The earlier Range Rover 2002-2005 have no limits even if values entered are mechanically out of range. For safety reasons, we’ve implemented a limit of 200 mm in the EASControl and IIDTool on the raising side only. This limit is absolute therefore the relative height change depends on the actual sensors calibration and will vary on each vehicle.
When lowering, you can reach the bump stops but we suggest staying higher unless you want a bumpy ride. If set too low, the EAS ECU will never be able to reach its target. This will in turn prevent the ECU from shutting down thus draining the battery. In this case, the center console EAS light will keep flashing even if the vehicle electronics have shut down.
For other vehicles, Range Rover 2006 onwards, Range Rover Sport 2005 onwards and Discovery 3-4 / LR4, the EAS ECU accepts only values between 150 and 250.
Again, the actual maximums will depend on the sensors calibrations. For example, and to stay “not too technical”, here are the real limits found on a Range Rover Sport 2008 and Range Rover 2007 from the original calibration.
Range Rover Sport 2008
Raising max +33 mm
Theoretical lowering max -35 mm
Real lowering max -18 mm, this keeps the access height higher than the bump stops.
Theoretical Lowering max -35 mm
In this example, one can go as low as -35 mm from the original standard height. In which case, it would not be possible to select the access height because the vehicle would reach at least one of the bump stops. When a bump stop is reached, the EAS ECU believes the vehicle is grounded and activates the extended mode (the vehicle is raised higher than the off road height).
Real Lowering max -18 mm
If you want to keep using the access mode, -18 mm would be the maximum lowering of the standard height in this example. The vehicle will reach the bump stops when access height is selected with the standard height lowered more than 18 mm. This value was empirically found and will differ depending on the vehicle.
Range Rover 2007
Raising max +22mm
Lowering max -22mm
The Range Rover Sport height sensors positions are more comparable between the front and rear than on the Range Rover 2006-2009. This is why the range extent is wider.