Single-Axle Air Suspension EHC (EHC Electronic Height Control)

Height-Level Calibration EHC E39/E53/E65/E61
After work on the air suspension system involving the control module, correction values must be entered in the control unit. These correction values are determined and entered automatically in the control module in this test module after entering target and actual values for the E39 and E53 as well as after entering the rim size and actual values on the E65 and E61.

Service Functions
Height-level calibration must be carried out after the following operations:
- Replacement of the control module
- Replacement of one or both of the height-level sensors
- Replacement of the wiring harness

Before the height-level calibration is run, the following points must be observed:
- The vehicle must be in a horizontal position.
- The chassis must not be tensioned.
- The air suspension must have ceased operation (to be safe, switch the engine on and off).
- The supply must be ensured (check battery voltage).

During the height-level calibration, the vehicle must not be loaded or unloaded.

Before calibration, check the height once again.

The height-level calibration is run automatically after entering target and actual value (gap wheel house edge / rim flange at bottom).
The target values can be found in Alignment Specifications Ride Height. [1][2]Ride Height


After the height-level calibration, the assembly line mode is automatically deleted. Control operation starts with the engine running.