Circuit/System Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The electronic suspension control module (ESCM) commands the damper solenoid ON and OFF. When the solenoid is initially energized, the supply voltage is then pulse width modulated (PWM). The amount the solenoid is activated is based on inputs from the driver tow/haul switch, road inputs, position sensor inputs, and the powertrain control module (PCM). The ESCM continuously compares each dampers command state with the state of their feedback circuits to ensure they agree.