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EHC System Operation

A fully functional EHC system is controlled by one of three different modes of operation. The operation mode is selected by the control module based on current conditions provid- ed by the monitored input signals. The main modes of operation are:

Pre-Run/Post-Run Mode



Normal Mode



Tailgate Mode

Two special operating modes are also included in the control module programming.

 New/replacement mode (pre ZCS encoded). This mode provides basic operation.  Transport Mode - Transport mode is set at the factory and raises the vehicle 30mm to

prevent vehicle damage during transportation. It must be deactivated with the DIS/ MoDiC prior to customer delivery.

Pre-Run/Post-Run Mode

The Pre-Run mode is activated when the vehicle is parked and the control module is in the sleep mode. Opening a door or the tailgate initiates a system wake up and the control mod- ule comes on-line.

The control module performs a self-check of the control electronics and sensors. If no fault is found, the system will check the ride height and institute a rapid regulation if the height varies by more than 40mm.

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