BMW Cruse Control types:
1 - SA540 Cruise Control - set speed is maintained by the engine
2 - SA544 Cruse Control with break function (LDM) - include curve speed limit, set speed in addition to SA540 is also implemented by break activation via the DSC
3 - S541A Active cruise control (ACC) - contains the functionality os SA544 and distance control via the ACC sensor
4 - S5DFA Active cruise control+Stop&Go function
At this post I am evaluating retrofit of option 1/2.
Having experience of retrofit ACC including home made calibration on VW group cars (Audi), reading Exx E7x and Fxx documentation and many different BMW forums it seems the following steps are required:
1. Replace - Steering Column Switch Cluster (SZL) with the one with lower steering column stalk for Cruise Control, as per
www.etk.cc/
Guess here are two variants:
- just add lower steering column stalk for Cruise Control
- replace the Steering Column Switch Cluster
make sure Coil Spring version supports Cruise Control signal as there are more signals transported over that unit (PT-CAN bus):
• Activation of driver airbag
• Control buttons SMG (being prepared)
• Multifunction buttons
• Horn
• Steering wheel heating
Then perform Steering Column Switch Cluster/Coil Spring – calibration – in case of unit replacement.
Some info here:
http://www.bmwmotorsports.org/pdf/e7...%20Cluster.pdf
2. Codding (with NCS Expert) SZL to allow PT-CAN data flow around ABS/Engine/CC Stalk/Kombi):
- change VO (Vehicle Ordered) by adding relevant future #540 or #541
- code KOMBI ( Instrument cluster to allow Crouse control display)
- code DSC-ABS (engine for #540, ABS pomp will be involved in case of #544 or #541 )
- code SZL - Steering Column Switch Cluster
I have a copy of my entire car coding and cannot find relevant TEMPOMAT / CRUISE line to modify
My CAS coding does contain:
CRUISE_CONTROL nicht_aktiv
CRUISE_CTRL nicht_aktiv
K4D03_ANZEIGE_TEMPOMAT par_gesperrt
CRUISE_CTRL_CCC nicht_aktiv
TEMPOMAT_SETZ_ANZ_DAUER wert_01 change set cruise control time on display "_01" in sec.
CRUISE_CTRL_CHAMP nicht_aktiv
But in KOMBI I cannot find any setting referring to Cruise/TMPOMAT three are only setting referring to ACC.
I found that in E7x SZL unit is now part of ABS-DSC – is that correct?
See attached original coding dump.
Anyone can help here?