CTS 2006-2007, CTS-V 2005-2007, DTS 2006-2007

Air Suspension

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The air suspension system fully suspends the rear of the vehicle and maintains a desired rear suspension position during all types of hauling and loading conditions.

The air suspension system consists of the following items:



Air lines
 
Air suspension control module (ASCM
 
Air springs
 
Air suspension compressor sensor
 
Air suspension compressor relay
 
LR and RR suspension position sensor
 
Serial data circuits with data exchange to the Engine Control Module (ECM) and Body Control Module (BCM)
 

When the vehicle is unloaded, the rear suspension is at a desired position, which is monitored by the ASCM using its LR and RR position sensor signal voltage inputs. As weight is added to the rear of the vehicle, the rear suspension position changes thus changing the position sensor's signal voltage inputs. If the ASCM detects a steady constant change in position sensor signal voltage for at least 3 seconds, it responds by commanding on the compressor relay causing the air compressor to activate. Once the air compressor is activated, the ACSM opens the LR and RR air spring control valves, causing the rear air spring pressures to inflate. This inflation raises the rear of the vehicle to regain the desired suspension position. When weight is removed from the rear of the vehicle, the ASCM responds by commanding ON the exhaust valve and LR and RR air spring control valves, causing the air spring pressures to deflate. This deflation lowers the rear of the vehicle to regain the desired suspension position. The ASCM also monitors the engine run status from the ECM via the serial data circuit and will not allow compressor activity unless the engine is running to avoid battery run down.

 
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