Cruise Control With Braking Function (LDM)

Cruise Control With Braking Function (LDM)


NOTE:
In the E90\E91\E92, there are up to three various cruise control systems:
- Cruise control optional extra 540 (set speed is maintained by the engine)
- Cruise control with braking function optional extra 544 (set speed in addition to optional extra 540 is also implemented or maintained by brake intervention via the DSC)
- Active cruise control (ACC) optional extra 541(contains the functionality of optional extra 544 and additional distance control via the ACC sensor)

LDM control unit:
With optional equipment 544 (up to 09/06) and optional equipment 541 in the E90/E91/E92, the scope of functions of the software for cruise control is implemented in a separate control unit: the LDM control unit.
As of 09/06 or on the E92 with the series launch (06/06), the cruise control with braking function (optional extra 544) is integrated in the DSC control unit. The LDM control unit is therefore eliminated on optional extra 544 as of 09/06.
A precondition for the function is that the engine / transmission control and the DSC are operating without faults.