The effect you are describing can be achieved if you remove power from the EAS ECU. There are a few ways to accomplish this. One popular and easy method is to unplug the EAS relay timer. This Tall relay, located under the same seat as the EAS, sends power to the EAS and sustains power to the EAS for self leveling operations after the car has been powered off.
The EAS relay is located under the outside edge of the seat with the EAS unit. The rubber mount holding the EAS relay can be unhooked and the entire unit can be routed forward towards the passengers feet. Allows easy reach under the seat access.
I have in the past, started the car with the Relay plugged in, set the ride height and then reached down and unplugged the relay. This will trigger the BECM "MAX 35 MPH" message but will not send the EAS into fault mode. Simply plugging the Relay back in will power up the EAS ECU and remove the BECM "MAX 35 MPH" message. Potentially good as it allows you to repair the EAS problem and keeps the EAS powered down during the fault situation.
Remember, if you have a major EAS failure and the EAS relay is unplugged, the Suspension will not drop to the Bump Stops. Potentially bad situation if one corner of the car is blown out and the other three are fully inflated and cruising on the highway at 80 mph. Although it will keep the EAS ECU from discovering the fault and give you a chance to repair the EAS fault before plugging the relay back in.
