GF32.33-D-2006H Electronic Level Control (ELC) In Driving Function

GF32.33-D-2006H Electronic Level Control (ELC) in Driving Function


- with CODE (CE2) Rear air suspension

Function requirements

^ Circuit 30
^ Circuit 15 ON
^ Circuit 61 ON
^ Passive/service or manual mode activated
^ Model 639: Vehicle speed > 2 km/h
^ Model 906: Vehicle speed > 10 km/h
^ No overvoltage or undervoltage

Overvoltage present when the voltage is > 16.2 V.

Undervoltage is present when voltage is < 9 V.

General

If the vehicle speed of 2 km/h (model 639) or 10 km/h (model 906) is exceeded, then the electronic level control (ELC [ENR]) system automatically switches to the automatic mode.

This does not apply when a fault is present, which deactivates the electronic level control system and switches to the passive/service mode.

The passive/service mode is indicated by permanent illumination of the ELC [ENR] warning lamp (A1e5) in the instrument cluster (A1) and permanent illumination of the indicator lamp in the lock level control switch (S77/1).

The "electronic level control (ELC [ENR]) when driving" function is made up of the following subfunctions:
^ Vehicle dynamics influence
^ Driving with impermissible level
^ Fault detection

Vehicle dynamics influence

The rear axle sagging and rebound caused during acceleration and deceleration is recognized by the electronic level control system and consequently not subsequently regulated. The same applies for any rolling of the vehicle when cornering. The rolling is also recognized here and the electronic level control system is not subsequently regulated.

Driving with impermissible level

In manual or passive/service mode the vehicle can be moved outside the upper permissible level (+40 mm) or the lower permissible level (-35 mm) (model 639 < 2 km/h, model 906 < 10 km/h).

In this instance, the electronic level control warning lamp in the instrument cluster starts to flash on and of quickly as of a vehicle speed of > 2 km/h (model 639) or > 10 km/h (model 906).

In the event of a defect (e.g. leaking air spring bellows) the vehicle can also be moved at a level that is too low (the vehicle touches the additional rubber spring integrated into each air spring bellows). Here, there may be some sporadic errors which lead to a visual feedback in the form of fast blinking of the electronic level control warning lamp in the instrument cluster.

Fault detection

The electronic level control system undergoes a regular system test during automotive operation. Any faults that occur here are classed as "Temporary (malfunctions)" or "Permanent" and then saved. If the fault or malfunction exerts an excessive influence on the electronic level control system, the electronic level control system is switched to the passive/service mode.

The passive/service mode is indicated by permanent illumination of the ELC [ENR] warning lamp in the instrument cluster and permanent illumination of the indicator lamp in the lock level control switch ().

If the vehicle's rear axle level drops below a specific value, the vehicle will then touch down on the additional rubber spring integrated into each air spring bellows. This then restricts the suspension comfort.