Steep inclines and/or heavy loads

ACC is primarily intended for use on fairly level roads. The system may have difficulty maintaining the correct distance to a vehicle ahead on steep inclines, if the vehicle is carrying a heavy load or is towing a trailer. In these situations, the driver should always be prepared to apply the brakes if necessary.
See also:
Automatic relocking
If the doors are unlocked, the locks will automatically reengage (re-lock) and
the alarm will rearm after 2 minutes unless a door or the trunk has been opened. ...
Other alarm-related functions
Automatic re-arming
If the doors are unlocked, the locks will automatically reengage (re-lock) and
the alarm will re-arm after 2 minutes unless a door or the trunk has been opened.
Audible/visual ...
Immobilizer (start inhibitor)
Each of the keys supplied with your vehicle
contains a coded transponder. The code in the
key is transmitted to an antenna in the ignition
slot where it is compared to the code stored in
the s ...
