5 Series E60 M5 (S85) SAL
If an overvoltage or undervoltage is detected during continuous operation of the button for the electrically pivoted
trailer coupling, the ball head can still be pivoted into the limit position. The ball head's pivoting movement stops
when the button is released. The DC motor can then no longer be energised while the overvoltage or
undervoltage persists.
> E90, E91, E92, E93
The trailer coupling release control unit detects undervoltage and overvoltage.
Undervoltage On-board supply voltage less than 9 volts
Overvoltage On-board supply voltage greater than 15 volts
Outside this voltage range, the system is deactivated.
Overheating protection for drive
> E90, E91, E92, E93
The DC motor is actuated for a maximum of 4 seconds.
The control unit detects an excessively high current draw for the drive, e.g. due to blocking. The maximum
current draw is 13 amps.
Adjusting the trailer coupling
> E60, E61
To ensure that the trailer coupling remains pivoted in the limit position, the DC motor is energised briefly in the
direction of the limit stop every 60 seconds.
The control unit for the electrically pivoted trailer coupling activates adjustment in the following conditions:
•
Terminal 15 ON
•
Ball head pivoted out in limit position
Emergency function
> E60, E61
Cyclical readjustment of the pivoted-out ball head can result in the ball head becoming mechanically jammed in
this limit position.
In this event, the ball head can be freed from the limit stop by the emergency function.
A defined pivoting movement must be achieved in the run-up phase to pivoting the ball head out or in. This
pivoting movement corresponds to a defined number of Hall-effect pulses by the DC motor. The Hall-effect
pulses are picked up by a Hall-effect sensor on the DC motor.
If a defined number of Hall-effect pulses is not reached, the control unit activates the emergency function.
In the emergency function, the DC motor is energised five times cyclically (each cycle comprises energising for
300 ms followed by a pause of 200 ms).
If the minimum number of Hall-effect pulses is not achieved, the ball head can then only be pivoted in or out by
continuous operation of the button for the electrically pivoted trailer coupling.
The control unit for the electrically pivoted trailer coupling activates the emergency function in the following
conditions:
•
Briefly pressing (for less than 1 second) the button for the electrically pivoted trailer coupling (mode: fully
automatic pivoting out or in)
•
Trailer head is in the run-up phase to pivoting in or out
•
Emergency function was not previously triggered
•
Minimum number of Hall-effect pulses by the DC motor not achieved
SBT Electrically operated trailer coupling E60, E61, E90, E91, E92, E93
BMW AG - TIS
23.02.2013 20:42
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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