Vehicle Dynamics Control Module (VDM)

The VDM monitors all sensor inputs and all HS-CAN messages that relate to the vehicle dynamic suspension and then directly controls the valve solenoids. The VDM sends an individual electrical current to each valve solenoid to control the amount of damping required.

The VDM requires calibration when any of the following components is installed new, disassembled, disconnected or removed.

• VDM
• Suspension height sensor
• Rear Suspension height sensor
• Front upper control arm
• Front coil over shock assembly
• Rear upper control arm
• Rear lower control arm

The calibration procedure is carried out using the diagnostic scan tool and required for the system to learn the zero-position of the vehicle.

Before performing the calibration procedure:

• Be sure the vehicle is on a level surface.
• The vehicle must not be moving.
• No occupants in the vehicle.
• Make sure the suspension is in a neutral position if it was recently lowered. To neutralize the suspension, drive the vehicle a short distance, such as around a parking lot.

Activate the Engineering Test  mode for dynamic suspension which will power the shocks and allow the vehicle to settle by following the procedure below:

• Put the vehicle into Neutral
• Turn the vehicle ON with engine OFF
• Depress the gas pedal fully 3 times within 10 seconds, letting it fully return between each depression
• If the above sequence is correctly executed, a small

  ET  for

  Engineering Test  will display in the bottom right of the cluster and the shocks will power on (truck may also drop slightly).