BMW 740iL Reparaturanleitung PDF herunterladen (Seite 23)

Level Control Systems

Special Operating Modes

• Assembly Line Mode (New control module)

The assembly line mode refers to control module manufacturing. New control modules

are stored in a deactivated state. The control programming is not active and must first

be ZCS encoded.

After installing a replacement control module, it must be coded using the DIS or MoDiC.

The instrument cluster fault display will remain illuminated until the control module is

coded.

• Transport Mode

The vehicle rolls off the factory assembly line with the EHC control module in the trans-

port mode. The transport mode inflates the air springs to a higher position (approx.

30mm higher) than the normal mode in order to avoid damage during transit.

The system will not respond to any inputs that would alter the height of the vehicle. The

fault indicator (base cluster) is illuminated or instrument cluster matrix display (high clus-

ter) provides the message “Leveling System” to draw attention to the transport mode

setting.

The Service Functions section of the diagnosis program is used to activate/deactivate

the transport mode. Once the transport mode is deactivated, check the vehicle Ride

Height Offset making sure the vehicle rear axle height is to specification.

Control Interrupts

Cornering

To prevent unnecessary suspension adjustments while driving through corners, a “control

interrupt” is built into the system. Above 30MPH the control module monitors the left/right

ride height sensors for a difference of 30mm. Exceeding this difference will put the system

into a control interrupt and no adjustment will take place. The control interrupt last for a

duration of 5 minutes.

Vehicle Lifting

The ride height control is interrupted when the vehicle is raised on a lift or with a jack. The

system monitors the ride height sensor inputs and when the height limit of 90 mm is

exceeded, the control is switched OFF until the vehicle is lowered again.

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BMW 740iL Reparaturanleitung Seite 23