K2:

K3-K4:

K4 (Continued)-K5:

K6-K8:

K8 (Continued)-K9: