Active body control (ABC) function - GF32.50-P-0001A: Notes

MODEL 215, 220 with CODE (487a) Active body control (ABC) 

A  ctive B  ody C  ontrol is an active suspension and damping system. The complete static and dynamic supporting part is taken over by four spring struts located at the wheels. A dynamically adjustable hydraulic cylinder (plunger) is fitted in series with a coil spring and in parallel with a shock absorber. Through displacement the hydraulic cylinders produce forces which counteract the wheel movements.

ABC includes the following additional functions:

• The level adjuster  enables the vehicle level to be raised/ lowered manually and automatically depending on vehicle speed.
• The level control  controls the vehicle level at the front and rear axle according to the driving/load condition in each case and keeps it constant.

Advantages 

• Greater driving safety and ride comfort through:
  • Adaptation of suspension and damping to road quality and driving style.
  • Significantly improved comfort in terms of vibrations
  • Reduced vertical body movements due to road surface influences.
  • Reduce body roll and pitch motions
  • Lower air resistance and therefore lower fuel consumption
  • Less lift at the front axle
• Individual adaptation through:
  • Raising the vehicle level in 2 stages for poor road conditions or garage entrances.
  • Facility for adjusting 2 characteristics for a comfort-oriented or sporty driving style.
• Driver information through:
  • Display of the raised vehicle level stages and the sporty characteristic via warning lamps in the switches.
  • Warning of too low a vehicle level by the multifunction 82 of 233 display in the instrument cluster.

Function survey 

The corresponding functions of the hydraulic control circuits are controlled by the electrical/electronic components.

The ABC control module receives input signals from the following components:

• ETC control module (via CAN)
• ESP control module (via CAN)
• Engine control module (via CAN)
• DI control module (via CAN)
• Comfort and sport switch (via CAN)
• Level control switch (via CAN)
• Left front SAM control module (wake-up signal)
• 3 body acceleration sensors
• 2 front axle level sensors
• 2 rear axle level sensors
• 1 suspension strut motion sensor for each spring strut
• 1 pressure sensor
• 1 longitudinal acceleration sensor
• 1 lateral acceleration sensor
• 1 oil temperature sensor
• Voltage supply and ground

The input signals are processed into output signals for the following components in the ABC control module:

• 4 control valves
• 4 shut-off valves
• 1 suction restrictor valve
• Multifunction display in instrument cluster
• Indicator lamps in the switches: comfort and sport, level control

The ABC control module decides which control functions must be controlled based on the input signals.

	Active body control (ABC), driver information	Model 215	GF32.50-P-0001-03A
		Model 220	GF32.50-P-0001-03B
	Active body control (ABC), location of hydraulic components		GF32.50-P-0001-06A
	Active body control (ABC), location of electrical/electronic components		GF32.50-P-0001-07A
	CAN signal ABC control module		AD32.50-P-2000-04A
	Suspension and damping, function		GF32.50-P-2000A
	Level control, function		GF32.22-P-4005B
	ABC level adjustment, function	Model 215 except	GF32.50-P-4004A
		Model 215	GF32.50-P-4004B
		Model 220 except	GF32.50-P-4004C
		Model 220	GF32.50-P-4004D